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dc.contributor.author
Zorec, J.
dc.contributor.author
Fremat, Y.
dc.contributor.author
Cidale, Lydia Sonia
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dc.date.available
2018-03-23T17:08:59Z
dc.date.issued
2005-10
dc.identifier.citation
Zorec, J.; Fremat, Y.; Cidale, Lydia Sonia; On the evolutionary status of Be stars, I: field Be stars near the sun; EDP Sciences; Astronomy and Astrophysics; 441; 1; 10-2005; 235-248
dc.identifier.issn
0004-6361
dc.identifier.uri
http://hdl.handle.net/11336/39790
dc.description.abstract
A sample of 97 galactic field Be stars were studied by taking into account the effects induced by the fast rotation on their fundamental parameters. All program stars were observed in the BCD spectrophotometric system in order to minimize the perturbations produced by the circumstellar environment on the spectral photospheric signatures. This is one of the first attempts at determining stellar masses and ages by simultaneously using model atmospheres and evolutionary tracks, both calculated for rotating objects. The stellar ages (τ) normalized to the respective inferred time that each rotating star can spend in the main sequence phase (τMS) reveal a mass-dependent trend. This trend shows that: a) there are Be stars spread over the whole interval 0 ≲ τ/τMS ≲ 1 of the main sequence evolutionary phase; b) the distribution of points in the (τ/τ MS,M/M⊙) diagram indicates that in massive stars (M ≳ 12 M⊙) the Be phenomenon is present at smaller τ/τMS age ratios than for less massive stars (M ≲ 12 M⊙). This distribution can be due to: i) higher mass-loss rates in massive objets, which can act to reduce the surface fast rotation; ii) circulation time scales to transport angular momentum from the core to the surface, which are longer the lower the stellar mass. © ESO 2005.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
EDP Sciences
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dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Emission Lines
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Evolution of Stars
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Stars Rotation
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Stars Fundamental Parameters
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Be Stars
dc.subject.classification
Astronomía
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dc.subject.classification
Ciencias Físicas
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dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
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dc.title
On the evolutionary status of Be stars, I: field Be stars near the sun
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2018-03-06T15:15:09Z
dc.journal.volume
441
dc.journal.number
1
dc.journal.pagination
235-248
dc.journal.pais
Francia
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dc.journal.ciudad
Les Ulis Cedex A - France
dc.description.fil
Fil: Zorec, J.. Universite Pierre et Marie Curie; Francia
dc.description.fil
Fil: Fremat, Y.. Royal Observatory Of Belgium;
dc.description.fil
Fil: Cidale, Lydia Sonia. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina
dc.journal.title
Astronomy and Astrophysics
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://adsabs.harvard.edu/abs/2005A%26A...441..235Z
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1051/0004-6361:20053051
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://www.aanda.org/articles/aa/abs/2005/37/aa3051-05/aa3051-05.html
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