Stars: subdwarfs - Open Access .click

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Physical parameters for subdwarf B stars with composite spectra [PDF]

Astronomy & Astrophysics, 2002
For many years, the evolutionary origins of subdwarf B stars remained a mystery. Observations of sdB stars with composite spectra and theoretical considerations suggested that binary star evolution should play a major role, but proof that a large fraction are binaries has taken a decade to establish.
R. Aznar Cuadrado, C. S. Jeffery
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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, John Norris, Peter G. Gross +2 more
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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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Meet the family − the catalog of known hot subdwarf stars

Open Astronomy, 2017
Abstract In preparation for the upcoming all-sky data releases of the Gaia mission, we compiled a catalog of known hot subdwarf stars and candidates drawn from the literature and yet unpublished databases. The catalog contains 5613 unique sources and provides multi-band photometry from the ultraviolet to the far infrared, ground based ...
Geier S. +8 more
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Studies of subdwarf B stars

, 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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The population of hot subdwarf stars studied withGaia [PDF]

Astronomy & Astrophysics, 2020
In light of substantial new discoveries of hot subdwarfs by ongoing spectroscopic surveys and the availability of new all-sky data from ground-based photometric surveys and theGaiamission Data Release 2, we compiled an updated catalogue of the known hot subdwarf stars.
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On the formation of single and binary helium-rich subdwarf O stars [PDF]