The massive Wolf-Rayet binary SMC WR7

We present a study of optical spectra of the Wolf-Rayet star AzV 336a (= SMC WR7) in the Small Magellanic Cloud. Our study is based on data obtained at several Observatories between 1988 and 2001. We find SMC WR7 to be a double-lined WN+O6 spectroscopic binary with an orbital period of 19.56 d. The...

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Detalles Bibliográficos
Autores principales: Niemelä, Virpi Sinikka, Massey, P., Testor, G., Giménez Benítez, Sixto
Formato: Articulo
Lenguaje:Inglés
Publicado: 2002
Materias:
Ciencias Astronómicas
Binaries: spectroscopic
Stars: individual: AzV 336a (=SMC WR7)
Stars: Wolf-Rayet
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/84657
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-84657
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: individual: AzV 336a (=SMC WR7)
Stars: Wolf-Rayet
spellingShingle Ciencias Astronómicas
Binaries: spectroscopic
Stars: individual: AzV 336a (=SMC WR7)
Stars: Wolf-Rayet
Niemelä, Virpi Sinikka
Massey, P.
Testor, G.
Giménez Benítez, Sixto
The massive Wolf-Rayet binary SMC WR7
topic_facet Ciencias Astronómicas
Binaries: spectroscopic
Stars: individual: AzV 336a (=SMC WR7)
Stars: Wolf-Rayet
description We present a study of optical spectra of the Wolf-Rayet star AzV 336a (= SMC WR7) in the Small Magellanic Cloud. Our study is based on data obtained at several Observatories between 1988 and 2001. We find SMC WR7 to be a double-lined WN+O6 spectroscopic binary with an orbital period of 19.56 d. The radial velocities of the He absorption lines of the O6 component and the strong He II emission at λ4686 Å of the WN component describe anti-phased orbital motions. However, they show a small phase shift of ∼ 1 d. We discuss possible explanations for this phase shift. The amplitude of the radial velocity variations of He II emission is twice that of the absorption lines. The binary components have fairly high minimum masses, ∼ 18 and 34 M⊙ for the WN and O6 components, respectively.
format Articulo
Articulo
author Niemelä, Virpi Sinikka
Massey, P.
Testor, G.
Giménez Benítez, Sixto
author_facet Niemelä, Virpi Sinikka
Massey, P.
Testor, G.
Giménez Benítez, Sixto
author_sort Niemelä, Virpi Sinikka
title The massive Wolf-Rayet binary SMC WR7
title_short The massive Wolf-Rayet binary SMC WR7
title_full The massive Wolf-Rayet binary SMC WR7
title_fullStr The massive Wolf-Rayet binary SMC WR7
title_full_unstemmed The massive Wolf-Rayet binary SMC WR7
title_sort massive wolf-rayet binary smc wr7
publishDate 2002
url http://sedici.unlp.edu.ar/handle/10915/84657
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