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HS 2333 + 3927: a new sdB binary with a large reflection effect |
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| Authors: | CA Karl U Heber H Drechsel R Napiwotzki M Altmann R Østensen S Folkes JE Solheim O Cordes B Voss D Koester |
| Institution: | 1. Dr. Remeis-Sternwarte Bamberg, Astronomisches Institut der Universit?t Erlangen-Nürnberg, Sternwartstra?e 7, D-96049, Bamberg, Germany 2. Isaac Newton Group of Telescopes, E-37800, Santa Cruz de La Palma, Canary Islands, Spain 3. University of Troms?, Department of Physics, N-9037, Troms?, Norway 4. Sternwarte der Universit?t Bonn, Auf dem Hügel 71, 53121, Bonn, Germany 5. Institut für Theoretische Physik und Astrophysik, Universit?t Kiel, 24098, Kiel, Germany |
| 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. |
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