Differential rotation in rapidly rotating early-type stars. I: motivations for combined spectroscopic and interferometric studies.

Autores
Zorec , J.; Frémat , Y.; Dominiciano de Souza, A.; Delaa, O.; Stee, P.; Mourard, D.; Cidale, Lydia Sonia; Martayan, C.; Georgy, C.; Ekstrom, S.
Año de publicación
2011
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Context. Since the external regions of the envelopes of rapidly rotating early-type stars are unstable to convection, a coupling may exist between the convection and the internal rotation. Aims. We explore what can be learned from spectroscopic and interferometric observations about the properties of the rotation law in the external layers of these objects. Methods. Using simple relations between the entropy and specific rotational quantities, some of which are found to be efficient at accounting for the solar differential rotation in the convective region, we derived analytical solutions that represent possible differential rotations in the envelope of early-type stars. A surface latitudinal differential rotation may not only be an external imprint of the inner rotation, but induces changes in the stellar geometry, the gravitational darkening, the aspect of spectral line profiles, and the emitted spectral energy distribution. Results. By studying the equation of the surface of stars with non-conservative rotation laws, we conclude that objects undergo geometrical deformations that are a function of the latitudinal differential rotation able to be scrutinized both spectroscopically and by interferometry. The combination of Fourier analysis of spectral lines with model atmospheres provides independent estimates of the surface latitudinal differential rotation and the inclination angle. Models of stars at different evolutionary stages rotating with internal conservative rotation laws were calculated to show that the Roche approximation can be safely used to account for the gravitational potential. The surface temperature gradient in rapid rotators induce an acceleration to the surface angular velocity. Although a nonzero differential rotation parameter may indicate that the rotation is neither rigid nor shellular underneath the stellar surface, still further information, perhaps non-radial pulsations, is needed to determine its characteristics as a function of depth.
Fil: Zorec , J.. Institut Dastrophysique de Paris; Francia
Fil: Frémat , Y.. Royal Observatory Of Belgium; Bélgica
Fil: Dominiciano de Souza, A.. Laboratoire Fizeau; Francia
Fil: Delaa, O.. Laboratoire Fizeau; Francia
Fil: Stee, P.. Laboratoire Fizeau; Francia
Fil: Mourard, D.. Laboratoire Fizeau; Francia
Fil: Cidale, Lydia Sonia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico La Plata. Instituto de Astrofísica de La Plata; Argentina. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina
Fil: Martayan, C.. European Organization for Astronomical Research in the Southern Hemisphere; Chile
Fil: Georgy, C.. Université de Genève. Observatoire de Genève; Suiza
Fil: Ekstrom, S.. Université de Genève. Observatoire de Genève; Suiza
Materia
Early type stars
Rotation of stars
Interferometric techniques
Spectroscopic techniques
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/10278
Acceder
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network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Differential rotation in rapidly rotating early-type stars. I: motivations for combined spectroscopic and interferometric studies.Zorec , J.Frémat , Y.Dominiciano de Souza, A.Delaa, O.Stee, P.Mourard, D.Cidale, Lydia SoniaMartayan, C.Georgy, C.Ekstrom, S.Early type starsRotation of starsInterferometric techniquesSpectroscopic techniqueshttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1Context. Since the external regions of the envelopes of rapidly rotating early-type stars are unstable to convection, a coupling may exist between the convection and the internal rotation. Aims. We explore what can be learned from spectroscopic and interferometric observations about the properties of the rotation law in the external layers of these objects. Methods. Using simple relations between the entropy and specific rotational quantities, some of which are found to be efficient at accounting for the solar differential rotation in the convective region, we derived analytical solutions that represent possible differential rotations in the envelope of early-type stars. A surface latitudinal differential rotation may not only be an external imprint of the inner rotation, but induces changes in the stellar geometry, the gravitational darkening, the aspect of spectral line profiles, and the emitted spectral energy distribution. Results. By studying the equation of the surface of stars with non-conservative rotation laws, we conclude that objects undergo geometrical deformations that are a function of the latitudinal differential rotation able to be scrutinized both spectroscopically and by interferometry. The combination of Fourier analysis of spectral lines with model atmospheres provides independent estimates of the surface latitudinal differential rotation and the inclination angle. Models of stars at different evolutionary stages rotating with internal conservative rotation laws were calculated to show that the Roche approximation can be safely used to account for the gravitational potential. The surface temperature gradient in rapid rotators induce an acceleration to the surface angular velocity. Although a nonzero differential rotation parameter may indicate that the rotation is neither rigid nor shellular underneath the stellar surface, still further information, perhaps non-radial pulsations, is needed to determine its characteristics as a function of depth.Fil: Zorec , J.. Institut Dastrophysique de Paris; FranciaFil: Frémat , Y.. Royal Observatory Of Belgium; BélgicaFil: Dominiciano de Souza, A.. Laboratoire Fizeau; FranciaFil: Delaa, O.. Laboratoire Fizeau; FranciaFil: Stee, P.. Laboratoire Fizeau; FranciaFil: Mourard, D.. Laboratoire Fizeau; FranciaFil: Cidale, Lydia Sonia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico La Plata. Instituto de Astrofísica de La Plata; Argentina. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; ArgentinaFil: Martayan, C.. European Organization for Astronomical Research in the Southern Hemisphere; ChileFil: Georgy, C.. Université de Genève. Observatoire de Genève; SuizaFil: Ekstrom, S.. Université de Genève. Observatoire de Genève; SuizaEdp Sciences2011-02info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/10278Zorec , J.; Frémat , Y.; Dominiciano de Souza, A.; Delaa, O.; Stee, P.; et al.; Differential rotation in rapidly rotating early-type stars. I: motivations for combined spectroscopic and interferometric studies.; Edp Sciences; Astronomy And Astrophysics; 526; a87; 2-2011; 1-250004-6361enginfo:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361/201015691info:eu-repo/semantics/altIdentifier/url/http://www.aanda.org/articles/aa/abs/2011/02/aa15691-10/aa15691-10.htmlinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T09:33:22Zoai:ri.conicet.gov.ar:11336/10278instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-29 09:33:23.158CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Differential rotation in rapidly rotating early-type stars. I: motivations for combined spectroscopic and interferometric studies.
title Differential rotation in rapidly rotating early-type stars. I: motivations for combined spectroscopic and interferometric studies.
spellingShingle Differential rotation in rapidly rotating early-type stars. I: motivations for combined spectroscopic and interferometric studies.
Zorec , J.
Early type stars
Rotation of stars
Interferometric techniques
Spectroscopic techniques
title_short Differential rotation in rapidly rotating early-type stars. I: motivations for combined spectroscopic and interferometric studies.
title_full Differential rotation in rapidly rotating early-type stars. I: motivations for combined spectroscopic and interferometric studies.
title_fullStr Differential rotation in rapidly rotating early-type stars. I: motivations for combined spectroscopic and interferometric studies.
title_full_unstemmed Differential rotation in rapidly rotating early-type stars. I: motivations for combined spectroscopic and interferometric studies.
title_sort Differential rotation in rapidly rotating early-type stars. I: motivations for combined spectroscopic and interferometric studies.
dc.creator.none.fl_str_mv Zorec , J.
Frémat , Y.
Dominiciano de Souza, A.
Delaa, O.
Stee, P.
Mourard, D.
Cidale, Lydia Sonia
Martayan, C.
Georgy, C.
Ekstrom, S.
author Zorec , J.
author_facet Zorec , J.
Frémat , Y.
Dominiciano de Souza, A.
Delaa, O.
Stee, P.
Mourard, D.
Cidale, Lydia Sonia
Martayan, C.
Georgy, C.
Ekstrom, S.
author_role author
author2 Frémat , Y.
Dominiciano de Souza, A.
Delaa, O.
Stee, P.
Mourard, D.
Cidale, Lydia Sonia
Martayan, C.
Georgy, C.
Ekstrom, S.
author2_role author
author
author
author
author
author
author
author
author
dc.subject.none.fl_str_mv Early type stars
Rotation of stars
Interferometric techniques
Spectroscopic techniques
topic Early type stars
Rotation of stars
Interferometric techniques
Spectroscopic techniques
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Context. Since the external regions of the envelopes of rapidly rotating early-type stars are unstable to convection, a coupling may exist between the convection and the internal rotation. Aims. We explore what can be learned from spectroscopic and interferometric observations about the properties of the rotation law in the external layers of these objects. Methods. Using simple relations between the entropy and specific rotational quantities, some of which are found to be efficient at accounting for the solar differential rotation in the convective region, we derived analytical solutions that represent possible differential rotations in the envelope of early-type stars. A surface latitudinal differential rotation may not only be an external imprint of the inner rotation, but induces changes in the stellar geometry, the gravitational darkening, the aspect of spectral line profiles, and the emitted spectral energy distribution. Results. By studying the equation of the surface of stars with non-conservative rotation laws, we conclude that objects undergo geometrical deformations that are a function of the latitudinal differential rotation able to be scrutinized both spectroscopically and by interferometry. The combination of Fourier analysis of spectral lines with model atmospheres provides independent estimates of the surface latitudinal differential rotation and the inclination angle. Models of stars at different evolutionary stages rotating with internal conservative rotation laws were calculated to show that the Roche approximation can be safely used to account for the gravitational potential. The surface temperature gradient in rapid rotators induce an acceleration to the surface angular velocity. Although a nonzero differential rotation parameter may indicate that the rotation is neither rigid nor shellular underneath the stellar surface, still further information, perhaps non-radial pulsations, is needed to determine its characteristics as a function of depth.
Fil: Zorec , J.. Institut Dastrophysique de Paris; Francia
Fil: Frémat , Y.. Royal Observatory Of Belgium; Bélgica
Fil: Dominiciano de Souza, A.. Laboratoire Fizeau; Francia
Fil: Delaa, O.. Laboratoire Fizeau; Francia
Fil: Stee, P.. Laboratoire Fizeau; Francia
Fil: Mourard, D.. Laboratoire Fizeau; Francia
Fil: Cidale, Lydia Sonia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico La Plata. Instituto de Astrofísica de La Plata; Argentina. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina
Fil: Martayan, C.. European Organization for Astronomical Research in the Southern Hemisphere; Chile
Fil: Georgy, C.. Université de Genève. Observatoire de Genève; Suiza
Fil: Ekstrom, S.. Université de Genève. Observatoire de Genève; Suiza
description Context. Since the external regions of the envelopes of rapidly rotating early-type stars are unstable to convection, a coupling may exist between the convection and the internal rotation. Aims. We explore what can be learned from spectroscopic and interferometric observations about the properties of the rotation law in the external layers of these objects. Methods. Using simple relations between the entropy and specific rotational quantities, some of which are found to be efficient at accounting for the solar differential rotation in the convective region, we derived analytical solutions that represent possible differential rotations in the envelope of early-type stars. A surface latitudinal differential rotation may not only be an external imprint of the inner rotation, but induces changes in the stellar geometry, the gravitational darkening, the aspect of spectral line profiles, and the emitted spectral energy distribution. Results. By studying the equation of the surface of stars with non-conservative rotation laws, we conclude that objects undergo geometrical deformations that are a function of the latitudinal differential rotation able to be scrutinized both spectroscopically and by interferometry. The combination of Fourier analysis of spectral lines with model atmospheres provides independent estimates of the surface latitudinal differential rotation and the inclination angle. Models of stars at different evolutionary stages rotating with internal conservative rotation laws were calculated to show that the Roche approximation can be safely used to account for the gravitational potential. The surface temperature gradient in rapid rotators induce an acceleration to the surface angular velocity. Although a nonzero differential rotation parameter may indicate that the rotation is neither rigid nor shellular underneath the stellar surface, still further information, perhaps non-radial pulsations, is needed to determine its characteristics as a function of depth.
publishDate 2011
dc.date.none.fl_str_mv 2011-02
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/10278
Zorec , J.; Frémat , Y.; Dominiciano de Souza, A.; Delaa, O.; Stee, P.; et al.; Differential rotation in rapidly rotating early-type stars. I: motivations for combined spectroscopic and interferometric studies.; Edp Sciences; Astronomy And Astrophysics; 526; a87; 2-2011; 1-25
0004-6361
url http://hdl.handle.net/11336/10278
identifier_str_mv Zorec , J.; Frémat , Y.; Dominiciano de Souza, A.; Delaa, O.; Stee, P.; et al.; Differential rotation in rapidly rotating early-type stars. I: motivations for combined spectroscopic and interferometric studies.; Edp Sciences; Astronomy And Astrophysics; 526; a87; 2-2011; 1-25
0004-6361
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361/201015691
info:eu-repo/semantics/altIdentifier/url/http://www.aanda.org/articles/aa/abs/2011/02/aa15691-10/aa15691-10.html
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv Edp Sciences
publisher.none.fl_str_mv Edp Sciences
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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score 13.070432

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