Hot Subdwarf Stars

By U. Heber. 2009

335 citations recorded by the source corpus.

Hot subdwarf stars (sdBs, sdOs) are core helium-burning stars at the blue end of the 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-sdOs. 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 the Galaxy, potential SN Ia progenitors and probably a hidden population of neutron stars or black hole companions have great impact on astrophysics at large.

Subfields: Astronomy and Astrophysics, Instrumentation

View Paper: https://www.semanticscholar.org/paper/494a5543a61e4461bf79431575ad79f314af9653

How researchers see this paper

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In Astronomy and Astrophysics

1. D. Kasen
2. E. Quataert
3. B. Metzger
4. Robert G. Izzard
5. K. Shen
6. A. Mustill
7. O. De Marco
8. L. Bildsten

In Instrumentation

1. Robert G. Izzard
2. E. Quataert
3. K. Shen
4. A. Mustill
5. D. Kasen
6. O. De Marco
7. Eva Villaver
8. L. Bildsten

Citations in the corpus

• Dawes Review 6: The Impact of Companions on Stellar Evolution (2016, background): “These stars are known as subdwarf-B and subdwarf-O stars (Table 1) because they have surface temperatures in excess of about 20 000 K (Heber, 2009).”
• FORETELLINGS OF RAGNARÖK: WORLD-ENGULFING ASYMPTOTIC GIANTS AND THE INHERITANCE OF WHITE DWARFS (2012, background): “These planets could have survived the evolution of the star along the RGB, in the process possibly triggering mass loss to form an sdB star (Geier et al. 2009; Heber 2009; Soker 1998), or could be the remnants of the tidally destroyed metallic cores of massive planets (Bear & Soker 2012).”
• THE LONG-TERM EVOLUTION OF DOUBLE WHITE DWARF MERGERS (2011, background): “In the latter case, the second star lives for ∼ 100 Myr as a core He-burning sdO or sdB star before becoming a C/O WD (Heber 2009).”