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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Autores principales: | , , , |
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Formato: | Articulo |
Lenguaje: | Inglés |
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2012
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Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/84658 |
Aporte de: |
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I19-R120-10915-84658 |
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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 |
work_keys_str_mv |
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bdutipo_str |
Repositorios |
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