Physical parameters of the O6.5V+B1V eclipsing binary system LS 1135 |
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| Authors: | E Fernández Lajús † V S Niemela ‡ |
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| Institution: | Facultad de Ciencias Astronómicas y Geofísicas, Universidad Nacional de La Plata, Argentina |
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| 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. |
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| Keywords: | binaries: eclipsing binaries : spectroscopic stars: early-type stars: individual: LS 1135 |
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