Atmospheric models of He-peculiar stars: synthetic He I line profiles and absolute visual magnitudes

Autores
Vallverdú, Rodolfo; Cidale, Lydia Sonia; Rohrmann, Rene Daniel; Ringuelet, Adela Emilia
Año de publicación
2014
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
We analyze the influence of magnetic pressure effects on the atmospheric structure of B peculiar type stars, as well as, on the emergent He I line profiles and absolute visual magnitudes. We consider a photosphere in local thermodynamic and hydrostatic equilibrium. The hydrostatic equilibrium equation is modified to include the Lorentz force. Atomic occupational numbers are computed in LTE considering non-ideal effects in the gas equation of state. We depict the influence of a magnetic field on local He I line profiles and discuss the effects of the helium abundance in magnetic B-type stars. The Lorentz force might explain local variations up to 7 % in the equivalent width of helium lines, while local enhancements of He chemical abundances would produce larger changes. To analyze the line variations in real stars we computed the net contribution of a bipolar magnetic field over the stellar disk. The resulting disk-averaged magnetic field predicts variations with the rotation phase up to 2-3 % in the line EWs for a dipolar magnetic field of 1000 G.
Fil: Vallverdú, Rodolfo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico La Plata. Instituto de Astrofísica de La Plata; Argentina; Argentina. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina
Fil: Cidale, Lydia Sonia. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico La Plata. Instituto de Astrofísica de La Plata; Argentina; Argentina
Fil: Rohrmann, Rene Daniel. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnologico San Juan. Instituto de Ciencias Astronomicas de la Tierra y del Espacio; Argentina
Fil: Ringuelet, Adela Emilia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico la Plata. Instituto de Astrofísica de la Plata; Argentina; Argentina. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina
Materia
Magnetic Fields
Chemically Peculiar Stars
Early-Type Stars
Atmospheres
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:11336/15044
Acceder
id CONICETDig_7be5cb3830281add4668bbebfb448989
oai_identifier_str oai:ri.conicet.gov.ar:11336/15044
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Atmospheric models of He-peculiar stars: synthetic He I line profiles and absolute visual magnitudesVallverdú, RodolfoCidale, Lydia SoniaRohrmann, Rene DanielRinguelet, Adela EmiliaMagnetic FieldsChemically Peculiar StarsEarly-Type StarsAtmosphereshttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1We analyze the influence of magnetic pressure effects on the atmospheric structure of B peculiar type stars, as well as, on the emergent He I line profiles and absolute visual magnitudes. We consider a photosphere in local thermodynamic and hydrostatic equilibrium. The hydrostatic equilibrium equation is modified to include the Lorentz force. Atomic occupational numbers are computed in LTE considering non-ideal effects in the gas equation of state. We depict the influence of a magnetic field on local He I line profiles and discuss the effects of the helium abundance in magnetic B-type stars. The Lorentz force might explain local variations up to 7 % in the equivalent width of helium lines, while local enhancements of He chemical abundances would produce larger changes. To analyze the line variations in real stars we computed the net contribution of a bipolar magnetic field over the stellar disk. The resulting disk-averaged magnetic field predicts variations with the rotation phase up to 2-3 % in the line EWs for a dipolar magnetic field of 1000 G.Fil: Vallverdú, Rodolfo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico La Plata. Instituto de Astrofísica de La Plata; Argentina; Argentina. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; ArgentinaFil: Cidale, Lydia Sonia. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico La Plata. Instituto de Astrofísica de La Plata; Argentina; ArgentinaFil: Rohrmann, Rene Daniel. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnologico San Juan. Instituto de Ciencias Astronomicas de la Tierra y del Espacio; ArgentinaFil: Ringuelet, Adela Emilia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico la Plata. Instituto de Astrofísica de la Plata; Argentina; Argentina. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; ArgentinaSpringer2014-03info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/15044Vallverdú, Rodolfo; Cidale, Lydia Sonia; Rohrmann, Rene Daniel; Ringuelet, Adela Emilia; Atmospheric models of He-peculiar stars: synthetic He I line profiles and absolute visual magnitudes; Springer; Astrophysics And Space Science; 352; 1; 3-2014; 95-1020004-640Xenginfo:eu-repo/semantics/altIdentifier/url/https://link.springer.com/article/10.1007/s10509-014-1886-yinfo:eu-repo/semantics/altIdentifier/doi/10.1007/s10509-014-1886-yinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-10-22T11:33:22Zoai:ri.conicet.gov.ar:11336/15044instacron: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 11:33:22.845CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Atmospheric models of He-peculiar stars: synthetic He I line profiles and absolute visual magnitudes
title Atmospheric models of He-peculiar stars: synthetic He I line profiles and absolute visual magnitudes
spellingShingle Atmospheric models of He-peculiar stars: synthetic He I line profiles and absolute visual magnitudes
Vallverdú, Rodolfo
Magnetic Fields
Chemically Peculiar Stars
Early-Type Stars
Atmospheres
title_short Atmospheric models of He-peculiar stars: synthetic He I line profiles and absolute visual magnitudes
title_full Atmospheric models of He-peculiar stars: synthetic He I line profiles and absolute visual magnitudes
title_fullStr Atmospheric models of He-peculiar stars: synthetic He I line profiles and absolute visual magnitudes
title_full_unstemmed Atmospheric models of He-peculiar stars: synthetic He I line profiles and absolute visual magnitudes
title_sort Atmospheric models of He-peculiar stars: synthetic He I line profiles and absolute visual magnitudes
dc.creator.none.fl_str_mv Vallverdú, Rodolfo
Cidale, Lydia Sonia
Rohrmann, Rene Daniel
Ringuelet, Adela Emilia
author Vallverdú, Rodolfo
author_facet Vallverdú, Rodolfo
Cidale, Lydia Sonia
Rohrmann, Rene Daniel
Ringuelet, Adela Emilia
author_role author
author2 Cidale, Lydia Sonia
Rohrmann, Rene Daniel
Ringuelet, Adela Emilia
author2_role author
author
author
dc.subject.none.fl_str_mv Magnetic Fields
Chemically Peculiar Stars
Early-Type Stars
Atmospheres
topic Magnetic Fields
Chemically Peculiar Stars
Early-Type Stars
Atmospheres
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv We analyze the influence of magnetic pressure effects on the atmospheric structure of B peculiar type stars, as well as, on the emergent He I line profiles and absolute visual magnitudes. We consider a photosphere in local thermodynamic and hydrostatic equilibrium. The hydrostatic equilibrium equation is modified to include the Lorentz force. Atomic occupational numbers are computed in LTE considering non-ideal effects in the gas equation of state. We depict the influence of a magnetic field on local He I line profiles and discuss the effects of the helium abundance in magnetic B-type stars. The Lorentz force might explain local variations up to 7 % in the equivalent width of helium lines, while local enhancements of He chemical abundances would produce larger changes. To analyze the line variations in real stars we computed the net contribution of a bipolar magnetic field over the stellar disk. The resulting disk-averaged magnetic field predicts variations with the rotation phase up to 2-3 % in the line EWs for a dipolar magnetic field of 1000 G.
Fil: Vallverdú, Rodolfo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico La Plata. Instituto de Astrofísica de La Plata; Argentina; Argentina. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina
Fil: Cidale, Lydia Sonia. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico La Plata. Instituto de Astrofísica de La Plata; Argentina; Argentina
Fil: Rohrmann, Rene Daniel. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnologico San Juan. Instituto de Ciencias Astronomicas de la Tierra y del Espacio; Argentina
Fil: Ringuelet, Adela Emilia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico la Plata. Instituto de Astrofísica de la Plata; Argentina; Argentina. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina
description We analyze the influence of magnetic pressure effects on the atmospheric structure of B peculiar type stars, as well as, on the emergent He I line profiles and absolute visual magnitudes. We consider a photosphere in local thermodynamic and hydrostatic equilibrium. The hydrostatic equilibrium equation is modified to include the Lorentz force. Atomic occupational numbers are computed in LTE considering non-ideal effects in the gas equation of state. We depict the influence of a magnetic field on local He I line profiles and discuss the effects of the helium abundance in magnetic B-type stars. The Lorentz force might explain local variations up to 7 % in the equivalent width of helium lines, while local enhancements of He chemical abundances would produce larger changes. To analyze the line variations in real stars we computed the net contribution of a bipolar magnetic field over the stellar disk. The resulting disk-averaged magnetic field predicts variations with the rotation phase up to 2-3 % in the line EWs for a dipolar magnetic field of 1000 G.
publishDate 2014
dc.date.none.fl_str_mv 2014-03
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/11336/15044
Vallverdú, Rodolfo; Cidale, Lydia Sonia; Rohrmann, Rene Daniel; Ringuelet, Adela Emilia; Atmospheric models of He-peculiar stars: synthetic He I line profiles and absolute visual magnitudes; Springer; Astrophysics And Space Science; 352; 1; 3-2014; 95-102
0004-640X
url http://hdl.handle.net/11336/15044
identifier_str_mv Vallverdú, Rodolfo; Cidale, Lydia Sonia; Rohrmann, Rene Daniel; Ringuelet, Adela Emilia; Atmospheric models of He-peculiar stars: synthetic He I line profiles and absolute visual magnitudes; Springer; Astrophysics And Space Science; 352; 1; 3-2014; 95-102
0004-640X
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/https://link.springer.com/article/10.1007/s10509-014-1886-y
info:eu-repo/semantics/altIdentifier/doi/10.1007/s10509-014-1886-y
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
application/pdf
application/pdf
dc.publisher.none.fl_str_mv Springer
publisher.none.fl_str_mv Springer
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
_version_ 1846781950417698816
score 12.982451

Publicaciones similares