Physical parameters of the O6.5V+B1V eclipsing binary system LS 1135

E. FERNÁNDEZ LAJÚS; V. S. NIEMELA

Monthly Notices of the Royal Astronomical Society

The Royal Astronomical Society, Blackwell Publishing

Lugar: Cambridge; Año: 2006 vol. 367 p. 1709 - 1713

0035-8711

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 M1~ 30 +/- 1Msolar and M2~ 9 +/- 1Msolar, and radii R1~ 12 +/- 1Rsolar and R2~ 5 +/- 1Rsolar for primary and secondary components, respectively. Both the components are well inside their respective Roche lobes. Fixing the Teff of the primary to the value corresponding to its spectral type (O6.5V), the Teff obtained for the secondary component corresponds approximately to a spectral type of B1V. The mass ratio M2/M1~ 0.3 is among the lowest known values for spectroscopic binaries with O-type components.