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A FEROS Survey of Hot Subdwarf Stars

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    0495880 - ASÚ 2019 RIV PL eng J - Journal Article
    Vennes, Stephane - Németh, P. - Kawka, Adela
    A FEROS Survey of Hot Subdwarf Stars.
    Open Astronomy. Roč. 27, č. 1 (2018), s. 7-13. E-ISSN 2543-6376
    R&D Projects: GA ČR GA15-15943S; GA MŠMT LG14013
    Institutional support: RVO:67985815
    Keywords : white dwarfs * spectroscopic * subdwarfs
    OECD category: Astronomy (including astrophysics,space science)
    Impact factor: 0.350, year: 2018

    We have completed a survey of twenty-two ultraviolet-selected hot subdwarfs using the Fiber-fed Extended Range Optical Spectrograph (FEROS) and the 2.2-m telescope at La Silla. The sample includes apparently single objects as well as hot subdwarfs paired with a bright, unresolved companion. The sample was extracted from our GALEX catalogue of hot subdwarf stars. We identified three new short-period systems (P = 3.5 hours to 5 days) and determined the orbital parameters of a long-period (P = 62(d). 66) sdO plus G III system. This particular system should evolve into a close double degenerate system following a second common envelope phase. We also conducted a chemical abundance study of the subdwarfs: Some objects show nitrogen and argon abundance excess with respect to oxygen. We present key results of this programme.
    Permanent Link: http://hdl.handle.net/11104/0288758

     
     
Number of the records: 1  

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