Detection of variable Si II, Mn II, and Fe II emission lines in the magnetic Bp star a Centauri

Autores
Hubrig, S.; Gonzalez, Jorge Federico
Año de publicación
2007
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Context. The nature of non-variable high-excitation emission lines detected in the optical spectra of normal late-B type and chemically peculiar HgMn and PGa stars is still poorly understood. Aims. To better understand the origin of the weak emission lines in B type stars it is especially important to investigate the spectra of a variety of stars to search for correlations between the emergence of these lines and fundamental stellar parameters. Methods. We have acquired high resolution UVES spectra for the sharp-lined magnetic helium-variable star a Cen over the rotation period of 8.82 d to search for the presence of weak emission lines. Results. For the first time we present observational evidence for the appearance of variable high-excitation Si II, Mn II and Fe II emission lines in a magnetic Bp star. Si II emissions are the strongest at the phase corresponding to the maximum strength of He I lines. Mn II and Fe II emissions vary in antiphase to the He I lines. A correlation is found between the probable location of Mn and Fe surface spots and the strength of the emission lines. On the basis of the currently available data it seems possible that the same kind of selective excitation process is working in the atmospheres of objects within a broad parameter space which could be defined by age, effective temperature, chemical composition, rotational velocity, and magnetic field. Neutral iron lines previously reported to appear broad and shallow at certain phases are not detected in our spectra, although two of them are identified as He I forbidden lines, snowing maximum strength at the phase of the passage of the He rich region across the visible disk.
Fil: Hubrig, S.. European Southern Observatory Santiago; Chile
Fil: Gonzalez, Jorge Federico. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Juan. Complejo Astronómico "El Leoncito". Universidad Nacional de Córdoba. Complejo Astronómico "El Leoncito". Universidad Nacional de la Plata. Complejo Astronómico "El Leoncito". Universidad Nacional de San Juan. Complejo Astronómico "El Leoncito"; Argentina
Materia
LINE: IDENTIFICATION
STARS: ABUNDANCES
STARS: CHEMICALLY PECULIAR
STARS: EMISSION-LINE, BE
STARS: INDIVIDUAL: HD 125823
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:11336/213844
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/213844
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Detection of variable Si II, Mn II, and Fe II emission lines in the magnetic Bp star a CentauriHubrig, S.Gonzalez, Jorge FedericoLINE: IDENTIFICATIONSTARS: ABUNDANCESSTARS: CHEMICALLY PECULIARSTARS: EMISSION-LINE, BESTARS: INDIVIDUAL: HD 125823https://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1Context. The nature of non-variable high-excitation emission lines detected in the optical spectra of normal late-B type and chemically peculiar HgMn and PGa stars is still poorly understood. Aims. To better understand the origin of the weak emission lines in B type stars it is especially important to investigate the spectra of a variety of stars to search for correlations between the emergence of these lines and fundamental stellar parameters. Methods. We have acquired high resolution UVES spectra for the sharp-lined magnetic helium-variable star a Cen over the rotation period of 8.82 d to search for the presence of weak emission lines. Results. For the first time we present observational evidence for the appearance of variable high-excitation Si II, Mn II and Fe II emission lines in a magnetic Bp star. Si II emissions are the strongest at the phase corresponding to the maximum strength of He I lines. Mn II and Fe II emissions vary in antiphase to the He I lines. A correlation is found between the probable location of Mn and Fe surface spots and the strength of the emission lines. On the basis of the currently available data it seems possible that the same kind of selective excitation process is working in the atmospheres of objects within a broad parameter space which could be defined by age, effective temperature, chemical composition, rotational velocity, and magnetic field. Neutral iron lines previously reported to appear broad and shallow at certain phases are not detected in our spectra, although two of them are identified as He I forbidden lines, snowing maximum strength at the phase of the passage of the He rich region across the visible disk.Fil: Hubrig, S.. European Southern Observatory Santiago; ChileFil: Gonzalez, Jorge Federico. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Juan. Complejo Astronómico "El Leoncito". Universidad Nacional de Córdoba. Complejo Astronómico "El Leoncito". Universidad Nacional de la Plata. Complejo Astronómico "El Leoncito". Universidad Nacional de San Juan. Complejo Astronómico "El Leoncito"; ArgentinaEDP Sciences2007-12info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/213844Hubrig, S.; Gonzalez, Jorge Federico; Detection of variable Si II, Mn II, and Fe II emission lines in the magnetic Bp star a Centauri; EDP Sciences; Astronomy and Astrophysics; 466; 3; 12-2007; 1083-10870004-6361CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361:20066738info:eu-repo/semantics/altIdentifier/url/https://www.aanda.org/articles/aa/abs/2007/18/aa6738-06/aa6738-06.htmlinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T09:42:54Zoai:ri.conicet.gov.ar:11336/213844instacron: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 09:42:54.643CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Detection of variable Si II, Mn II, and Fe II emission lines in the magnetic Bp star a Centauri
title Detection of variable Si II, Mn II, and Fe II emission lines in the magnetic Bp star a Centauri
spellingShingle Detection of variable Si II, Mn II, and Fe II emission lines in the magnetic Bp star a Centauri
Hubrig, S.
LINE: IDENTIFICATION
STARS: ABUNDANCES
STARS: CHEMICALLY PECULIAR
STARS: EMISSION-LINE, BE
STARS: INDIVIDUAL: HD 125823
title_short Detection of variable Si II, Mn II, and Fe II emission lines in the magnetic Bp star a Centauri
title_full Detection of variable Si II, Mn II, and Fe II emission lines in the magnetic Bp star a Centauri
title_fullStr Detection of variable Si II, Mn II, and Fe II emission lines in the magnetic Bp star a Centauri
title_full_unstemmed Detection of variable Si II, Mn II, and Fe II emission lines in the magnetic Bp star a Centauri
title_sort Detection of variable Si II, Mn II, and Fe II emission lines in the magnetic Bp star a Centauri
dc.creator.none.fl_str_mv Hubrig, S.
Gonzalez, Jorge Federico
author Hubrig, S.
author_facet Hubrig, S.
Gonzalez, Jorge Federico
author_role author
author2 Gonzalez, Jorge Federico
author2_role author
dc.subject.none.fl_str_mv LINE: IDENTIFICATION
STARS: ABUNDANCES
STARS: CHEMICALLY PECULIAR
STARS: EMISSION-LINE, BE
STARS: INDIVIDUAL: HD 125823
topic LINE: IDENTIFICATION
STARS: ABUNDANCES
STARS: CHEMICALLY PECULIAR
STARS: EMISSION-LINE, BE
STARS: INDIVIDUAL: HD 125823
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. The nature of non-variable high-excitation emission lines detected in the optical spectra of normal late-B type and chemically peculiar HgMn and PGa stars is still poorly understood. Aims. To better understand the origin of the weak emission lines in B type stars it is especially important to investigate the spectra of a variety of stars to search for correlations between the emergence of these lines and fundamental stellar parameters. Methods. We have acquired high resolution UVES spectra for the sharp-lined magnetic helium-variable star a Cen over the rotation period of 8.82 d to search for the presence of weak emission lines. Results. For the first time we present observational evidence for the appearance of variable high-excitation Si II, Mn II and Fe II emission lines in a magnetic Bp star. Si II emissions are the strongest at the phase corresponding to the maximum strength of He I lines. Mn II and Fe II emissions vary in antiphase to the He I lines. A correlation is found between the probable location of Mn and Fe surface spots and the strength of the emission lines. On the basis of the currently available data it seems possible that the same kind of selective excitation process is working in the atmospheres of objects within a broad parameter space which could be defined by age, effective temperature, chemical composition, rotational velocity, and magnetic field. Neutral iron lines previously reported to appear broad and shallow at certain phases are not detected in our spectra, although two of them are identified as He I forbidden lines, snowing maximum strength at the phase of the passage of the He rich region across the visible disk.
Fil: Hubrig, S.. European Southern Observatory Santiago; Chile
Fil: Gonzalez, Jorge Federico. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Juan. Complejo Astronómico "El Leoncito". Universidad Nacional de Córdoba. Complejo Astronómico "El Leoncito". Universidad Nacional de la Plata. Complejo Astronómico "El Leoncito". Universidad Nacional de San Juan. Complejo Astronómico "El Leoncito"; Argentina
description Context. The nature of non-variable high-excitation emission lines detected in the optical spectra of normal late-B type and chemically peculiar HgMn and PGa stars is still poorly understood. Aims. To better understand the origin of the weak emission lines in B type stars it is especially important to investigate the spectra of a variety of stars to search for correlations between the emergence of these lines and fundamental stellar parameters. Methods. We have acquired high resolution UVES spectra for the sharp-lined magnetic helium-variable star a Cen over the rotation period of 8.82 d to search for the presence of weak emission lines. Results. For the first time we present observational evidence for the appearance of variable high-excitation Si II, Mn II and Fe II emission lines in a magnetic Bp star. Si II emissions are the strongest at the phase corresponding to the maximum strength of He I lines. Mn II and Fe II emissions vary in antiphase to the He I lines. A correlation is found between the probable location of Mn and Fe surface spots and the strength of the emission lines. On the basis of the currently available data it seems possible that the same kind of selective excitation process is working in the atmospheres of objects within a broad parameter space which could be defined by age, effective temperature, chemical composition, rotational velocity, and magnetic field. Neutral iron lines previously reported to appear broad and shallow at certain phases are not detected in our spectra, although two of them are identified as He I forbidden lines, snowing maximum strength at the phase of the passage of the He rich region across the visible disk.
publishDate 2007
dc.date.none.fl_str_mv 2007-12
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/11336/213844
Hubrig, S.; Gonzalez, Jorge Federico; Detection of variable Si II, Mn II, and Fe II emission lines in the magnetic Bp star a Centauri; EDP Sciences; Astronomy and Astrophysics; 466; 3; 12-2007; 1083-1087
0004-6361
CONICET Digital
CONICET
url http://hdl.handle.net/11336/213844
identifier_str_mv Hubrig, S.; Gonzalez, Jorge Federico; Detection of variable Si II, Mn II, and Fe II emission lines in the magnetic Bp star a Centauri; EDP Sciences; Astronomy and Astrophysics; 466; 3; 12-2007; 1083-1087
0004-6361
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361:20066738
info:eu-repo/semantics/altIdentifier/url/https://www.aanda.org/articles/aa/abs/2007/18/aa6738-06/aa6738-06.html
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 13.070432

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