The WR/LBV system HD 5980: wind-velocity – brightness correlations

The massive eclipsing system HD 5980 in the Small Magellanic Cloud presented sudden ~1–3 mag eruptive events in 1993-1994, the nature of which is still unexplained. We recently showed that these brief eruptions occurred at the beginning of an extended high state of activity which is characterized by...

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Detalles Bibliográficos
Autores principales: Koenigsberger, Gloria, Georgiev, Leonid, Hillier, D. John, Morrell, Nidia Irene, Barbá, Rodolfo Héctor, Gamen, Roberto Claudio
Formato: Articulo Comunicacion
Lenguaje:Inglés
Publicado: 2010
Materias:
Ciencias Astronómicas
binaries: eclipsing
stars: Wolf-Rayet
stars: individual (HD 5980)
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/147312
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-147312
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: eclipsing
stars: Wolf-Rayet
stars: individual (HD 5980)
spellingShingle Ciencias Astronómicas
binaries: eclipsing
stars: Wolf-Rayet
stars: individual (HD 5980)
Koenigsberger, Gloria
Georgiev, Leonid
Hillier, D. John
Morrell, Nidia Irene
Barbá, Rodolfo Héctor
Gamen, Roberto Claudio
The WR/LBV system HD 5980: wind-velocity – brightness correlations
topic_facet Ciencias Astronómicas
binaries: eclipsing
stars: Wolf-Rayet
stars: individual (HD 5980)
description The massive eclipsing system HD 5980 in the Small Magellanic Cloud presented sudden ~1–3 mag eruptive events in 1993-1994, the nature of which is still unexplained. We recently showed that these brief eruptions occurred at the beginning of an extended high state of activity which is characterized by large emission-line intensities and that this high state is currently ending (Koenigsberger et al . 2010). Star A , the more massive member of the 19-day binary, is responsible for the spectacular spectral variations observed over the past 3 decades (see Figure 1). It has a He-enriched stellar wind and is over-luminous for its mass, implying an advanced evolutionary state (Koenigsberger et al . 1998). Data obtained over the past 3 decades show that Star A's wind speed slowed down as the system brightened. Also present in these data is a correlated increase in emission-line strength, visual and UV brigthness. The latter suggests that the high activity state in HD 5980 may be attributed to a bolometric luminosity increase, consistent with the results of Drissen et al . (2001). Hence, HD 5980 may be providing the important clues needed for understanding the behavior of other luminous blue variables and for understainding the evolutionary transition between massive O-type stars and Wolf-Rayet stars.
format Articulo
Comunicacion
author Koenigsberger, Gloria
Georgiev, Leonid
Hillier, D. John
Morrell, Nidia Irene
Barbá, Rodolfo Héctor
Gamen, Roberto Claudio
author_facet Koenigsberger, Gloria
Georgiev, Leonid
Hillier, D. John
Morrell, Nidia Irene
Barbá, Rodolfo Héctor
Gamen, Roberto Claudio
author_sort Koenigsberger, Gloria
title The WR/LBV system HD 5980: wind-velocity – brightness correlations
title_short The WR/LBV system HD 5980: wind-velocity – brightness correlations
title_full The WR/LBV system HD 5980: wind-velocity – brightness correlations
title_fullStr The WR/LBV system HD 5980: wind-velocity – brightness correlations
title_full_unstemmed The WR/LBV system HD 5980: wind-velocity – brightness correlations
title_sort wr/lbv system hd 5980: wind-velocity – brightness correlations
publishDate 2010
url http://sedici.unlp.edu.ar/handle/10915/147312
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