The HD 5980 multiple system: masses and evolutionary status

New spectroscopic observations of the LBV/WR multiple system HD 5980 in the Small Magellanic Cloud are used to address the question of the masses and evolutionary status of the two very luminous stars in the 19.3 day eclipsing binary system. Two distinct components of the N V 4944 A˚ line are detect...

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Autores principales: Koenigsberger, G., Morrell, Nidia Irene, Hillier, D. J., Gamen, Roberto Claudio, Schneider, F. R. N., González Jiménez, N., Langer, N., Barbá, Rodolfo Héctor
Formato: Articulo
Lenguaje:Inglés
Publicado: 2014
Materias:
Ciencias Astronómicas
binaries
color figures
eclipsing - stars
evolution - stars
individual (HD 5980) - stars
massive - stars
Wolf-Rayet Online-only material
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/85133
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-85133
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
color figures
eclipsing - stars
evolution - stars
individual (HD 5980) - stars
massive - stars
Wolf-Rayet Online-only material
spellingShingle Ciencias Astronómicas
binaries
color figures
eclipsing - stars
evolution - stars
individual (HD 5980) - stars
massive - stars
Wolf-Rayet Online-only material
Koenigsberger, G.
Morrell, Nidia Irene
Hillier, D. J.
Gamen, Roberto Claudio
Schneider, F. R. N.
González Jiménez, N.
Langer, N.
Barbá, Rodolfo Héctor
The HD 5980 multiple system: masses and evolutionary status
topic_facet Ciencias Astronómicas
binaries
color figures
eclipsing - stars
evolution - stars
individual (HD 5980) - stars
massive - stars
Wolf-Rayet Online-only material
description New spectroscopic observations of the LBV/WR multiple system HD 5980 in the Small Magellanic Cloud are used to address the question of the masses and evolutionary status of the two very luminous stars in the 19.3 day eclipsing binary system. Two distinct components of the N V 4944 A˚ line are detected in emission and their radial velocity variations are used to derive masses of 61 and 66 M ⊙, under the assumption that binary interaction effects on this atomic transition are negligible. We propose that this binary system is the product of quasi-chemically homogeneous evolution with little or no mass transfer. Thus, both of these binary stars may be candidates for gamma-ray burst progenitors or even pair instability supernovae. Analysis of the photospheric absorption lines belonging to the third-light object in the system confirm that it consists of an O-type star in a 96.56 day eccentric orbit (e = 0.82) around an unseen companion. The 5:1 period ratio and high eccentricities of the two binaries suggest that they may constitute a hierarchical quadruple system.
format Articulo
Articulo
author Koenigsberger, G.
Morrell, Nidia Irene
Hillier, D. J.
Gamen, Roberto Claudio
Schneider, F. R. N.
González Jiménez, N.
Langer, N.
Barbá, Rodolfo Héctor
author_facet Koenigsberger, G.
Morrell, Nidia Irene
Hillier, D. J.
Gamen, Roberto Claudio
Schneider, F. R. N.
González Jiménez, N.
Langer, N.
Barbá, Rodolfo Héctor
author_sort Koenigsberger, G.
title The HD 5980 multiple system: masses and evolutionary status
title_short The HD 5980 multiple system: masses and evolutionary status
title_full The HD 5980 multiple system: masses and evolutionary status
title_fullStr The HD 5980 multiple system: masses and evolutionary status
title_full_unstemmed The HD 5980 multiple system: masses and evolutionary status
title_sort hd 5980 multiple system: masses and evolutionary status
publishDate 2014
url http://sedici.unlp.edu.ar/handle/10915/85133
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