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

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. This prompted us to re-examine the spectra used in the previously published spectroscopic orbit. Ou...

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Detalles Bibliográficos
Autores principales: Fernández Lajús, Eduardo, Niemelä, Virpi Sinikka
Formato: Articulo
Lenguaje:Inglés
Publicado: 2006
Materias:
Ciencias Astronómicas
Binaries : spectroscopic
Binaries: eclipsing
Stars: early-type
Stars: individual: LS 1135
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/83343
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-83343
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Astronómicas
Binaries : spectroscopic
Binaries: eclipsing
Stars: early-type
Stars: individual: LS 1135
spellingShingle Ciencias Astronómicas
Binaries : spectroscopic
Binaries: eclipsing
Stars: early-type
Stars: individual: LS 1135
Fernández Lajús, Eduardo
Niemelä, Virpi Sinikka
Physical parameters of the O6.5V+B1V eclipsing binary system LS 1135
topic_facet Ciencias Astronómicas
Binaries : spectroscopic
Binaries: eclipsing
Stars: early-type
Stars: individual: LS 1135
description 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. This prompted us to re-examine the spectra used in the previously published spectroscopic orbit. Our new analysis of the spectra obtained near quadratures, reveals the presence of faint lines of the secondary component. We present for the first time a double-lined radial velocity orbit and values of physical parameters of this binary system. These values were obtained by analysing the ASAS photometry jointly with the radial velocities of both components by performing a numerical model of this binary based on the Wilson-Devinney method. We obtained an orbital inclination i ∼ 68°.5. With this value of the inclination, we deduced masses M1 ∼ 30 ± l M⊙ and M2 ∼ 9 ± 1 M⊙, and radii R1 ∼ 12 ± 1 R ⊙ and R2 ∼ 5 ± 1R⊙ 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.
format Articulo
Articulo
author Fernández Lajús, Eduardo
Niemelä, Virpi Sinikka
author_facet Fernández Lajús, Eduardo
Niemelä, Virpi Sinikka
author_sort Fernández Lajús, Eduardo
title Physical parameters of the O6.5V+B1V eclipsing binary system LS 1135
title_short Physical parameters of the O6.5V+B1V eclipsing binary system LS 1135
title_full Physical parameters of the O6.5V+B1V eclipsing binary system LS 1135
title_fullStr Physical parameters of the O6.5V+B1V eclipsing binary system LS 1135
title_full_unstemmed Physical parameters of the O6.5V+B1V eclipsing binary system LS 1135
title_sort physical parameters of the o6.5v+b1v eclipsing binary system ls 1135
publishDate 2006
url http://sedici.unlp.edu.ar/handle/10915/83343
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AT niemelavirpisinikka physicalparametersoftheo65vb1veclipsingbinarysystemls1135
bdutipo_str Repositorios
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