The Origin of Helium-Rich Subdwarf O Stars

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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.
Original languageEnglish
Title of host publicationIn: Hydrogen-Deficient Stars - ASP Conf Series 391
PublisherAstronomical Society of the Pacific
ISBN (Print)978-1-58381-653-0, 978-1-58381-652-3
Publication statusPublished - 2008


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