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dc.contributor.author
Zorec, J.  
dc.contributor.author
Fremat, Y  
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Domiciano de Souza, A.  
dc.contributor.author
Royer, F.  
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Cidale, Lydia Sonia  
dc.contributor.author
Hubert, A.-M.  
dc.contributor.author
Semaan, T.  
dc.contributor.author
Martayan, C  
dc.contributor.author
Cochetti, Yanina Roxana  
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Arias, M. L.  
dc.contributor.author
Aidelman, Yael Judith  
dc.contributor.author
Stee, P.  
dc.date.available
2018-03-06T15:20:34Z  
dc.date.issued
2016-11  
dc.identifier.citation
Zorec, J.; Fremat, Y; Domiciano de Souza, A.; Royer, F.; Cidale, Lydia Sonia; et al.; Critical study of the distribution of rotational velocities of Be stars, I : deconvolution methods, effects due to gravity darkening, macroturbulence, and binarity; EDP Sciences; Astronomy and Astrophysics; 595; 595; 11-2016; A132  
dc.identifier.issn
0004-6361  
dc.identifier.uri
http://hdl.handle.net/11336/37946  
dc.description.abstract
Context. Among intermediate-mass and massive stars, Be stars are the fastest rotators in the main sequence (MS) and, as such, these stars are a cornerstone to validate models of structure and evolution of rotating stars. Several phenomena, however, induce under- or overestimations either of their apparent Vsini, or true velocity V.Aims. In the present contribution we aim at obtaining distributions of true rotational velocities corrected for systematic effects induced by the rapid rotation itself, macroturbulent velocities, and binarity.Methods. We study a set of 233 Be stars by assuming they have inclination angles distributed at random. We critically discuss the methods of Cranmer and Lucy-Richardson, which enable us to transform a distribution of projected velocities into another distribution of true rotational velocities, where the gravitational darkening effect on the Vsini parameter is considered in different ways. We conclude that iterative algorithm by Lucy-Richardson responds at best to the purposes of the present work, but it requires a thorough determination of the stellar fundamental parameters.Results. We conclude that once the mode of ratios of the true velocities of Be stars attains the value V/Vc ≃ 0.77 in the main-sequence (MS) evolutionary phase, it remains unchanged up to the end of the MS lifespan. The statistical corrections found on the distribution of ratios V/Vc for overestimations of Vsini, due to macroturbulent motions and binarity, produce a shift of this distribution toward lower values of V/Vc when Be stars in all MS evolutionary stages are considered together. The mode of the final distribution obtained is at V/Vc ≃ 0.65. This distribution has a nearly symmetric distribution and shows that the Be phenomenon is characterized by a wide range of true velocity ratios 0.3 ≲ V/Vc ≲ 0.95. It thus suggests that the probability that Be stars are critical rotators is extremely low.Conclusions. The corrections attempted in the present work represent an initial step to infer indications about the nature of the Be-star surface rotation that will be studied in the second paper of this series.  
dc.format
application/pdf  
dc.language.iso
eng  
dc.publisher
EDP Sciences  
dc.rights
info:eu-repo/semantics/openAccess  
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/  
dc.subject
Emission Line  
dc.subject
Be Stars  
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Rotation  
dc.subject.classification
Astronomía  
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Ciencias Físicas  
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CIENCIAS NATURALES Y EXACTAS  
dc.title
Critical study of the distribution of rotational velocities of Be stars, I : deconvolution methods, effects due to gravity darkening, macroturbulence, and binarity  
dc.type
info:eu-repo/semantics/article  
dc.type
info:ar-repo/semantics/artículo  
dc.type
info:eu-repo/semantics/publishedVersion  
dc.date.updated
2018-02-07T17:03:07Z  
dc.journal.volume
595  
dc.journal.number
595  
dc.journal.pagination
A132  
dc.journal.pais
Francia  
dc.journal.ciudad
Paris  
dc.description.fil
Fil: Zorec, J.. Institut d’Astrophysique de Paris; Francia  
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Fil: Fremat, Y. Institut d’Astrophysique de Paris; Francia  
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Fil: Domiciano de Souza, A.. Observatoire de la Côte d’Azur; Francia  
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Fil: Royer, F.. Université Paris Diderot - Paris 7; Francia  
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Fil: Cidale, Lydia Sonia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; Argentina. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina  
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Fil: Hubert, A.-M.. Université Paris Diderot - Paris 7; Francia  
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Fil: Semaan, T.. University of Geneva; Suiza  
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Fil: Martayan, C. European Organization for Astronomical Research in the Southern Hemisphere; Chile  
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Fil: Cochetti, Yanina Roxana. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; Argentina. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina  
dc.description.fil
Fil: Arias, M. L.. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; Argentina. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina  
dc.description.fil
Fil: Aidelman, Yael Judith. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; Argentina. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina  
dc.description.fil
Fil: Stee, P.. Observatoire de la Côte d’Azur; Francia  
dc.journal.title
Astronomy and Astrophysics  
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1051/0004-6361/201628760  
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://www.aanda.org/articles/aa/abs/2016/11/aa28760-16/aa28760-16.html