A new observational tracer for high-density disc-like structures around B[e] supergiants

The disc formation mechanism of B[e] supergiants is one of the puzzling phenomena in massive star evolution. Rapid stellar rotation seems to play an important role for the non-spherically symmetric mass-loss leading to a high-density disc- or ring-like structure of neutral material around these mass...

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Detalles Bibliográficos
Autores principales: Aret, A., Kraus, M., Muratore, María Florencia, Borges Fernandes, M.
Formato: Articulo
Lenguaje:Inglés
Publicado: 2012
Materias:
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/84658
Aporte de:
id I19-R120-10915-84658
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
Circumstellar matter
Stars: emission line, Be
Stars: winds, outflows
Supergiants
spellingShingle Ciencias Astronómicas
Circumstellar matter
Stars: emission line, Be
Stars: winds, outflows
Supergiants
Aret, A.
Kraus, M.
Muratore, María Florencia
Borges Fernandes, M.
A new observational tracer for high-density disc-like structures around B[e] supergiants
topic_facet Ciencias Astronómicas
Circumstellar matter
Stars: emission line, Be
Stars: winds, outflows
Supergiants
description The disc formation mechanism of B[e] supergiants is one of the puzzling phenomena in massive star evolution. Rapid stellar rotation seems to play an important role for the non-spherically symmetric mass-loss leading to a high-density disc- or ring-like structure of neutral material around these massive and luminous objects. The radial density and temperature structure as well as the kinematics within this high-density material are, however, not well studied. Based on the high-resolution optical spectra of a sample of B[e] supergiants in the Magellanic Clouds we especially searched for tracers of the kinematics within their discs. Besides the well-known [Oi] lines, we discovered the [Caii] λλ7291, 7324 lines which can be used as a complementary set of disc tracers. We find that these lines originate from very high density regions, located closer to the star than the [Oi] λ5577 line-forming region. The line profiles of both the [Oi] and the [Caii] lines indicate that the discs or rings of high-density material are in Keplerian rotation. We estimate plausible ranges of disc inclination angles for the sample of B[e] supergiants and suggest that the star LHA120-S22 might have a spiral arm rather than a disc.
format Articulo
Articulo
author Aret, A.
Kraus, M.
Muratore, María Florencia
Borges Fernandes, M.
author_facet Aret, A.
Kraus, M.
Muratore, María Florencia
Borges Fernandes, M.
author_sort Aret, A.
title A new observational tracer for high-density disc-like structures around B[e] supergiants
title_short A new observational tracer for high-density disc-like structures around B[e] supergiants
title_full A new observational tracer for high-density disc-like structures around B[e] supergiants
title_fullStr A new observational tracer for high-density disc-like structures around B[e] supergiants
title_full_unstemmed A new observational tracer for high-density disc-like structures around B[e] supergiants
title_sort new observational tracer for high-density disc-like structures around b[e] supergiants
publishDate 2012
url http://sedici.unlp.edu.ar/handle/10915/84658
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