Lanthanides and other spectral oddities in a Centauri: Ce III, Nd III, KrII, and broad absorption features

Autores
Cowley, C. R.; Hubrig, S.; Gonzalez, Jorge Federico
Año de publicación
2010
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Context. There is considerable interest in the helium variable a Cen as a bridge between helium-weak and helium-strong CP stars. Aims. We investigate Ce iii and other possible lanthanides in the spectrum the of hottest chemically peculiar (CP) star in which these elements have been found. A Kr ii line appears within a broad absorption which we suggest may be due to a high-level transition in C ii. Methods. Wavelengths and equivalent widths are measured on high-resolution UVES spectra, analyzed, and their phase-variations investigated. Results. New, robust identifications of Ce iii and Kr ii are demonstrated. Nd iii is likely present. A broad absorption near λ4619 is present at all phases of a Cen, and in some other early B stars. Conclusions. The presence of lanthanides in a Cen strengthens the view that this star is a significant link between the cooler CP stars and the hotter helium-peculiar stars. Broad absorptions in a Cen are not well explained.
Fil: Cowley, C. R.. University Of Michigan; Estados Unidos
Fil: Hubrig, S.. AIP; Alemania
Fil: Gonzalez, Jorge Federico. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnologico San Juan. Instituto de Ciencias Astronomicas de la Tierra y del Espacio; Argentina
Materia
stars:chemically peculiar
stars: variable
stars: individual: a Cen
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:11336/12977
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/12977
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repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Lanthanides and other spectral oddities in a Centauri: Ce III, Nd III, KrII, and broad absorption featuresCowley, C. R.Hubrig, S.Gonzalez, Jorge Federicostars:chemically peculiarstars: variablestars: individual: a Cenhttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1Context. There is considerable interest in the helium variable a Cen as a bridge between helium-weak and helium-strong CP stars. Aims. We investigate Ce iii and other possible lanthanides in the spectrum the of hottest chemically peculiar (CP) star in which these elements have been found. A Kr ii line appears within a broad absorption which we suggest may be due to a high-level transition in C ii. Methods. Wavelengths and equivalent widths are measured on high-resolution UVES spectra, analyzed, and their phase-variations investigated. Results. New, robust identifications of Ce iii and Kr ii are demonstrated. Nd iii is likely present. A broad absorption near λ4619 is present at all phases of a Cen, and in some other early B stars. Conclusions. The presence of lanthanides in a Cen strengthens the view that this star is a significant link between the cooler CP stars and the hotter helium-peculiar stars. Broad absorptions in a Cen are not well explained.Fil: Cowley, C. R.. University Of Michigan; Estados UnidosFil: Hubrig, S.. AIP; AlemaniaFil: Gonzalez, Jorge Federico. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnologico San Juan. Instituto de Ciencias Astronomicas de la Tierra y del Espacio; ArgentinaEdp Sciences2010-11info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/12977Cowley, C. R.; Hubrig, S.; Gonzalez, Jorge Federico; Lanthanides and other spectral oddities in a Centauri: Ce III, Nd III, KrII, and broad absorption features; Edp Sciences; Astronomy And Astrophysics; 523; 11-2010; 82-860004-6361enginfo:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361/201015492info:eu-repo/semantics/altIdentifier/url/http://www.aanda.org/articles/aa/abs/2010/15/aa15492-10/aa15492-10.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 Técnicas2025-10-22T11:39:18Zoai:ri.conicet.gov.ar:11336/12977instacron: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 11:39:18.407CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Lanthanides and other spectral oddities in a Centauri: Ce III, Nd III, KrII, and broad absorption features
title Lanthanides and other spectral oddities in a Centauri: Ce III, Nd III, KrII, and broad absorption features
spellingShingle Lanthanides and other spectral oddities in a Centauri: Ce III, Nd III, KrII, and broad absorption features
Cowley, C. R.
stars:chemically peculiar
stars: variable
stars: individual: a Cen
title_short Lanthanides and other spectral oddities in a Centauri: Ce III, Nd III, KrII, and broad absorption features
title_full Lanthanides and other spectral oddities in a Centauri: Ce III, Nd III, KrII, and broad absorption features
title_fullStr Lanthanides and other spectral oddities in a Centauri: Ce III, Nd III, KrII, and broad absorption features
title_full_unstemmed Lanthanides and other spectral oddities in a Centauri: Ce III, Nd III, KrII, and broad absorption features
title_sort Lanthanides and other spectral oddities in a Centauri: Ce III, Nd III, KrII, and broad absorption features
dc.creator.none.fl_str_mv Cowley, C. R.
Hubrig, S.
Gonzalez, Jorge Federico
author Cowley, C. R.
author_facet Cowley, C. R.
Hubrig, S.
Gonzalez, Jorge Federico
author_role author
author2 Hubrig, S.
Gonzalez, Jorge Federico
author2_role author
author
dc.subject.none.fl_str_mv stars:chemically peculiar
stars: variable
stars: individual: a Cen
topic stars:chemically peculiar
stars: variable
stars: individual: a Cen
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. There is considerable interest in the helium variable a Cen as a bridge between helium-weak and helium-strong CP stars. Aims. We investigate Ce iii and other possible lanthanides in the spectrum the of hottest chemically peculiar (CP) star in which these elements have been found. A Kr ii line appears within a broad absorption which we suggest may be due to a high-level transition in C ii. Methods. Wavelengths and equivalent widths are measured on high-resolution UVES spectra, analyzed, and their phase-variations investigated. Results. New, robust identifications of Ce iii and Kr ii are demonstrated. Nd iii is likely present. A broad absorption near λ4619 is present at all phases of a Cen, and in some other early B stars. Conclusions. The presence of lanthanides in a Cen strengthens the view that this star is a significant link between the cooler CP stars and the hotter helium-peculiar stars. Broad absorptions in a Cen are not well explained.
Fil: Cowley, C. R.. University Of Michigan; Estados Unidos
Fil: Hubrig, S.. AIP; Alemania
Fil: Gonzalez, Jorge Federico. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnologico San Juan. Instituto de Ciencias Astronomicas de la Tierra y del Espacio; Argentina
description Context. There is considerable interest in the helium variable a Cen as a bridge between helium-weak and helium-strong CP stars. Aims. We investigate Ce iii and other possible lanthanides in the spectrum the of hottest chemically peculiar (CP) star in which these elements have been found. A Kr ii line appears within a broad absorption which we suggest may be due to a high-level transition in C ii. Methods. Wavelengths and equivalent widths are measured on high-resolution UVES spectra, analyzed, and their phase-variations investigated. Results. New, robust identifications of Ce iii and Kr ii are demonstrated. Nd iii is likely present. A broad absorption near λ4619 is present at all phases of a Cen, and in some other early B stars. Conclusions. The presence of lanthanides in a Cen strengthens the view that this star is a significant link between the cooler CP stars and the hotter helium-peculiar stars. Broad absorptions in a Cen are not well explained.
publishDate 2010
dc.date.none.fl_str_mv 2010-11
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/11336/12977
Cowley, C. R.; Hubrig, S.; Gonzalez, Jorge Federico; Lanthanides and other spectral oddities in a Centauri: Ce III, Nd III, KrII, and broad absorption features; Edp Sciences; Astronomy And Astrophysics; 523; 11-2010; 82-86
0004-6361
url http://hdl.handle.net/11336/12977
identifier_str_mv Cowley, C. R.; Hubrig, S.; Gonzalez, Jorge Federico; Lanthanides and other spectral oddities in a Centauri: Ce III, Nd III, KrII, and broad absorption features; Edp Sciences; Astronomy And Astrophysics; 523; 11-2010; 82-86
0004-6361
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361/201015492
info:eu-repo/semantics/altIdentifier/url/http://www.aanda.org/articles/aa/abs/2010/15/aa15492-10/aa15492-10.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 12.982451

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