Heber U (2009)
Publication Type: Journal article
Publication year: 2009
Series: Annual Review of Astronomy and Astrophysics
Book Volume: 47
Pages Range: 211-251
DOI: 10.1146/annurev-astro-082708-101836
Hot subdwarf stars (sdBs, sdOs) are core helium-burning stars at the blue end of die horizontal branch or have evolved even beyond that stage. They are found in all Galactic stellar populations and are sufficiently common to account for the UV-upturn of early-type galaxies. About half of the sdBs reside in close binaries; companions are white dwarfs or low-mass main-sequence stars. Binary population-synthesis models explain naturally the actual sdB binary fractions of field and globular cluster stars as well as of He-sdOs if white-dwarf mergers are considered. Hot helium flashes explain the chemical composition of He-sdüs. Asteroseismology of a dozen pulsating sdB stars allowed determination of their masses and detection of a planet to V391 Peg. The discoveries of an sdO star unbound to die Galaxy, potential SN Ia progenitors and probably a hidden population of neutron stars or black hole companions have great impact on astrophysics at large. Copyright © 2009 by Annual Reviews. All rights reserved.
APA:
Heber, U. (2009). Hot subdwarf stars. Annual Review of Astronomy and Astrophysics, 47, 211-251. https://doi.org/10.1146/annurev-astro-082708-101836
MLA:
Heber, Ulrich. "Hot subdwarf stars." Annual Review of Astronomy and Astrophysics 47 (2009): 211-251.
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