A new massive double-lined spectroscopic binary system: The Wolf-Rayet star WR 68a

Double-lined spectroscopic binary systems, containing a Wolf-Rayet and a massive O-type star, are key objects for the study of massive star evolution because these kinds of systems allow the determination of fundamental astrophysical parameters of their components. We have performed spectroscopic ob...

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Detalles Bibliográficos
Autores principales: Collado, A., Gamen, Roberto Claudio, Barbá, Rodolfo Héctor, Morrell, Nidia Irene
Formato: Articulo
Lenguaje:Inglés
Publicado: 2015
Materias:
Ciencias Astronómicas
binaries: spectroscopic
stars: fundamental parameters
stars: individual: WR 68a
stars: Wolf-Rayet
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/86395
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-86395
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
stars: fundamental parameters
stars: individual: WR 68a
stars: Wolf-Rayet
spellingShingle Ciencias Astronómicas
binaries: spectroscopic
stars: fundamental parameters
stars: individual: WR 68a
stars: Wolf-Rayet
Collado, A.
Gamen, Roberto Claudio
Barbá, Rodolfo Héctor
Morrell, Nidia Irene
A new massive double-lined spectroscopic binary system: The Wolf-Rayet star WR 68a
topic_facet Ciencias Astronómicas
binaries: spectroscopic
stars: fundamental parameters
stars: individual: WR 68a
stars: Wolf-Rayet
description Double-lined spectroscopic binary systems, containing a Wolf-Rayet and a massive O-type star, are key objects for the study of massive star evolution because these kinds of systems allow the determination of fundamental astrophysical parameters of their components. We have performed spectroscopic observations of the star WR 68a as part of a dedicated monitoring program of WR stars to discover new binary systems. We identified spectral lines of the two components of the system and disentangled the spectra. We measured the radial velocities in the separated spectra and determined the orbital solution. We discovered that WR 68a is a double-lined spectroscopic binary with an orbital period of 5.2207 days, very small or null eccentricity, and inclination ranging between 75 and 85 deg. We classified the binary components as WN6 and O5.5-6. The WN star is less massive than the O-type star with minimum masses of 15 ± 5 M<sub>⊙</sub> and 30 ± 4 M<sub>⊙</sub>, respectively. The equivalent width of the He II λ4686 emission line shows variations with the orbital phase, presenting a minimum when the WN star is in front of the system. The light curve constructed from available photometric data presents minima in both conjunctions of the system.
format Articulo
Articulo
author Collado, A.
Gamen, Roberto Claudio
Barbá, Rodolfo Héctor
Morrell, Nidia Irene
author_facet Collado, A.
Gamen, Roberto Claudio
Barbá, Rodolfo Héctor
Morrell, Nidia Irene
author_sort Collado, A.
title A new massive double-lined spectroscopic binary system: The Wolf-Rayet star WR 68a
title_short A new massive double-lined spectroscopic binary system: The Wolf-Rayet star WR 68a
title_full A new massive double-lined spectroscopic binary system: The Wolf-Rayet star WR 68a
title_fullStr A new massive double-lined spectroscopic binary system: The Wolf-Rayet star WR 68a
title_full_unstemmed A new massive double-lined spectroscopic binary system: The Wolf-Rayet star WR 68a
title_sort new massive double-lined spectroscopic binary system: the wolf-rayet star wr 68a
publishDate 2015
url http://sedici.unlp.edu.ar/handle/10915/86395
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