Physical parameters of the O6.5V+B1V eclipsing binary system LS 1135 |
| |
Authors: | E. Ferná ndez Lajú s &dagger , V. S. Niemela &Dagger |
| |
Affiliation: | Facultad de Ciencias Astronómicas y Geofísicas, Universidad Nacional de La Plata, Argentina |
| |
Abstract: | 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. |
| |
Keywords: | binaries: eclipsing binaries : spectroscopic stars: early-type stars: individual: LS 1135 |
|
|