Rapid Evolutionary Changes in the WR Binary HD 5980

Observations of the optical spectrum of the Wolf-Rayet eclipsing binary HD 5980 in the Small Magellanic Cloud show how one component of this binary system unexpectedly underwent an eruption transforming its spectral type from a hot WN3 to a cooler and more luminous WN11 type. Radial velocity analysi...

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Detalles Bibliográficos
Autores principales: Niemelä, Virpi Sinikka, Barbá, Rodolfo Héctor, Morrell, Nidia Irene
Formato: Articulo Comunicacion
Lenguaje:Inglés
Publicado: 1998
Materias:
Astronomía
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/133944
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-133944
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Astronomía
spellingShingle Astronomía
Niemelä, Virpi Sinikka
Barbá, Rodolfo Héctor
Morrell, Nidia Irene
Rapid Evolutionary Changes in the WR Binary HD 5980
topic_facet Astronomía
description Observations of the optical spectrum of the Wolf-Rayet eclipsing binary HD 5980 in the Small Magellanic Cloud show how one component of this binary system unexpectedly underwent an eruption transforming its spectral type from a hot WN3 to a cooler and more luminous WN11 type. Radial velocity analysis of the preoutburst spectra indicates that both components of the binary are massive stars with emission lines in their spectra. The component that erupted is found to be the one in front of the system during the light curve phase zero. Differential analysis of the H Balmer and He ii Pickering emission line strengths indicates that the hydrogen content changes with the cooling of the spectrum. The maximum light of the eruption of HD 5980 had a duration of a few months, but the slow change from a WNE spectrum to WNL type took about 10 years. The similarity of the present spectrum of HD 5980 to the galactic WR binary system WR 12 is noticed.
format Articulo
Comunicacion
author Niemelä, Virpi Sinikka
Barbá, Rodolfo Héctor
Morrell, Nidia Irene
author_facet Niemelä, Virpi Sinikka
Barbá, Rodolfo Héctor
Morrell, Nidia Irene
author_sort Niemelä, Virpi Sinikka
title Rapid Evolutionary Changes in the WR Binary HD 5980
title_short Rapid Evolutionary Changes in the WR Binary HD 5980
title_full Rapid Evolutionary Changes in the WR Binary HD 5980
title_fullStr Rapid Evolutionary Changes in the WR Binary HD 5980
title_full_unstemmed Rapid Evolutionary Changes in the WR Binary HD 5980
title_sort rapid evolutionary changes in the wr binary hd 5980
publishDate 1998
url http://sedici.unlp.edu.ar/handle/10915/133944
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