TY - JOUR
T1 - HS 2333 + 3927: a new sdB binary with a large reflection effect
AU - Karl, C.
AU - Heber, U.
AU - Drechsel, H.
AU - Napiwotzki, R.
AU - Altmann, M.
AU - Ostensen, R.
AU - Folkes, S.
AU - Solheim, J.E.
AU - Cordes, O.
AU - Voss, B.
AU - Koester, D.
N1 - “The original publication is available at www.springerlink.com”. Copyright Springer. [Full text of this article is not available in the UHRA]
PY - 2004
Y1 - 2004
N2 - 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.
AB - 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.
U2 - 10.1023/B:ASTR.0000044334.98860.ab
DO - 10.1023/B:ASTR.0000044334.98860.ab
M3 - Article
SN - 0004-640X
VL - 291
SP - 283
EP - 289
JO - Astrophysics and Space Science
JF - Astrophysics and Space Science
IS - 3-4
ER -