The Origin of Helium-Rich Subdwarf O Stars

Details The Origin of Helium-Rich Subdwarf O Stars The Origin of Helium-Rich Subdwarf O Stars

Jul 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aspc..391..257n&link_type=abstract

Hydrogen-Deficient Stars ASP Conference Series, Vol. 391, proceedings of the conference held 17-21 September, 2007, at Eberhard

Astronomy and Astrophysics

Astronomy

5

Scientific paper

The origin of helium-rich subdwarf O stars (He-sdO) is still unclear. Significant progress has been made recently in placing them in the Hertzsprung--Russell diagram. However, the question of their progenitors is still unsolved. It is unclear which types of stars evolve into He-sdOs and whether they are formed by all galactic populations. Here I will present results of a radial velocity (RV) survey of He-sdOs, which will be used to constrain the binary fraction and evaluate population membership.

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