Open AccessPhysical parameters of the O6.5V+B1V eclipsing binary system LS 1135
Author(s) -
Fernández Lajús E.,
Niemela V. S.
Publication year - 2006
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.1365-2966.2006.10074.x
Subject(s) - physics , astrophysics , orbital inclination , binary number , sky , mass ratio , orbital period , orbital elements , binary system , primary component , stellar classification , contact binary , binary star , astronomy , stars , computer network , arithmetic , mathematics , computer science
The ‘All Sky Automated Survey’ (ASAS) photometric observations of LS 1135, an O‐type single‐lined binary (SB1) system with an orbital period of 2.7 d, show that the system is also eclipsing performing a numerical model of this binary based on the Wilson–Devinney method. We obtained an orbital inclination . With this value of the inclination, we deduced masses M 1 ∼ 30 ± 1 M ⊙ and M 2 ∼ 9 ± 1 M ⊙ , and radii R 1 ∼ 12 ± 1 R ⊙ and R 2 ∼ 5 ± 1 R ⊙ for primary and secondary components, respectively. Both the components are well inside their respective Roche lobes. Fixing the T eff of the primary to the value corresponding to its spectral type (O6.5V), the T eff obtained for the secondary component corresponds approximately to a spectral type of B1V. The mass ratio M 2 / M 1 ∼ 0.3 is among the lowest known values for spectroscopic binaries with O‐type components.