Heavy calcium in CP stars

Autores
Cowley, C. R.; Hubrig, S.; Castelli, F.; Gonzalez, Jorge Federico; Wolff, B.
Año de publicación
2007
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Large wavelength shifts of infrared triplet lines of Ca ii have been observed in the spectra of HgMn and magnetic Ap stars. They have been attributed to the heavy calcium isotopes, including 48Ca. One member of the triplet, λ8542, had been either unavailable, or of poor quality in earlier spectra. The present material shows conclusively that the stellar λ8542 shifts are consistent with an interpretation in terms of 48Ca. We find no relation between isotopic shifts of the Ca ii triplet lines, and those of Hg ii λ3984. There is a marginal indication that the shifts are anticorrelated with the surface field strengths of the magnetic stars. We see sparse evidence for 48Ca in other chemically peculiar stars, for example, Am stars, metal-poor stars or chemically peculiar red giants. However, the sample is still very small, and the wavelengths of all three triplet lines, including those in the Sun, show slight positive shifts with respect to terrestrial positions. Some profiles of the Ca ii infrared triplet in the magnetic stars show extensive wings beyond a well-defined core. We can obtain reasonable fits to these profiles using a stratified calcium abundance similar to that used by previous workers. There is no indication that either the stratification or the Zeeman effect significantly disturbs the measurement of isotope shifts.
Fil: Cowley, C. R.. University of Michigan; Estados Unidos
Fil: Hubrig, S.. European Southern Observatory Chile; Chile
Fil: Castelli, F.. Osservatorio Astronomico Di Trieste; Italia
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
Fil: Wolff, B.. European Southern Observatory Chile; Chile
Materia
STARS: ATMOSPHERES
STARS: CHEMICALLY PECULIAR
STARS: MAGNETIC FIELDS
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:11336/213979
Acceder
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network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Heavy calcium in CP starsCowley, C. R.Hubrig, S.Castelli, F.Gonzalez, Jorge FedericoWolff, B.STARS: ATMOSPHERESSTARS: CHEMICALLY PECULIARSTARS: MAGNETIC FIELDShttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1Large wavelength shifts of infrared triplet lines of Ca ii have been observed in the spectra of HgMn and magnetic Ap stars. They have been attributed to the heavy calcium isotopes, including 48Ca. One member of the triplet, λ8542, had been either unavailable, or of poor quality in earlier spectra. The present material shows conclusively that the stellar λ8542 shifts are consistent with an interpretation in terms of 48Ca. We find no relation between isotopic shifts of the Ca ii triplet lines, and those of Hg ii λ3984. There is a marginal indication that the shifts are anticorrelated with the surface field strengths of the magnetic stars. We see sparse evidence for 48Ca in other chemically peculiar stars, for example, Am stars, metal-poor stars or chemically peculiar red giants. However, the sample is still very small, and the wavelengths of all three triplet lines, including those in the Sun, show slight positive shifts with respect to terrestrial positions. Some profiles of the Ca ii infrared triplet in the magnetic stars show extensive wings beyond a well-defined core. We can obtain reasonable fits to these profiles using a stratified calcium abundance similar to that used by previous workers. There is no indication that either the stratification or the Zeeman effect significantly disturbs the measurement of isotope shifts.Fil: Cowley, C. R.. University of Michigan; Estados UnidosFil: Hubrig, S.. European Southern Observatory Chile; ChileFil: Castelli, F.. Osservatorio Astronomico Di Trieste; ItaliaFil: 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"; ArgentinaFil: Wolff, B.. European Southern Observatory Chile; ChileWiley Blackwell Publishing, Inc2007-12info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/213979Cowley, C. R.; Hubrig, S.; Castelli, F.; Gonzalez, Jorge Federico; Wolff, B.; Heavy calcium in CP stars; Wiley Blackwell Publishing, Inc; Monthly Notices of the Royal Astronomical Society; 377; 4; 12-2007; 1579-15870035-8711CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1111/j.1365-2966.2007.11719.xinfo:eu-repo/semantics/altIdentifier/url/https://academic.oup.com/mnras/article/377/4/1579/1088886info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-10-22T11:15:21Zoai:ri.conicet.gov.ar:11336/213979instacron: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 11:15:21.842CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Heavy calcium in CP stars
title Heavy calcium in CP stars
spellingShingle Heavy calcium in CP stars
Cowley, C. R.
STARS: ATMOSPHERES
STARS: CHEMICALLY PECULIAR
STARS: MAGNETIC FIELDS
title_short Heavy calcium in CP stars
title_full Heavy calcium in CP stars
title_fullStr Heavy calcium in CP stars
title_full_unstemmed Heavy calcium in CP stars
title_sort Heavy calcium in CP stars
dc.creator.none.fl_str_mv Cowley, C. R.
Hubrig, S.
Castelli, F.
Gonzalez, Jorge Federico
Wolff, B.
author Cowley, C. R.
author_facet Cowley, C. R.
Hubrig, S.
Castelli, F.
Gonzalez, Jorge Federico
Wolff, B.
author_role author
author2 Hubrig, S.
Castelli, F.
Gonzalez, Jorge Federico
Wolff, B.
author2_role author
author
author
author
dc.subject.none.fl_str_mv STARS: ATMOSPHERES
STARS: CHEMICALLY PECULIAR
STARS: MAGNETIC FIELDS
topic STARS: ATMOSPHERES
STARS: CHEMICALLY PECULIAR
STARS: MAGNETIC FIELDS
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Large wavelength shifts of infrared triplet lines of Ca ii have been observed in the spectra of HgMn and magnetic Ap stars. They have been attributed to the heavy calcium isotopes, including 48Ca. One member of the triplet, λ8542, had been either unavailable, or of poor quality in earlier spectra. The present material shows conclusively that the stellar λ8542 shifts are consistent with an interpretation in terms of 48Ca. We find no relation between isotopic shifts of the Ca ii triplet lines, and those of Hg ii λ3984. There is a marginal indication that the shifts are anticorrelated with the surface field strengths of the magnetic stars. We see sparse evidence for 48Ca in other chemically peculiar stars, for example, Am stars, metal-poor stars or chemically peculiar red giants. However, the sample is still very small, and the wavelengths of all three triplet lines, including those in the Sun, show slight positive shifts with respect to terrestrial positions. Some profiles of the Ca ii infrared triplet in the magnetic stars show extensive wings beyond a well-defined core. We can obtain reasonable fits to these profiles using a stratified calcium abundance similar to that used by previous workers. There is no indication that either the stratification or the Zeeman effect significantly disturbs the measurement of isotope shifts.
Fil: Cowley, C. R.. University of Michigan; Estados Unidos
Fil: Hubrig, S.. European Southern Observatory Chile; Chile
Fil: Castelli, F.. Osservatorio Astronomico Di Trieste; Italia
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
Fil: Wolff, B.. European Southern Observatory Chile; Chile
description Large wavelength shifts of infrared triplet lines of Ca ii have been observed in the spectra of HgMn and magnetic Ap stars. They have been attributed to the heavy calcium isotopes, including 48Ca. One member of the triplet, λ8542, had been either unavailable, or of poor quality in earlier spectra. The present material shows conclusively that the stellar λ8542 shifts are consistent with an interpretation in terms of 48Ca. We find no relation between isotopic shifts of the Ca ii triplet lines, and those of Hg ii λ3984. There is a marginal indication that the shifts are anticorrelated with the surface field strengths of the magnetic stars. We see sparse evidence for 48Ca in other chemically peculiar stars, for example, Am stars, metal-poor stars or chemically peculiar red giants. However, the sample is still very small, and the wavelengths of all three triplet lines, including those in the Sun, show slight positive shifts with respect to terrestrial positions. Some profiles of the Ca ii infrared triplet in the magnetic stars show extensive wings beyond a well-defined core. We can obtain reasonable fits to these profiles using a stratified calcium abundance similar to that used by previous workers. There is no indication that either the stratification or the Zeeman effect significantly disturbs the measurement of isotope shifts.
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/11336/213979
Cowley, C. R.; Hubrig, S.; Castelli, F.; Gonzalez, Jorge Federico; Wolff, B.; Heavy calcium in CP stars; Wiley Blackwell Publishing, Inc; Monthly Notices of the Royal Astronomical Society; 377; 4; 12-2007; 1579-1587
0035-8711
CONICET Digital
CONICET
url http://hdl.handle.net/11336/213979
identifier_str_mv Cowley, C. R.; Hubrig, S.; Castelli, F.; Gonzalez, Jorge Federico; Wolff, B.; Heavy calcium in CP stars; Wiley Blackwell Publishing, Inc; Monthly Notices of the Royal Astronomical Society; 377; 4; 12-2007; 1579-1587
0035-8711
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1111/j.1365-2966.2007.11719.x
info:eu-repo/semantics/altIdentifier/url/https://academic.oup.com/mnras/article/377/4/1579/1088886
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 Wiley Blackwell Publishing, Inc
publisher.none.fl_str_mv Wiley Blackwell Publishing, Inc
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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