Modelling chromospheric line profiles in NGC 2808: evidence of mass loss from RGB stars

Autores
Mauas, Pablo Jacobo David; Cacciari, C.; Pasquini, L.
Año de publicación
2006
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
In this study we test the possibility that the asymmetry in the profiles of the Hα and Ca ii K lines in red giant stars is due to the presence of an active chromosphere rather than to mass loss. To this end, we compare line profiles computed using relevant model chromospheres to profiles of the Hα and Ca ii K lines observed in five red giant stars of the globular cluster NGC 2808. The spectra were taken with FLAMES during the science verification, using the UVES mode at high resolution ( 000) for the Hα line, and GIRAFFE in MEDUSA mode () for the Ca ii K line. We find that the observed profiles are better described if a negative (outward) velocity field is included in the model chromospheres. This leads to mass loss rates of a few 10-9  yr-1, so very close to the requirements of the stellar evolution theory.

Fil: Mauas, Pablo Jacobo David. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; Argentina
Fil: Cacciari, C.. Observatoire Astronomico di Bologna; Italia
Fil: Pasquini, L.. European Southern Observatory; Alemania
Materia
Astrophysics
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/16674
Acceder
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network_name_str CONICET Digital (CONICET)
spelling Modelling chromospheric line profiles in NGC 2808: evidence of mass loss from RGB starsMauas, Pablo Jacobo DavidCacciari, C.Pasquini, L.Astrophysicshttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1In this study we test the possibility that the asymmetry in the profiles of the Hα and Ca ii K lines in red giant stars is due to the presence of an active chromosphere rather than to mass loss. To this end, we compare line profiles computed using relevant model chromospheres to profiles of the Hα and Ca ii K lines observed in five red giant stars of the globular cluster NGC 2808. The spectra were taken with FLAMES during the science verification, using the UVES mode at high resolution ( 000) for the Hα line, and GIRAFFE in MEDUSA mode () for the Ca ii K line. We find that the observed profiles are better described if a negative (outward) velocity field is included in the model chromospheres. This leads to mass loss rates of a few 10-9  yr-1, so very close to the requirements of the stellar evolution theory.
Fil: Mauas, Pablo Jacobo David. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; ArgentinaFil: Cacciari, C.. Observatoire Astronomico di Bologna; ItaliaFil: Pasquini, L.. European Southern Observatory; AlemaniaEdp Sciences2006-08info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/16674Mauas, Pablo Jacobo David; Cacciari, C.; Pasquini, L.; Modelling chromospheric line profiles in NGC 2808: evidence of mass loss from RGB stars; Edp Sciences; Astronomy And Astrophysics; 454; 2; 8-2006; 609-6150004-6361enginfo:eu-repo/semantics/altIdentifier/url/https://www.aanda.org/articles/aa/abs/2006/29/aa4792-05/aa4792-05.htmlinfo:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361:20054792info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-10-22T11:07:26Zoai:ri.conicet.gov.ar:11336/16674instacron: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:34982025-10-22 11:07:26.415CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Modelling chromospheric line profiles in NGC 2808: evidence of mass loss from RGB stars
title Modelling chromospheric line profiles in NGC 2808: evidence of mass loss from RGB stars
spellingShingle Modelling chromospheric line profiles in NGC 2808: evidence of mass loss from RGB stars
Mauas, Pablo Jacobo David
Astrophysics
title_short Modelling chromospheric line profiles in NGC 2808: evidence of mass loss from RGB stars
title_full Modelling chromospheric line profiles in NGC 2808: evidence of mass loss from RGB stars
title_fullStr Modelling chromospheric line profiles in NGC 2808: evidence of mass loss from RGB stars
title_full_unstemmed Modelling chromospheric line profiles in NGC 2808: evidence of mass loss from RGB stars
title_sort Modelling chromospheric line profiles in NGC 2808: evidence of mass loss from RGB stars
dc.creator.none.fl_str_mv Mauas, Pablo Jacobo David
Cacciari, C.
Pasquini, L.
author Mauas, Pablo Jacobo David
author_facet Mauas, Pablo Jacobo David
Cacciari, C.
Pasquini, L.
author_role author
author2 Cacciari, C.
Pasquini, L.
author2_role author
author
dc.subject.none.fl_str_mv Astrophysics
topic Astrophysics
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv In this study we test the possibility that the asymmetry in the profiles of the Hα and Ca ii K lines in red giant stars is due to the presence of an active chromosphere rather than to mass loss. To this end, we compare line profiles computed using relevant model chromospheres to profiles of the Hα and Ca ii K lines observed in five red giant stars of the globular cluster NGC 2808. The spectra were taken with FLAMES during the science verification, using the UVES mode at high resolution ( 000) for the Hα line, and GIRAFFE in MEDUSA mode () for the Ca ii K line. We find that the observed profiles are better described if a negative (outward) velocity field is included in the model chromospheres. This leads to mass loss rates of a few 10-9  yr-1, so very close to the requirements of the stellar evolution theory.

Fil: Mauas, Pablo Jacobo David. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; Argentina
Fil: Cacciari, C.. Observatoire Astronomico di Bologna; Italia
Fil: Pasquini, L.. European Southern Observatory; Alemania
description In this study we test the possibility that the asymmetry in the profiles of the Hα and Ca ii K lines in red giant stars is due to the presence of an active chromosphere rather than to mass loss. To this end, we compare line profiles computed using relevant model chromospheres to profiles of the Hα and Ca ii K lines observed in five red giant stars of the globular cluster NGC 2808. The spectra were taken with FLAMES during the science verification, using the UVES mode at high resolution ( 000) for the Hα line, and GIRAFFE in MEDUSA mode () for the Ca ii K line. We find that the observed profiles are better described if a negative (outward) velocity field is included in the model chromospheres. This leads to mass loss rates of a few 10-9  yr-1, so very close to the requirements of the stellar evolution theory.

publishDate 2006
dc.date.none.fl_str_mv 2006-08
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/11336/16674
Mauas, Pablo Jacobo David; Cacciari, C.; Pasquini, L.; Modelling chromospheric line profiles in NGC 2808: evidence of mass loss from RGB stars; Edp Sciences; Astronomy And Astrophysics; 454; 2; 8-2006; 609-615
0004-6361
url http://hdl.handle.net/11336/16674
identifier_str_mv Mauas, Pablo Jacobo David; Cacciari, C.; Pasquini, L.; Modelling chromospheric line profiles in NGC 2808: evidence of mass loss from RGB stars; Edp Sciences; Astronomy And Astrophysics; 454; 2; 8-2006; 609-615
0004-6361
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/https://www.aanda.org/articles/aa/abs/2006/29/aa4792-05/aa4792-05.html
info:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361:20054792
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/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 12.982451

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