Results 61 to 70 of about 276,909 (151)
Ultraviolet Colors of Subdwarf O Stars [PDF]
Symposium - International Astronomical Union, 1978 The group of subdwarf O stars consisting of field stars and some central stars of old planetary nebulae does occupy an intresting place in the HR diagram. Greenstein and Sargent (1974) have tried to establish this place, and conclude that especially the hottest ones need ultraviolet data to improve the values of effective temperature and absolute ...
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Hot subdwarfs from the ESO Supernova Ia Progenitor Survey - I. Atmospheric parameters and cool companions of sdB stars [PDF]
, 2004 We present the analysis of a high-resolution, high-quality sample of optical spectra for 76 subdwarf B (sdB) stars from the ESO Supernova Ia Progenitor Survey (SPY, Napiwotzki et al. 2001).
T. Lisker +8 more
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Asteroseismic Analysis of Pulsating Subdwarf B Stars [PDF]
International Astronomical Union Colloquium, 2002 AbstractWe briefly present a method to perform detailed asteroseismological analyses of pulsating subdwarf B (sdB) stars (also referred to as the EC14026 stars). We use a forward approach based on the computation of large grids of sdB stellar models (each model being analyzed with a linear nonadiabatic pulsation code) to derive, in an objective way ...
S. Charpinet, G. Fontaine, P. Brassard
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, 2018 Subdwarf B (sdB) stars are horizontal branch stars with thin hydrogen envelopes surrounding a half solar mass helium core. Following their classification in 1966 by Greenstein, little progress was made in understanding these apparently common stars. When pulsators were discovered by Kilkenny et al.
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A FEROS Survey of Hot Subdwarf Stars
Open Astronomy, 2018 Abstract We have completed a survey of twenty-two ultraviolet-selected hot subdwarfs using the Fiber-fed Extended Range Optical Spectrograph (FEROS) and the 2.2-m telescope at La Silla. The sample includes apparently single objects as well as hot subdwarfs paired with a bright, unresolved companion.
Vennes, S., Németh, P., Kawka, Adela
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Binary Hypothesis for the Subdwarf B Stars
The Astrophysical Journal, 1976 While observational evidence exists for the composite nature of some of the subdwarf B stars, the conservation of total mass and angular momentum produces a companion whose visual magnitude is similar to that of the subdwarf in the cases we consider.
John G. Mengel +2 more
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On the formation of single and binary helium-rich subdwarf O stars [PDF]
, 2010 Stephen Justham +2 more
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Ultracool Subdwarfs: Metal-poor Stars and Brown Dwarfs Extending into the Late-type M, L and T Dwarf Regimes [PDF]
, 2004 Adam J. Burgasser +2 more
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Revised Metallicity Classes for Low‐Mass Stars: Dwarfs (dM), Subdwarfs (sdM), Extreme Subdwarfs (esdM), and Ultrasubdwarfs (usdM) [PDF]
, 2007 Sébastien Lépine +2 more
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Tidal Spin-up of Subdwarf B Stars
The Astrophysical JournalAbstract Hot subdwarf B (sdB) stars are stripped helium-burning stars that are often found in close binaries, where they experience strong tidal interactions. The dissipation of tidally excited gravity waves alters their rotational evolution throughout the sdB lifetime.
Linhao 林昊 Ma 马, Jim Fuller
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