HS 2333+3927: A new sdB binary with a large reflection effect
Karl, CA × Heber, U Drechsel, H Napiwotzki, R Altmann, M Ostensen, Roy Folkes, S Solheim, JE Cordes, O Voss, B Koester, D #
Kluwer academic publ
Astrophysics and space science vol:291 issue:3 pages:283-289
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-circle dot are determined. A preliminary spectroscopic analysis of the blue spectra using NLTE model atmospheres results in T-eff = 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.