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Author name code: redman
ADS astronomy entries on 2022-09-14
author:"Redman, Roderick Oliver" year:1910-1977
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Title: Mass transfer in the symbiotic binary AG Pegasi.
Authors: Hutchings, J. B.; Cowley, A. P.; Redman, R. O.
1975ApJ...201..404H Altcode:
Line profiles, equivalent widths, and radial velocities have been
derived from high-dispersion spectra of the symbiotic star AG Peg. The
model suggested from recent spectra is a hot, approximately 1 M0
subluminous star orbiting a 3 M0 giant. The hot object rotates rapidly
and ejects material which streams toward the cool primary. A bright
region near the substellar point on the M star is responsible for a
0.3 mag light variation, and is heated either by radiation from the hot
star or by collisions from the impinging stream. It is found that the
size of the emission nebula surrounding the hot object has decreased,
while its excitation has increased, since Merrill's observations several
decades ago. At the same time, the stream density appears to have
increased. An expanding, low-density envelope surrounds the system. The
exact orbital period remains uncertain because of complications in the
interpretation of the velocities from several regions, but a value of
820d is adopted. The system is thought to be in a late stage of its
evolution, but it is not clear what forces (perhaps magnetic?) drive
the stream, since the stars are well separated. Subject headings:
binaries - combination spectra - mass loss - stars, individual
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Title: Binary O star HR 8281.
Authors: Crampton, D.; Redman, R. O.
1975AJ.....80..454C Altcode:
No abstract at ADS
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Title: Spectroscopic investigation of X Persei (= 2U 0352+30?).
Authors: Hutchings, J. B.; Crampton, D.; Redman, R. O.
1975MNRAS.170..313H Altcode:
Radial velocity and line intensity measurements are reported from recent
high dispersion spectrograms of X Persei. The binary interpretation of
the previously reported s8o-day periodicity is discussed and revised
orbital para1neters are presented. Line intensity changes occur but
are not found to be correlated with this cycle. Rapid line profile
changes have been observed with an Image Isocon camera. The emission
line profiles are discussed in terms of binary model.
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Title: Evidence for the Existence of a Massive Companion to X Persei
(=2U 0352+30?)
Authors: Hutchings, J. B.; Cowley, A. P.; Cramption, D.; Redman, R. O.
1974ApJ...191L.101H Altcode:
Radial-velocity measurements of X Persei of spectra obtained from 1920
to 1974 reveal a probable periodicity of about 584 days. The broad
Balmer absorption lines and the emission peaks move in antiphase and
suggest the existence of a companion of mass at least 30 M0. Si bjert
headings: Be stars - binaries - massive stars - X-ray sources
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Title: The Galactic Distribution of H II Regions.
Authors: Crampton, D.; Redman, R. O.
1974BAAS....6..345C Altcode:
No abstract at ADS
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Title: Cambridge Observatories. Report for the year ending 1972
September 30.
Authors: Redman, R. O.
1973QJRAS..14..199R Altcode:
No abstract at ADS
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Title: HD 173219. A periodic Be star.
Authors: Hutchings, J. B.; Redman, R. O.
1973MNRAS.163..219H Altcode:
Spectroscopic observations at high dispersion are reported which reveal
a period of days in the large velocity variations of this star. Velocity
amplitudes derived from different lines vary widely, but the other
orbital elements agree well. The spectrum has numerous peculiarities,
some of which appear to change with phase. The main features suggest
a spectral type of B2 Ib. Possible shell configurations are discussed
and it is speculated that the invisible high mass companion may be a
black hole.
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Title: HD 187399: a binary with case B mass-exchange?
Authors: Hutchings, J. B.; Redman, R. O.
1973MNRAS.163..209H Altcode:
Recent coude' spectroscopy of HD 187399 is reported and the orbital
elements of the single-lined binary redetermined. It is suggested that
the primary fills its Roche lobe and loses mass at periastron, and that
the system corresponds to a case B of mass-exchange. The secondary
appears to be more massive and observationally undetectable. The
possibility of its being a black hole is discussed.
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Title: Cambridge Observatories. Report for the year ending 1971
September 30.
Authors: Redman, R. O.
1972QJRAS..13..436R Altcode:
No abstract at ADS
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Title: Pec
Authors: Redman, R. O.
1971QJRAS..12...39R Altcode:
No abstract at ADS
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Title: Cambridge Observatories. Report for the year ending 1970
September 30.
Authors: Redman, R. O.
1971QJRAS..12...76R Altcode:
No abstract at ADS
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Title: University of Cambridge. Report of the Observatories Syndicate
for the year ending 1970 September 30.
Authors: Redman, R. O.
1971ucro.book.....R Altcode:
No abstract at ADS
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Title: Cambridge Observatories. Report for the year ending 1969
September 30.
Authors: Redman, R. O.
1970QJRAS..11..255R Altcode:
No abstract at ADS
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Title: University of Cambridge. Report of the Observatories Syndicate
for the year ending 1969 September 30.
Authors: Redman, R. O.
1970ucro.book.....R Altcode:
No abstract at ADS
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Title: Cambridge Observatories. Report for the year ending 1968
September 30.
Authors: Redman, R. O.
1969QJRAS..10..134R Altcode:
No abstract at ADS
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Title: Coma tolerances for photographic star images
Authors: Linfoot, E. H.; Redman, R. O.
1968MNRAS.139..347L Altcode:
The question of alignment tolerances in large Cassegrain-type
telescopes led us to consider the problem: how much coma can be
tolerated in photographic star images intended for high-accuracy
positional astronomy? In the present paper this problem is attacked
computationally for a 150-in. Ritchey-Chretien telescope with a
50-in. secondary mirror. A star image, distorted by coma, possible focus
error and astigmatism, blurred by seeing spread, and superposed on a
uniform sky background, is received on a model photographic emulsion
of specified characteristic curve. The mean centres of the resulting
density and blackness distributions each vary with the star magnitude;
their variations are taken as an estimate of the' astrometric magnitude
errors If the tolerance for these errors is set at arc sec it appears
that a geometrical coma tolerance of arc sec is a reasonable value for
a large Ritchey- telescope. In general, the `magnitude errors' diminish
when the seeing deteriorates (though random errors of measurement would
then increase); they are increased by a slight focusing error and also
by a decrease in the total scale of the emulsion, such as is generally
associated with increasing contrast ,`. Of particular interest is the
conclusion that the alignment tolerances for photographic astrometry are
probably less stringent than those for visual double star measurement.
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Title: Narrow-Band Photometry at the Cambridge Observatories
Authors: Redman, R. O.
1966IAUS...24..155R Altcode:
No abstract at ADS
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Title: Coma
Authors: Redman, R. O.
1966IAUS...27...91R Altcode:
No abstract at ADS
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Title: Discussion on the Quiet Chromosphere
Authors: Redman, R. O.
1965ASSL....1..206R Altcode: 1965sosp.conf..206R
No abstract at ADS
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Title: A Conservative View of the Planets
Authors: Redman, R. O.
1962Natur.194...48R Altcode:
No abstract at ADS
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Title: The Natural History of Galaxies
Authors: Redman, R. O.
1961Natur.192..838R Altcode:
No abstract at ADS
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Title: Photometry in Astronomy
Authors: Redman, R. O.
1961QJRAS...2...96R Altcode: 1961QJRAS...2...96.
No abstract at ADS
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Title: Professor F. J. M. Stratton, F.R.S.
Authors: Redman, R. O.
1961JRASC..55....9R Altcode:
No abstract at ADS
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Title: General Astrophysics
Authors: Redman, R. O.
1960Natur.188..348R Altcode:
No abstract at ADS
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Title: The Work of the Cambridge Observatories
Authors: Redman, R. O.
1960QJRAS...1...10R Altcode: 1960QJRAS...1...10.
No abstract at ADS
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Title: Stellar Populations
Authors: Redman, R. O.
1960Natur.185..412R Altcode:
No abstract at ADS
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Title: Meeting of 1960 January 8
Authors: Redman, R. O.
1960MNRAS.120....1R Altcode:
No abstract at ADS
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Title: Photoelectric measurements of the λ4200 A CN band and the
G band in G8-K5 spectra
Authors: Griffin, R. F.; Redman, R. O.
1960MNRAS.120..287G Altcode:
A description is given of a rapid method of using a spectrometer to
give reproducible photoelectric measures of integrated intensities
over significant features of stellar spectra, without the necessity
for a sky of photometric quality. The accuracy achieved is I per
cent. The A4200 A CN band has been measured in 712 late-type stars
and the G band in 212 of these. Absolute magnitudes derived from CN
intensities have mean errors of at least 1m .5. There is only a weak
correlation of weak CN with high space velocity. "Weak-line" stars have
no anomaly in their CN absorption; "strong-line" stars have slightly
enhanced CN. For G to Ki stars the spectral type deduced from G band
intensities has a mean deviation of 0 15 class from the MK type. There
is a small absolute magnitude effect, the G band strengthening with
intrinsic luminosity. High-velocity stars have completely normal
G band intensities. "Weakline" stars show the G band very slightly
stronger," strong-line" stars show it slightly weaker than the mean,
but the individual scatter is fairly large and the difference between
the two groups is scarcely significant statistically.
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Title: Dust and gas between the Earth and the Sun
Authors: Redman, R. O.
1959Obs....79..172R Altcode:
No abstract at ADS
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Title: Russian Astrophysics
Authors: Redman, R. O.
1958Natur.182..548R Altcode:
No abstract at ADS
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Title: International Astronomy
Authors: Redman, R. O.
1957Natur.180..824R Altcode:
No abstract at ADS
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Title: Planetary Nebulae
Authors: Redman, R. O.
1956Natur.178.1315R Altcode:
No abstract at ADS
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Title: International Co-Ordination of Galactic Research
Authors: Redman, R. O.
1955Natur.176..847R Altcode:
No abstract at ADS
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Title: International Astronomical Union: General Assembly in Dublin
Authors: Redman, R. O.
1955Natur.176..626R Altcode:
No abstract at ADS
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Title: British Astronomers at the Total Solar Eclipse of June 20
Authors: Redman, R. O.
1955Natur.175.1018R Altcode:
No abstract at ADS
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Title: The widths of narrow lines in the spectrum of the low
chromosphere, measured at the total eclipse of February 25, 1952
Authors: Redman, R. O.
1955VA......1..713R Altcode:
The spectrum of the chromosphere was photographed at the total solar
eclipse of 25th February, 1952, with a slit spectrograph, using
the second order of a 6-in. Rowland concave grating. Line widths
were measured in both ultra-violet and yellow. Both regions show ξ
<SUB>0</SUB> near 2·5 km per sec. for heavy elements in the lowest
chromosphere (average line of sight velocity about 1·8 km per sec.),
in close agreement with measures made at the 1940 eclipse. There is
some evidence for a small increase of velocity with height.
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Title: Photographic and photovisual magnitudes of 7m—10m stars in
the +15° Selected Areas.
Authors: Beer, A.; Redman, R. O.; Yates, G. G.
1955MmRAS..67....1B Altcode:
No abstract at ADS
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Title: Total Solar Eclipse of June 30: British Expeditions' Results
Authors: Redman, R. O.
1954Natur.174..247R Altcode:
No abstract at ADS
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Title: Photographic and photovisual magnitudes of
7<SUP>m</SUP>-10<SUP>m</SUP> stars in the + 15° Selected Areas
Authors: Beer, A.; Redman, R. O.; Yates, G. G.
1954MNRAS.114..271B Altcode:
In order to provide a closer link between star magnitudes in the
northern and southern skies, pg and pv magnitudes of 1268 stars in
the twenty-four Selected Areas at Q 15 have been determined on the
international magnitude system of the NPS. The first part of the
programme was carried out by in-focus photography, using the Cape
photometric cameras, following approximately the same procedure as that
used at the Cape. The standard stars were taken from the Seares, Ross,
Joyner (SRJ) catalogue. Stars in nine of the Selected Areas were also
measured photoelectrically, using a pulse- counting photometer, again
with comparison stars near the Pole. In addition 135 SRJ stars were
measured photoelectrically to verify the relation of SRJ magnitudes
to the NPS, while all NPS stars brighter than IO'n.7 pv were measured
photoelectrically, to examine their self-consistency of scale. After
taking into account the scale and colour errors of SRJ, the inter-
agreement between photographic and photoelectric measures at ¾ 150
is satisfactory. For nine Areas together the mean zero difference
(photoelectric minus photographic) is ¾om.007+ on' oio pg, and
y0m.019+ 0m.007 pv. Use of a comparatively short series of measures
made earlier at the Cape has allowed a provisional comparison with
the S magnitude system, the present basis of stellar photometry at
the Cape. With single photoelectric readings in the order standard
star S, field star F, standard star S, sky", the standard error of
the field magnitude is 0m o6 pg, 0m.045 pv. The standard error of one
photographic measure of an individual star, based on four exposures in
the order SFFS, is o .o6 pg, 011' o6 pv, provided the plate zero error
is known independently from photoelectric measures. If there is no
such information with regard to zero error, the standard error for one
star measured photographically on one plate only is om.o8 pg and o11'
o8 pv. There is good evidence that in England the errors of stellar
photometry are determined chiefly by the sky, and depend heavily on
the stringency with which observing nights are selected. The standard
error of one catalogue magnitude varies, according to Area, over the
ranges 011' o3oo o45 pg, o11' ' 045 pv. The paper concludes with a
few comparisons with other catalogues and a short examination of the
relation between spectral types and colour indices.
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Title: Temperature and turbulence in the chromosphere
Authors: Redman, R. O.; Suemoto, Z.
1954MNRAS.114..524R Altcode:
Measures of chromospheric line profiles in high resolution spectrograms
obtained at the total solar eclipse of 1952 February 25 have been used
to investigate further the question of temperature and turbulence in the
solar chromosphere. In trying to deduce a distribution of line-of-sight
velocities, arising from either temperature motions or turbulence,
two problems are encountered : (a) to estimate the chromospheric
heights to which the spectra refer, and (b) to correct the measures
for broadening by self-absorption and Stark effect. Heights have been
estimated partly from a comparison of line intensity ratios with those
measured by Dr J. Houtgast on slitless spectrograms obtained at the same
eclipse, and partly from the time of exposures, using the motion of
the Moon relative to the Sun. Broadening by self- absorption has been
estimated in the case of metallic lines by an empirical method. The
corrected line widths, together with others of He 1, suggest an
approximately linear increase of line-of-sight velocity with height,
from km/sec at tbe base of the chromosphere, to 16 km/sec at height
2600 km. Taking into account the uncertainty in effective height, these
results agree with those obtained in 1940. The hydrogen Balmer lines
have been examined in more detail. The earlier members of the series
are broadened by self-absorption, while later members are broadened
by Stark effect. Both kinds of broadening were first estimated by an
empirical method, which led to the conclusion that the temperature of
the lower chromosphere does not exceed 10 000 deg. K. The hydrogen line
widths were then computed more elaborately by a theoretical method,
which showed that the observations could be fitted almost as well by
a temperature 6 ooo deg. as by 10 000 deg. It seems unlikely that the
present data will yield any closer estimate of temperature than this.
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Title: The flash spectrum without eclipse
Authors: Redman, R. O.
1953Obs....73..242R Altcode:
No abstract at ADS
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Title: Report of proceedings of Cambridge Observatories
Authors: Redman, R. O.
1952MNRAS.112..295. Altcode: 1952MNRAS.112..295R
No abstract at ADS
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Title: The continuous spectrum of a prominence observed at the total
solar eclipse of 1952 February 25.
Authors: Zanstra, H.; Redman, R. O.
1952PRNAA..55..598Z Altcode: 1952RNAAS..55..598Z
No abstract at ADS
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Title: Stellar Energy and Evolution
Authors: Redman, R. O.
1951Natur.167..743R Altcode:
No abstract at ADS
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Title: Reply to Evans
Authors: Redman, R. O.
1951Obs....71...76R Altcode:
No abstract at ADS
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Title: Planetary Atmospheres
Authors: Redman, R. O.
1950Natur.165..987R Altcode:
No abstract at ADS
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Title: Solar Physics for the Layman
Authors: Redman, R. O.
1950Natur.165..741R Altcode:
No abstract at ADS
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Title: Determination of Stellar Magnitudes by in-focus Photographic
Photometry
Authors: Menzies, A.; Redman, R. O.; Stoy, R. H.
1949MNRAS.109..647M Altcode:
No abstract at ADS
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Title: The observational problem of stellar magnitudes and colours
Authors: Stoy, R. H.; Redman, R. O.
1946Obs....66..330S Altcode:
No abstract at ADS
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Title: Post-war astronomy
Authors: Redman, R. O.
1945Obs....66..153R Altcode:
No abstract at ADS
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Title: The Fabry method of stellar photometry
Authors: Redman, R. O.
1945MNRAS.105..212R Altcode:
No abstract at ADS
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Title: Sir Arthur Eddington, O. M. (Obituary)
Authors: Redman, R. O.
1945MNSSA...4...26R Altcode:
No abstract at ADS
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Title: Fifty years of progress in astronomy
Authors: Redman, R. O.
1944Obs....65..213R Altcode:
No abstract at ADS
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Title: The roughness of the Sun's surface
Authors: Redman, R. O.
1944Obs....65..147R Altcode:
No abstract at ADS
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Title: Some problems of the puter layers of the Sun (Council report
on the progress of astronomy)
Authors: Redman, R. O.
1944MNRAS.104...99R Altcode:
No abstract at ADS
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Title: Fifty Years of Progress in Astronomy
Authors: Redman, R. O.
1944MNSSA...3...33R Altcode:
No abstract at ADS
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Title: An Astronomical Institute for South Africa?
Authors: Redman, R. O.
1944MNSSA...3...46R Altcode:
No abstract at ADS
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Title: Spectrographic observations at the total solar eclipse of
1940 October 1 III. The spectrum of the extreme limb of the Sun
Authors: Redman, R. O.
1943MNRAS.103..173R Altcode:
No abstract at ADS
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Title: Note on a further search for polarization in Fraunhofer lines
Authors: Redman, R. O.
1943MNRAS.103..329R Altcode:
No abstract at ADS
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Title: The Possibility of Making Astronomical Observations from
Aircraft
Authors: Redman, R. O.
1943MNSSA...2...96R Altcode:
No abstract at ADS
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Title: Obituary: J. S. Plaskett
Authors: Redman, R. O.
1942Obs....64..207R Altcode:
No abstract at ADS
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Title: Spectrographic observations at the total solar eclipse of
1940 October 1. I. Instrument and observational procedure
Authors: Redman, R. O.
1942MNRAS.102..134R Altcode:
No abstract at ADS
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Title: Spectrographic observations at the total solar eclipse of 1940
October 1. II. Concerning the flash spectrum and automic velocities
in the chromosphere
Authors: Redman, R. O.
1942MNRAS.102..140R Altcode:
No abstract at ADS
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Title: Observational search for polarisation in the calcium line λ
4227 A. near the Sun's limb
Authors: Redman, R. O.
1941MNRAS.101..266R Altcode:
No abstract at ADS
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Title: Spectrographic observations at the total solar eclipse of
1940 October 1
Authors: Redman, R. O.
1940Obs....63..307R Altcode:
No abstract at ADS
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Title: A new projection micrometer machine for stellar spectrograms
Authors: Redman, R. O.
1939MNRAS..99..686R Altcode:
No abstract at ADS
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Title: Extra-galactic nebulae: their nuclei and their inclinations
to the line of sight
Authors: Redman, R. O.
1938Obs....61..216R Altcode:
No abstract at ADS
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Title: Photographic photometry of the elliptical nebulæ (Second
paper)
Authors: Redman, R. O.; Shirley, E. G.
1938MNRAS..98..613R Altcode:
No abstract at ADS
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Title: Line profiles (Council report on the progress of astronomy)
Authors: Redman, R. O.
1938MNRAS..98..311R Altcode:
No abstract at ADS
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Title: The cores of certain Fraunhofer lines
Authors: Redman, R. O.
1937MNRAS..97..552R Altcode:
No abstract at ADS
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Title: The construction and performance of a spectrograph for studying
the solar chromosphere
Authors: Redman, R. O.
1937MNRAS..97..668R Altcode:
No abstract at ADS
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Title: Photometry of the Andromeda nebula, M 31'
Authors: Redman, R. O.; Shirley, E. G.
1937MNRAS..97..416R Altcode:
No abstract at ADS
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Title: Centre to limb variation of line intensity
Authors: Redman, R. O.
1936Obs....59..287R Altcode:
No abstract at ADS
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Title: Photometry, Photographic, of the elliptical nebulae
Authors: Redman, R. O.
1936MNRAS..96..588R Altcode:
No abstract at ADS
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Title: Centre to limb variation in Fraunhofer line intensity over
the disc of the primary star of U Cephei and of U sagitt&aelig
Authors: Redman, R. O.
1936MNRAS..96..488R Altcode:
No abstract at ADS
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Title: A determination of the profile of the calcium line λ4227 in
the solar spectrum, using a prism spectrograph and monochromator
Authors: Redman, R. O.
1935MNRAS..95..742R Altcode:
No abstract at ADS
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Title: Two points arising in spectrophotometric work
Authors: Redman, R. O.
1935Obs....58..126R Altcode:
No abstract at ADS
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Title: Note on a monochromator for use in determining Fraunhofer
line profiles
Authors: Redman, R. O.
1935MNRAS..95..290R Altcode:
No abstract at ADS
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Title: Stellar Radial Velocities
Authors: Redman, R. O.
1932Natur.130..836R Altcode:
No abstract at ADS
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Title: The galactic rotation effect in late type stars (second paper)
Authors: Redman, R. O.
1931MNRAS..92..107R Altcode:
No abstract at ADS
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Title: Note on three variable stars : (i) SV Ursæ Majoris, (ii)
V Ursæ Majoris, (iii) WY Geminorum
Authors: Redman, R. O.
1931MNRAS..92..116R Altcode:
No abstract at ADS
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Title: Y Cygni
Authors: Redman, R. O.
1931Obs....54..195R Altcode:
No abstract at ADS
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Title: The Galactic Rotation Effect in Some Late Type Stars
Authors: Redman, R. O.
1931PDAO....4..325R Altcode:
No abstract at ADS
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Title: Y Cygni
Authors: Redman, R. O.
1931PDAO....4..341R Altcode:
No abstract at ADS
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Title: The galactic rotation effect in some late type stars, II.
Authors: Redman, R. O.
1931PDAO....6...27R Altcode:
No abstract at ADS
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Title: Y Cygni.
Authors: Redman, R. O.
1930PASP...42..250R Altcode:
No abstract at ADS
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Title: Y Cygni. Some spectroscopic results
Authors: Redman, R. O.
1930MNRAS..90..754R Altcode:
No abstract at ADS
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Title: The galactic rotation effect in late-type stars
Authors: Redman, R. O.
1930MNRAS..90..690R Altcode:
No abstract at ADS
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Title: The galactic rotation effect in some late- type stars.
Authors: Redman, R. O.
1930PDAO....4..325R Altcode:
No abstract at ADS
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Title: Y Cygni.
Authors: Redman, R. O.
1930PDAO....4..341R Altcode:
No abstract at ADS
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Title: An investigation into the parallaxes, absolute magnitudes
and motions of certain stars
Authors: Redman, Roderick Oliver
1930PhDT.........5R Altcode:
No abstract at ADS
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Title: Seminar Talk (Semi-regular Variables)
Authors: Redman, R. O.
1930JRASC..24...38R Altcode:
No abstract at ADS
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Title: A determination from binary star data of the giant and dwarf
branches of the Russell diagram
Authors: Redman, R. O.
1928MNRAS..88..718R Altcode:
No abstract at ADS
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Title: A statistical study of the effect of the mass-luminosity
relation on the hypothetical parallaxes of binary stars
Authors: Redman, R. O.
1927MNRAS..88...33R Altcode:
No abstract at ADS
