Open AccessSpectroscopic solution of the star QX Cas
Author(s) -
Kjurkchieva D. P.,
Marchev D. V.,
Zola S.
Publication year - 2007
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1111/j.1365-2966.2007.12412.x
Subject(s) - physics , radial velocity , astrophysics , eccentricity (behavior) , orbital eccentricity , orbital period , line (geometry) , mass ratio , stars , orbit (dynamics) , star (game theory) , binary star , longitude , orbital elements , amplitude , orbital inclination , astronomy , binary number , latitude , geometry , optics , mathematics , arithmetic , engineering , political science , law , aerospace engineering
High‐resolution spectroscopic observations around the Hα line of the binary star QX Cas covering the whole orbital period are presented. Our radial velocity solution, the first ever determined, requires an eccentric orbit with the following orbital parameters: eccentricity, e = 0.22 ± 0.01 ; longitude of periastron, ω= 45°± 5° ; semi‐amplitudes of the radial velocity curves of the primary and secondary stars, K 1 sin i = 125.8 ± 0.9 km s −1 and K 2 sin i = 144.8 ± 1.1 km s −1 ; gamma velocity, V 0 = 65.1 ± 0.5 km s −1 ; and mass ratio, q = 0.869 ± 0.013 . The corresponding lower limits of the masses of the components and their separation are , and a sin i = 31.34 ± 0.48 R ⊙ .