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HS 2333 + 3927: a new sdB binary with a large reflection effect: Extreme Horizontal Branch Stars and Related Objects (Guest Editor: P.F.L. Maxted)
Authors: Karl, C.A.1; Heber, U.2; Drechsel, H.2; Napiwotzki, R.2; Altmann, M.2; Østensen, R.3; Folkes, S.3; Solheim, J.E.4; Cordes, O.5; Voss, B.6; Koester, D.6
Source: Astrophysics and Space Science, Volume 291, Number 3, 2004 , pp. 283-289(7)
Publisher: Springer
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 K1 = 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(nHe/nH) = −2.15. These parameters are typical for sdB stars, the companion is probably an M dwarf.Keywords: stars:; binary; stars:; subdwarfs
Document Type: Research article
DOI: http://dx.doi.org/10.1023/B:ASTR.0000044334.98860.ab
Affiliations: 1: Dr. Remeis-Sternwarte Bamberg, Astronomisches Institut der Universität Erlangen-Nürnberg, Sternwartstraße 7, D-96049 Bamberg, Germany., Email: karl@sternwarte.uni-erlangen.de 2: Dr. Remeis-Sternwarte Bamberg, Astronomisches Institut der Universität Erlangen-Nürnberg, Sternwartstraße 7, D-96049 Bamberg, Germany 3: Isaac Newton Group of Telescopes, E-37800 Santa Cruz de La Palma, Canary Islands, Spain 4: University of Tromsø, Department of Physics, N-9037 Tromsø, Norway 5: Sternwarte der Universität Bonn, Auf dem Hügel 71, 53121 Bonn, Germany 6: Institut für Theoretische Physik und Astrophysik, Universität Kiel, 24098 Kiel, Germany;
Publication date: 2004-01-01
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- In this Subject: Astronomy
- By this author: Karl, C.A. ; Heber, U. ; Drechsel, H. ; Napiwotzki, R. ; Altmann, M. ; Østensen, R. ; Folkes, S. ; Solheim, J.E. ; Cordes, O. ; Voss, B. ; Koester, D.
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