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        HS 2333 + 3927: a new sdB binary with a large reflection effect

        Author
        Karl, C.
        Heber, U.
        Drechsel, H.
        Napiwotzki, R.
        Altmann, M.
        Ostensen, R.
        Folkes, S.
        Solheim, J.E.
        Cordes, O.
        Voss, B.
        Koester, D.
        Attention
        2299/3705
        Abstract
        We report the discovery of a binary, HS 2233 + 3927, consisting of an sdB star with a faint companion. From its lightcurve the orbital period of 14,844 s, the mass ratio, the inclination, and other system parameters are derived. The companion does not contribute to the optical light of the system except through a strong reflection effect. The semi-amplitude of the radial velocity curve K 1= 89.6 km/s−1 and a mass function of f(m) = 0.013 M ⊙ are determined. A preliminary spectroscopic analysis of the blue spectra using NLTE model atmospheres results in Teff= 36 500 K, log g= 5.70, and log(n He/n H) =−2.15. These parameters are typical for sdB stars, the companion is probably an M dwarf.
        Publication date
        2004
        Published in
        Astrophysics and Space Science
        Published version
        https://doi.org/10.1023/B:ASTR.0000044334.98860.ab
        Other links
        http://hdl.handle.net/2299/3705
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