explanation blue bibcodes open ADS page with paths to full text
Author name code: bruning
ADS astronomy entries on 2022-09-14
author:"Bruning, David H."
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Title: Teaching Your First Astro 101 Course: What They Don't Tell You
Authors: Bruning, D.
2014ASPC..483...57B Altcode:
Designing your Astro 101 course should not be about what topics
you can omit but should be a thoughtful process that regards your
fundamental teaching goals and which topics and skills promote those
goals. Establishing goals and assessments that lead to measurable
student outcomes enable one to more constructively design a learning
experience for students. Just as any good novel has multiple story lines
that weave throughout the book, your course has several narratives that
wind through different topics and help to tie goals together. Sharing
this underlying organizational structure of your course with students
helps them to connect ideas and be more successful.
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Title: Learning and the Net Generation
Authors: Duncan, D. K.; Rudolph, A. L.; Bruning, D.
2014ASPC..483...47D Altcode:
Most instructors believe that GPA, ethnicity, native English speaking
ability, class year, family income, and whether parents have a
college degree are important indicators of student success in Astro
101. Research shows, however, that the single most important factor
in student learning is interactivity in the classroom. While <P />new
electronic media may have some important uses, research shows that
electronic device usage in the classroom by students can negatively
impact their course grades by as much five percent.
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Title: Tricks of the Trade: Effective Classroom Management (An Open
Microphone Session)
Authors: Slater, T.; Bruning, D.
2011ASPC..443...29S Altcode:
To close the Cosmos in the Classroom meeting, we want to share
effective ways to help our students (and ourselves) to succeed in our
classes, by setting the right course guidelines about in-class and
out-of-class behavior. What ways of helping students to become adult
learners and responsible members of the college community have been
most effective for you? What have you learned from colleagues in your
and other disciplines that could help everyone at the session work
with 21st century students in our evolving universe of classroom and
home technology?
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Title: Differential Rotation in Solar-type Spectra
Authors: Bruning, David H.
2009AAS...21443302B Altcode:
A continuing effort has developed a disk-integration model to study
the effects of differential rotation and surface convection in the
spectrum of sun-like stars (e.g., BAAS 38, 915, 2007; BAAS 40, 203,
2008). This poster extends the analysis to fast and slow rotators
(previously limited v sin i from 2 to 6 km/s), a larger range in
inclination, and non-solar convective line shifts. The pseudo-power
spectrum is explored further as a diagnostic tool.
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Title: Readability Analysis of Introductory Astronomy Textbooks
Authors: Bruning, David H.
2008AAS...212.4006B Altcode: 2008BAAS...40Q.241B
Increasingly, first-year students have reading deficiencies and do
not have the academic discipline to read introductory textbooks. Few
students have the skills needed to organize ideas elicited from texts,
and even fewer seem capable of evaluating ideas and concepts as to
importance. While the amount of pedagogical support has increased
in introductory astronomy texts in recent years, it is worthwhile to
investigate how the readability of these books has changed with time. <P
/>Dukes and co-authors (1979, 1980, 1983) surveyed numerous introductory
astronomy textbooks using the Flesch Readability index. For a direct
comparison to Dukes' work, I have used Flesch's index to survey three
groups of introductory astronomy texts. Group I samples editions from
Dukes' surveys to normalize the current survey and to provide a text
baseline from 25 years ago, while group II includes texts from the 1940s
and 1950s and group III current texts to compare the readability of
present texts with those from previous decades. <P />At first glance,
this study indicates that texts have not changed in readability
over the past several decades. However, other issues arise when the
results are investigated in detail. Flesch measures readability but not
understandability; understandability may have changed. Reading load
has increased as texts have increased in size from 478 to 605 pages,
on average. While texts may have a grade 11-12 reading level, that is
an average and parts of texts soar to post-graduate reading levels;
the ups and downs may affect student comprehension. Readability is
just one measure for analyzing texts and these other issues may be
more important for judging why our students have difficulty reading
introductory astronomy books.
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Title: Signatures of Differential Rotation in Solar-type Spectra
Authors: Bruning, David H.
2008AAS...212.1101B Altcode: 2008BAAS...40..203B
Bruning (BAAS 38, 915, 2007) reported on the effects of surface
convection on the Fourier signal of differential rotation in the solar
spectrum. The Fourier signal of medium-strength lines is not well
matched unless the effects of surface convection are included. This
paper extends the analysis to a range of parameters such as v sin
i, limb darkening, amount of differential rotation, and convective
shifts. This grid of models should help establish for observers
whether differential rotation is discernible in late-type stellar
spectra. <P />This work was supported in part by the Wisconsin Space
Grant Consortium.
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Title: Signatures of Differential Rotation in Solar-type Spectra
Authors: Bruning, David H.
2007AAS...21110304B Altcode: 2007BAAS...39Q.920B
Bruning (BAAS 38,915,2007) reported on the effects of surface
convection on the Fourier signal of differential rotation in the solar
spectrum. This paper extends the analysis to a range of parameters
such as v sin i, limb darkening, amount of differential rotation,
and convective shifts. This grid of models should help establish for
observers whether differential rotation is discernible in late-type
stellar spectra. <P />This work was supported in part by the Wisconsin
Space Grant Consortium.
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Title: Survey of Introductory Astrophysics Textbooks
Authors: Bruning, David
2007AEdRv...6...80B Altcode:
No abstract at ADS
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Title: Survey of Introductory Astrophysics Textbooks
Authors: Bruning, David
2007AEdRv...6a..80B Altcode:
Although Bruning has produced a series of textbook surveys for
introductory astronomy for non science majors, the present survey
is the first to examine introductory astrophysics books intended
for astronomy majors. It provides information about 21 introductory
astrophysics textbooks: nine broad topic texts, two on techniques,
three on the Solar System, one on galaxies and cosmology, and six on
stars. A set of seven tables indicates prices, page counts by topics,
pedagogical features of the text, appendixes, and text Web sites to
help instructors narrow the list of textbooks for closer inspection
as they make adoption decisions.
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Title: SABER: The Searchable Annotated Bibliography of Education
Research in Astronomy
Authors: Bruning, David H.; Bailey, J. M.; Brissenden, G.
2006AAS...20921302B Altcode: 2006BAAS...38.1194B
Starting a new research project in astronomy education is hard because
the literature is scattered throughout many journals. Relevant astronomy
education research may be in psychology journals, science education
journals, physics education journals, or even in science journals
themselves. Tracking the vast realm of literature is difficult,
especially since libraries do not carry many of these journals
and related abstracting services. <P />SABER is an online resource
(http://astronomy.uwp.edu/saber/) that was started in 2001 specifically
to reduce this “scatter” by compiling into one place an annotated
bibliography of relevant education research articles. The database
now includes more than 150 articles specifically addressing astronomy
education research. Visit SABER and see what it can do for you.
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Title: Differential Rotation in Solar-type Stars
Authors: Bruning, David H.
2006AAS...209.1402B Altcode: 2006BAAS...38..915B
Stellar dynamos require differential rotation. Recent observations by
Reiners (A&A 446, 267, 2006) showed the presence of differential
rotation in 28 of 147 stars of spectral type F and hotter. Yet,
the observational signature of differential rotation in solar-type
stars remains elusive, largely because of the smaller magnitude of
differential rotation in cooler stars. This paper looks at the effect
of surface convection on the Fourier signal of differential rotation
and seeks the known signature of differential rotation in the solar
flux spectrum. <P />This research has been supported in part by the
Wisconsin Space Grant Consortium.
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Title: SABER: The Searchable Annotated Bibliography of Education
Research in Astronomy
Authors: Bruning, David; Bailey, Janelle M.; Brissenden, Gina
2006AEdRv...5..177B Altcode:
No abstract at ADS
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Title: Survey of Introductory Astronomy Textbooks: An Update
Authors: Bruning, David
2006AEdRv...5..182B Altcode:
No abstract at ADS
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Title: Education Matters: Practicing What We Preach
Authors: Bruning, David
2006Mercu..35b..11B Altcode:
No abstract at ADS
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Title: 2006 Survey of Introductory Astronomy Textbooks
Authors: Bruning, David
2006AEdRv...4b...5B Altcode:
Keeping track of current astronomy textbooks is never easy. New editions
come frequently, and occasionally books are discontinued. Ancillary
materials and publisher Web sites change as well. This survey of
introductory astronomy textbooks is intended to help college instructors
of "Astronomy 101" select the text for their course. This survey
tabulates prices, page counts by topics, pedagogical features of the
text, appendixes, Web sites for the texts, and ancillary materials to
help instructors narrow the list of textbooks for closer inspection as
they make adoption decisions. For instructors who want to try something
different, perhaps for a special topics class or a shortened semester,
a list of alternative texts is included.
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Title: Survey of Introductory Astronomy Textbooks: An Update
Authors: Bruning, David
2006AEdRv...5b.182B Altcode:
The "2006 Survey of Introductory Astronomy Textbooks" had some
inconsistencies and incompleteness in the tables for ancillary and
supplementary materials. This update includes revision of those tables
plus updated entries for 10 of the two dozen textbooks surveyed.
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Title: SABER: The Searchable Annotated Bibliography of Education
Research in Astronomy
Authors: Bruning, David; Bailey, Janelle M.; Brissenden, Gina
2006AEdRv...5b.177B Altcode:
Starting a new research project can be a challenge, but especially so in
education research because the literature is scattered throughout many
journals. Relevant astronomy education research may be in psychology
journals, science education journals, physics education journals,
or even in science journals. Tracking the vast realm of literature is
difficult, especially because libraries frequently do not subscribe
to many of the relevant journals and abstracting services. The
Searchable Annotated Bibliography of Education Research (SABER) is an
online resource that was started to service the needs of the astronomy
education community, specifically to reduce this "scatter" by compiling
an annotated bibliography of education research articles in one
electronic location. Although SABER started in 2001, the database has
a new URL—<A href="http://astronomy.uwp.edu/saber/">http://astronom-
y.uwp.edu/saber/</A>—and has recently undergone a major update.
---------------------------------------------------------
Title: 2006 Survey of Introductory Astronomy Textbooks
Authors: Bruning, David
2006AEdRv...4b..54B Altcode: 2005AEdRv...4b..54B
Keeping track of current astronomy textbooks is never easy. New editions
come frequently, and occasionally books are discontinued. Ancillary
materials and publisher Web sites change as well. This survey of
introductory astronomy textbooks is intended to help college instructors
of "Astronomy 101" select the text for their course. This survey
tabulates prices, page counts by topics, pedagogical features of the
text, appendixes, Web sites for the texts, and ancillary materials to
help instructors narrow the list of textbooks for closer inspection as
they make adoption decisions. For instructors who want to try something
different, perhaps for a special topics class or a shortened semester,
a list of alternative texts is included.
---------------------------------------------------------
Title: Education Matters, What Is It We Teach
Authors: Bruning, David
2006Mercu..35a..11B Altcode:
No abstract at ADS
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Title: Assessing Thinking Skills in Astro 101: Do We Make an Impact?
Authors: Bruning, D.
2005AAS...207.2701B Altcode: 2005BAAS...37.1208B
Most instructors agree that a major goal of "Astronomy 101" is to
develop thinking skills in our students (Partridge and Greenstein, AER
2, 46, 2003). Much educational research in astronomy has initially
concentrated on "best practices" for improving student learning
(development of "think-pair-share", lecture tutorials, peer tutoring,
etc.). Little has been done to date to assess our efforts to improve
student thinking skills and students' desire to think more deeply
about the cognitively rich ideas offered in the typical astronomy
class. <P />This study surveys several astronomy and physics courses
to determine whether general analytical thinking skills increase
because of the science course and whether students' attitudes toward
cognition improve. Cacioppo, Petty and Kao's "Need for Cognition"
scale is used for the latter assessment (J. Personality Assessment 48,
306, 1984). A shortened version of Whimbey and Lochhead's ASI skills
instrument is used to assess analytical skills ("Problem Solving and
Comprehension," 1986). <P />Preliminary results suggest that students
need for cognition does not change in general, although there may be
a correlation between increasing need for cognition and improvement
in grades through the semester. There is a suggestion that need for
cognition is slightly predictive of course performance, but a greater
correlation exists between the post-course survey and grades. Gains
in general analytical skills have been seen in initial surveys, but
correlations with course performance appear elusive.
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Title: 2006 Survey of Introductory Astronomy Textbooks
Authors: Bruning, David
2005AEdRv...4...54B Altcode:
No abstract at ADS
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Title: Education Matters: Confessions of an Astronomy Heretic
Authors: Bruning, David
2005Mercu..34e..11B Altcode:
No abstract at ADS
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Title: SABER: A Searchable Annotated Bibliography of Education
Research in Astronomy
Authors: Brissenden, G.; Bruning, D. H.; Slater, T. F.
2002AAS...200.1301B Altcode: 2002BAAS...34..660B
One of the greatest challenges in surveying the existing literature
in astronomy education research is that it is spread across tens of
journals. Currently, astronomy education research articles appear in
the journals primarily servicing science education, science teaching,
teacher education, curriculum and instruction, cognitive science,
and informal education. Indeed, it is this lack of a central place
for publishing the results of astronomy education research that has
motivated, in part, the creation of the new electronic astronomy
education journal, Astronomy Education Review (AER). In a concerted
effort to collect, summarize, and make more accessible the widely
dispersed knowledge-base of astronomy education research, members
of the AAS Working Group on Astronomy Education have volunteered to
sift through 35 journals and identify all articles from 1970 to the
present that are relevant to astronomy education. For our purposes,
relevant astronomy education research articles are those refereed
papers that describe quantitative and qualitative research methods
and results about teaching, learning, and assessment in astronomy
and space science. The group has collaboratively created an annotated
bibliography that summarizes these articles in an online database that
is electronically searchable. Here we present the annotated bibliography
to the astronomical community, provide additional background information
on its contents, and give information on how to access the database
online. Initial funding for the programming and design of the search
engine was provided, in part, by the Wisconsin Space Grant Consortium
and the American Astronomical Society.
---------------------------------------------------------
Title: 2002 Survey of Introductory Astronomy Textbooks
Authors: Bruning, David
2002AEdRv...1a..92B Altcode:
This is the fourth annual survey of introductory astronomy textbooks,
started in 1997. This guide is intended to help college instructors
of Astronomy 101 select the text for their course.
---------------------------------------------------------
Title: Development of a Comprehensive Online Annotated Bibliography
of Astronomy Education Research
Authors: Brissenden, G.; Bruning, D. H.; Slater, T. F.
2001AAS...199.4804B Altcode: 2001BAAS...33.1371B
One of the greatest challenges in surveying the existing literature
in astronomy education research is that it is spread across tens of
journals. Currently, astronomy education research articles appear in
the journals primarily servicing science education, science teaching,
teacher education, curriculum and instruction, cognitive science,
and informal education. Indeed, it is this lack of a central place
for publishing the results of astronomy education research that
has motivated, in part, the creation of a new electronic astronomy
education journal, Astronomy Education Review (AER). In a concerted
effort to collect, summarize, and make more accessible the widely
dispersed knowledge-base of astronomy education research, members
of the AAS Working Group on Astronomy Education have volunteered to
sift through 35 journals and identify all articles from 1970 to the
present that are relevant to astronomy education. For our purposes,
relevant astronomy education research articles are those refereed
papers that describe quantitative and qualitative research methods
and results about teaching, learning, and assessment in astronomy
and space science. The group has collaboratively created an annotated
bibliography that summarizes these articles in an online database that
is electronically searchable. Here we present the annotated bibliography
to the astronomical community, provide additional background information
on its contents, and give information on how to access the database
online. Initial funding for the programming and design of the search
engine was provided, in part, by the Wisconsin Space Grant Consortium
and the American Astronomical Society.
---------------------------------------------------------
Title: 2002 Survey of Introductory Astronomy Textbooks
Authors: Bruning, David
2001AEdRv...1...92B Altcode:
No abstract at ADS
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Title: Stellar graveyard.
Authors: Bruning, D.
1996Ast....24...44B Altcode:
Hubble Space Telescope has found dozens of burned-out stars in the
globular cluster M4.
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Title: Students in cyberspace.
Authors: Bruning, D.
1995Ast....23...48B Altcode:
Telescopes, planetaria, museums, and even NASA are just a mouse-click
away from teachers and pupils in the high-tech classrooms of the '90s.
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Title: Sunrise on the Moon.
Authors: Bruning, D.; Talcott, R.
1995Ast....23R..76B Altcode:
Simple astronomical computing can tell where the Sun is rising on the
Moon, throwing lunar features into sharp relief.
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Title: Astronomy's future: Dusk or dawn?
Authors: Bruning, D.
1995Ast....23...40B Altcode:
With money quickly drying up, astronomers face tough choices on what
telescopes to keep open.
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Title: Blasting along the InfoBahn.
Authors: Bruning, D.
1995Ast....23...74B Altcode:
A guide to Internet for armchair and backyard astronomers.
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Title: Mission to planet Earth.
Authors: Bruning, D.
1995Ast....23Q..44B Altcode:
Radar images from space are used to study changes in structures on
Earth's surface.
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Title: A galaxy of news.
Authors: Bruning, D.
1995Ast....23f..40B Altcode:
Latest surprises from ground and space are presented.
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Title: Build your own 10-inch PortaScope. Part 1.
Authors: Bruning, D.
1995Ast....23...80B Altcode:
The author gives step-by-step instructions for building a mid-sized
scope that breaks apart for easy transport.
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Title: Astronomy books for kids.
Authors: Bruning, D.
1994Ast....22...78B Altcode:
No abstract at ADS
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Title: Test your scope's optics.
Authors: Bruning, D.
1994Ast....22...56B Altcode:
The author gives a help how to use a star at night - or an easy-to-build
artificial star - to evaluate the performance of your telescope.
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Title: Clementine maps the Moon.
Authors: Bruning, D.
1994Ast....22R..36B Altcode:
New images from the Clementine spacecraft are helping astronomers
construct the first accurate map of the Moon's surface and its
mineralogy.
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Title: All eyes on the comet crash.
Authors: Bruning, D.
1994Ast....22...40B Altcode:
Comet 1993e Shoemaker-Levy 9 is beeing expected to smash into Jupiter.
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Title: Hubble better than new.
Authors: Bruning, D.
1994Ast....22d..44B Altcode:
Hubble's vision is sharper than anyone dared hope.
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Title: Fixing Hubble. NASA sends in the repair crew.
Authors: Bruning, D.
1994Ast....22Q..36B Altcode:
No abstract at ADS
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Title: November's Colorful Eclipse
Authors: Bruning, D.
1994Ast....22d..68B Altcode:
No abstract at ADS
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Title: The many faces of planetary nebulae.
Authors: Bruning, D.
1994Ast....22...94B Altcode:
The author presents photographs of planetary nebulae which could be
observed with small or medium-sized telescopes.
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Title: Charting a path through the night sky.
Authors: Bruning, D.
1993Ast....21...74B Altcode:
Observing guides, observing handbooks, almanacs, and atlases for the
amateur astronomer are presented.
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Title: Neon nova.
Authors: Bruning, D.
1993Ast....21g..36B Altcode:
No abstract at ADS
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Title: Seeing a star's surface.
Authors: Bruning, D.
1993Ast....21j..34B Altcode:
Astronomers use a star's rotation to unveil its features like starspots,
magnetic fields, and other stellar activity.
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Title: Lost and found: pulsar planets.
Authors: Bruning, D.
1992Ast....20f..36B Altcode:
No abstract at ADS
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Title: Three nights on Kitt Peak.
Authors: Bruning, D.
1992Ast....20d..38B Altcode:
No abstract at ADS
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Title: Desperately seeking Jupiters.
Authors: Bruning, D.
1992Ast....20...36B Altcode:
Planets should be a natural by-product of the formation of single
stars. But in spite of intensive searching, astronomers have yet to
find planets around Sun-like stars.
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Title: One Day on the Sun
Authors: Bruning, D.
1992Ast....20...48B Altcode:
No abstract at ADS
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Title: Determining the Earth-Moon distance
Authors: Bruning, David H.
1991AmJPh..59..850B Altcode:
No abstract at ADS
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Title: Mean Magnetic Field as a Tracer of Differential Rotation in
Late-Type Dwarfs
Authors: Bruning, David H.
1991PASP..103..368B Altcode:
Subsets of the solar mean-magnetic-field measurements have been studied
to determine the conditions for which a solar-type differential rotation
signal may be seen in stellar observations. Stellar differential
rotation may be detected from mean-magnetic-field measurements if: (1)
the number of observations is relatively high; (2) the noise level is
less than roughly 25 percent of the maximum field strength value; and
(3) the sign of the magnetic field has been determined. The combination
of synoptic polarization measurements with those of Zeeman broadening
may permit the detection of stellar differential rotation.
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Title: Line Asymmetries in G and K Dwarfs - Dependence on Spectral
Type and Activity
Authors: Saar, Steven H.; Bruning, David H.
1990ASPC....9..168S Altcode: 1990csss....6..168S
Observations of photospheric line asymmetries in 12 G and 11 K dwarfs,
particularly the Fe I 6151.62 A line, are examined to determine the
amplitudes and shapes of the bisectors. Bisector shapes are compared
for magnetically inactive and active stars, and correlations between
the slope and the stellar angular velocity are investigated. G stars
have increasingly negative slopes with larger stellar angular velocity
while K-star slopes become more positive, an effect which is shown to
be consistent with recent hydrodynamical models.
---------------------------------------------------------
Title: Rotational Enhancement of Line Asymmetries in F9-G2 Dwarfs
Authors: Bruning, David H.; Saar, Steven H.
1990ASPC....9..165B Altcode: 1990csss....6..165B
Disk integration of solar intensity profiles suggests that rotation
enhances intermediate strength line asymmetries up to v sin i of
about 6 km/s, after which the slope of the line bisector remains
constant. Observed stellar line profiles do not show such a simple
relation. Fast rotators exhibit large variations, owing presumably to
stellar activity. Caution is advised with respect to the use of slow
rotating or inactive star line profiles to determine the broadening
of faster rotators.
---------------------------------------------------------
Title: Line Asymmetries in G and K Dwarfs
Authors: Bruning, D. H.; Saar, S. H.
1989BAAS...21.1116B Altcode:
No abstract at ADS
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Title: Line Asymmetries in Late-Type Dwarf Photospheres
Authors: Bruning, D. H.; Saar, S. H.
1989ASIC..263..145B Altcode: 1989ssg..conf..145B
No abstract at ADS
---------------------------------------------------------
Title: Mass and Energy Flow Near Sunspots - Part Two
Authors: Nye, Alan; Bruning, David; Labonte, Barry J.
1988SoPh..115..251N Altcode:
Sunspots block the flow of energy to the solar surface. The blocked
energy heats the volume beneath the spot, producing a pressure excess
which drives an outflow of mass. Linear numerical models of the mass and
energy flow around spots were constructed to estimate the predictions
of this physical picture against the observed properties of sunspot
bright rings and moat flows. The width of the bright ring and moat
are predicted to be proportional to the depth of the spot penumbra,
in conflict with the observed proportionally of the moat width to the
spot diameter. Postulating that spot depths are proportional to spot
diameters would bury the moat flow too deeply to be observed, because
the radial velocity at the surface is found to be inversely proportional
to the depth of the spot penumbra. The radial velocity at the surface is
of order a few hundred meters per second after 1 day, in agreement with
the observed excess of moat velocities over supergranule velocities.
---------------------------------------------------------
Title: Spectral Line Asymmetries in Late-type Dwarf Photospheres
Authors: Bruning, D. H.; Saar, S. H.
1988BAAS...20..696B Altcode:
No abstract at ADS
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Title: Magnetic Fields on K and M Dwarfs
Authors: Bruning, David H.; Chenoweth, Richard E.; Marcy, Geoffrey W.
1987LNP...291...36B Altcode: 1987csss....5...36B; 1987LNP87.291...36B
Of seven late K and early M dwarfs, six were observed to have magnetic
fields. No relationship was seen between effective temperature and
either field strength or filling factor. Magnetic flux was observed
not to be constant over this range of effective temperature.
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Title: Stellar Differential Rotation - A Solar Analog
Authors: Bruning, D. H.
1986BAAS...18..981B Altcode:
No abstract at ADS
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Title: Sunspot Blocking and Energy Storage in the Convection Zone
Authors: Nye, A. H.; Labonte, B. J.; Bruning, D. H.
1985BAAS...17..895N Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Variations of the Asymmetry of Disk Integrated Solar Line
Profiles
Authors: Bruning, D. H.; Labonte, B.
1985SoPh...97....1B Altcode:
Mean line bisector positions were found for the neutral iron line at
γ 5250.2 using disk-integrated sunlight. After correction for the
apparent time variation of the instrumental profile, it was found
that the mean bisector position was constant during the period from
May 1982 to February 1983.
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Title: Heat and Mass Flow Around Sunspots
Authors: Bruning, D. H.; Labonte, B. J.
1985BAAS...17Q.611B Altcode:
No abstract at ADS
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Title: The applicability of the Fourier convolution theorem to the
analysis of late-type stellar spectra
Authors: Bruning, D. H.
1984ApJ...281..830B Altcode:
It is shown using observed solar flux and intensity line profiles
that explicit disk integration is more accurate than the Fourier
convolution method for the analysis of late-type stellar spectra. The
convolution method systematically underestimates or overestimates the
line broadening depending upon line strength and incorrectly estimates
the line depth. This failure of the convolution method is due to the
center-to-limb variation of the line shape across the stellar disk. It
is shown, however, that the convolution method is an appropriate
approximation for analyzing the spectra of fast rotators as long as
rotation is the dominant line-broadening mechanism. Rotational zeros
were found for two weak lines leading to a solar rotational velocity
of 1.85 + or - 0.1 km/s. These zeros are not visible unless the
signal-to-noise ratio is greater than 1000, demonstrating the extreme
difficulty of obtaining unique rotational signals from line-profile
analysis of late-type stars.
---------------------------------------------------------
Title: Magnetic field observations of evolved stars.
Authors: Marcy, G. W.; Bruning, D. H.
1984ApJ...281..286M Altcode:
A search has been made for Zeeman broadening in high resolution spectra
of eight G and K type, evolved stars which have active chromospheres
and coronae. No Zeeman broadening was found. It is likely that
the fraction of the stellar surface that contains magnetic fields
is similar in active giants and dwarfs, based on their comparable
chromospheric line strengths and plage surface brightnesses (deduced
from Mg II/C IV ratios) and on their comparable requirements for
coronal confinement. Thus, since Zeeman broadening is detectable on
active dwarfs, the nondetections of Zeeman broadening on these evolved
stars are probably due to systematically lower field strengths. That
the lower field strengths do not result in lower chromospheric surface
brightnesses on giants is consistent with the theoretial 'slow mode'
MHD wave generation rates of Ulmschneider and Stein (1982). The low
field strengths can be explained by requiring that the fields be in
equipartition with either the thermal or turbulent energy densities,
both of which are reduced in late-type evolved stars compared with
the sun.
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Title: Solar Line Asymmetry Variations
Authors: Bruning, D. H.
1984BAAS...16..730B Altcode:
No abstract at ADS
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Title: Limb darkening variations.
Authors: Bruning, D. H.
1984NASCP2310..165B Altcode: 1984siva.work..165B
Variations of the solar limb darkening as measured in the line
wing of the Fe I line at λ5250 have been observed at Mount Wilson
Observatory. The measurements were made over the visible solar disk
excluding those points where the magnetic field strength exceeded 5
Gauss. This exclusion of magnetic points should reduce the effects
of faculae upon the derived limb darkening curve. The observations
cover 160 days during 1980 and show evidence of variations of 0.002
I<SUB>0</SUB> over timescales of thirty days.
---------------------------------------------------------
Title: Solar irradiance variations on active region time
scales. Proceedingsof a workshop held at the California Institute
of Technology, Pasadena, California, June 20 - 21, 1983.
Authors: Labonte, B. J.; Chapman, G. A.; Hudson, H. S.; Willson,
R. C.; Newkirk, G. A., Jr.; Bruning, D. H.
1984sivo.book.....L Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Integrated Light Observations of the Asymmetry of the
λ5250 Line
Authors: Bruning, D. H.; Labonte, B. J.
1984ssdp.conf..338B Altcode:
A search for temporal variations in the asymmetry of the Fe I λ5250
solar flux profile has been started at Mount Wilson Observatory. A
preliminary analysis has indicated that the mean line bisector
position has shifted towards the red by 0.2 mÅ from May to December
of 1982. This is aproximately the shift expected if one extrapolates
the shift seen by Livingston from May 1980 to September 1981.
