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Symposium - International Astronomical Union, 1966
The photometric programmes at the Cape Observatory and the parallel spectroscopic programmes undertaken by Cape staff at the Radcliffe Observatory, Pretoria, have enabled us to produce considerable quantities of southern star data. Some of this has been published in the seriesFundamental Data for Southern Starsof which No. 5 has just appeared. Included
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The photometric programmes at the Cape Observatory and the parallel spectroscopic programmes undertaken by Cape staff at the Radcliffe Observatory, Pretoria, have enabled us to produce considerable quantities of southern star data. Some of this has been published in the seriesFundamental Data for Southern Starsof which No. 5 has just appeared. Included
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Nature, 1982
CH giants, with Mv around −1 to 0.5 (refs 1,2), are stars which have the following well-known properties: (1) weak lines of iron-group elements2, (2) rich in carbon, exceptionally strong features of CH, moderately strong (depending on the surface temperature) C2 and CN (refs 1,2), (3) relatively strong lines of the s-process elements (especially Sr and
Liang-Tai George Chiu, Richard G. Kron
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CH giants, with Mv around −1 to 0.5 (refs 1,2), are stars which have the following well-known properties: (1) weak lines of iron-group elements2, (2) rich in carbon, exceptionally strong features of CH, moderately strong (depending on the surface temperature) C2 and CN (refs 1,2), (3) relatively strong lines of the s-process elements (especially Sr and
Liang-Tai George Chiu, Richard G. Kron
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Hot Subdwarfs in Precataclysmic Binaries
Astrophysics and Space Science, 2006We present a brief review of the recent results in modeling physical processes in strongly irradiated atmospheres of unevolved companions in precataclysmic binary systems (PCB) and their light curves. Constraints on physical parameters of the hot sdws primaries, thermal instability in upper irradiated atmosphere, monochromatic albedos, the deficit of ...
Vladislav Pustynski, Izold Pustylnik
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The Spatial Motion of Subdwarfs
Publications of the Astronomical Society of Japan, 1965Abstract From available observed data on 105 subdwarfs, it is found that their spectral types assigned are earlier by 6 or 7 subdivisions of a spectral type than those compatible with their effective temperature, their estimated space density is of order of 4 × 10–4 stars/pc3 or 2 × 10–4 M⊙/pc3 and their solar motion and the size of ...
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1993
Spectroscopic and photometric data give evidence for a large fraction of binary stars among hot subdwarfs. Since our work aims at determining atmospheric parameters and distances of sdB and sdOB stars, we have to take special care of this aspect. We try to deconvolve the photometric data and derive colours for the subdwarf component of the binary.
A. Theissen +3 more
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Spectroscopic and photometric data give evidence for a large fraction of binary stars among hot subdwarfs. Since our work aims at determining atmospheric parameters and distances of sdB and sdOB stars, we have to take special care of this aspect. We try to deconvolve the photometric data and derive colours for the subdwarf component of the binary.
A. Theissen +3 more
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The pulsations in subdwarf B stars
Astronomische Nachrichten, 2001In this paper, I review our present knowledge of the pulsation phenomenon that affects a fraction of the subdwarf B (sdB) stars. The observed properties of this recently discovered class of pulsating stars are summarized and the current status of the theory explaining the driving of the observed pulsations is discussed.
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Publications of the Astronomical Society of the Pacific, 1940
D. M. Popper, C. K. Seyfert
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D. M. Popper, C. K. Seyfert
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The excitation of g-mode pulsations in hot helium-rich subdwarfs
Monthly notices of the Royal Astronomical Society, 2018H. Saio, C. Jeffery
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