Inhomogeneous surface distribution of chemical elements in the eclipsing binary AR Aur: A new challenge for our understanding of HgMn stars

Autores
Hubrig, S.; Gonzalez, Jorge Federico; Savanov, I.; Schöller, M.; Ageorges, N.; Cowley, C. R.; Wolff, B.
Año de publicación
2006
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
We present the results of a high spectral resolution study of the eclipsing binary AR Aur. AR Aur is the only known eclipsing binary with a HgMn primary star exactly on the zero-age main sequence (ZAMS) and a secondary star still contracting towards the ZAMS. We detect, for the first time in the spectra of the primary star, that for many elements the line profiles are variable over the rotation period. The strongest profile variations are found for the elements Pt, Hg, Sr, Y, Zr, He and Nd, while the line profiles of O, Na, Mg, Si, Ca, Ti and Fe show only weak distortions over the rotation period. The slight variability of He and Y is also confirmed by the study of high-resolution spectra of another HgMn star: α. And. A preliminary modelling of the inhomogeneous distribution has been carried out for Sr and Y Our analysis shows that these elements are very likely concentrated in a fractured ring along the rotational equator. It may be an essential clue for the explanation of the origin of the chemical anomalies in HgMn stars (which are very frequently found in binary and multiple systems) that one large fraction of the ring is missing exactly on the surface area which is permanently facing the secondary, and another small one on the almost opposite side. The results presented about the inhomogeneous distribution of various chemical elements over the stellar surface of the primary suggest new directions for investigations to solve the question of the origin of abundance anomalies in B-type stars with HgMn peculiarity.
Fil: Hubrig, S.. European Southern Observatory Chile; 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
Fil: Savanov, I.. Leibniz Institute For Astrophysics Potsdam; Alemania
Fil: Schöller, M.. European Southern Observatory Chile; Chile
Fil: Ageorges, N.. European Southern Observatory Chile; Chile
Fil: Cowley, C. R.. University of Michigan; Estados Unidos
Fil: Wolff, B.. European Southern Observatory Chile; Chile
Materia
BINARIES: ECLIPSING
BINARIES: SPECTROSCOPIC
STARS: ABUNDANCES
STARS: CHEMICALLY PECULIAR
STARS: INDIVIDUAL: AR AUR
STARS: INDIVIDUAL:Α AND
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:11336/214270
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/214270
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Inhomogeneous surface distribution of chemical elements in the eclipsing binary AR Aur: A new challenge for our understanding of HgMn starsHubrig, S.Gonzalez, Jorge FedericoSavanov, I.Schöller, M.Ageorges, N.Cowley, C. R.Wolff, B.BINARIES: ECLIPSINGBINARIES: SPECTROSCOPICSTARS: ABUNDANCESSTARS: CHEMICALLY PECULIARSTARS: INDIVIDUAL: AR AURSTARS: INDIVIDUAL:Α ANDhttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1We present the results of a high spectral resolution study of the eclipsing binary AR Aur. AR Aur is the only known eclipsing binary with a HgMn primary star exactly on the zero-age main sequence (ZAMS) and a secondary star still contracting towards the ZAMS. We detect, for the first time in the spectra of the primary star, that for many elements the line profiles are variable over the rotation period. The strongest profile variations are found for the elements Pt, Hg, Sr, Y, Zr, He and Nd, while the line profiles of O, Na, Mg, Si, Ca, Ti and Fe show only weak distortions over the rotation period. The slight variability of He and Y is also confirmed by the study of high-resolution spectra of another HgMn star: α. And. A preliminary modelling of the inhomogeneous distribution has been carried out for Sr and Y Our analysis shows that these elements are very likely concentrated in a fractured ring along the rotational equator. It may be an essential clue for the explanation of the origin of the chemical anomalies in HgMn stars (which are very frequently found in binary and multiple systems) that one large fraction of the ring is missing exactly on the surface area which is permanently facing the secondary, and another small one on the almost opposite side. The results presented about the inhomogeneous distribution of various chemical elements over the stellar surface of the primary suggest new directions for investigations to solve the question of the origin of abundance anomalies in B-type stars with HgMn peculiarity.Fil: Hubrig, S.. European Southern Observatory Chile; 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"; ArgentinaFil: Savanov, I.. Leibniz Institute For Astrophysics Potsdam; AlemaniaFil: Schöller, M.. European Southern Observatory Chile; ChileFil: Ageorges, N.. European Southern Observatory Chile; ChileFil: Cowley, C. R.. University of Michigan; Estados UnidosFil: Wolff, B.. European Southern Observatory Chile; ChileWiley Blackwell Publishing, Inc2006-12info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/214270Hubrig, S.; Gonzalez, Jorge Federico; Savanov, I.; Schöller, M.; Ageorges, N.; et al.; Inhomogeneous surface distribution of chemical elements in the eclipsing binary AR Aur: A new challenge for our understanding of HgMn stars; Wiley Blackwell Publishing, Inc; Monthly Notices of the Royal Astronomical Society; 371; 4; 12-2006; 1953-19580035-8711CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://academic.oup.com/mnras/article/371/4/1953/1061072info:eu-repo/semantics/altIdentifier/doi/10.1111/j.1365-2966.2006.10863.xinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:30:12Zoai:ri.conicet.gov.ar:11336/214270instacron: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 10:30:12.681CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Inhomogeneous surface distribution of chemical elements in the eclipsing binary AR Aur: A new challenge for our understanding of HgMn stars
title Inhomogeneous surface distribution of chemical elements in the eclipsing binary AR Aur: A new challenge for our understanding of HgMn stars
spellingShingle Inhomogeneous surface distribution of chemical elements in the eclipsing binary AR Aur: A new challenge for our understanding of HgMn stars
Hubrig, S.
BINARIES: ECLIPSING
BINARIES: SPECTROSCOPIC
STARS: ABUNDANCES
STARS: CHEMICALLY PECULIAR
STARS: INDIVIDUAL: AR AUR
STARS: INDIVIDUAL:Α AND
title_short Inhomogeneous surface distribution of chemical elements in the eclipsing binary AR Aur: A new challenge for our understanding of HgMn stars
title_full Inhomogeneous surface distribution of chemical elements in the eclipsing binary AR Aur: A new challenge for our understanding of HgMn stars
title_fullStr Inhomogeneous surface distribution of chemical elements in the eclipsing binary AR Aur: A new challenge for our understanding of HgMn stars
title_full_unstemmed Inhomogeneous surface distribution of chemical elements in the eclipsing binary AR Aur: A new challenge for our understanding of HgMn stars
title_sort Inhomogeneous surface distribution of chemical elements in the eclipsing binary AR Aur: A new challenge for our understanding of HgMn stars
dc.creator.none.fl_str_mv Hubrig, S.
Gonzalez, Jorge Federico
Savanov, I.
Schöller, M.
Ageorges, N.
Cowley, C. R.
Wolff, B.
author Hubrig, S.
author_facet Hubrig, S.
Gonzalez, Jorge Federico
Savanov, I.
Schöller, M.
Ageorges, N.
Cowley, C. R.
Wolff, B.
author_role author
author2 Gonzalez, Jorge Federico
Savanov, I.
Schöller, M.
Ageorges, N.
Cowley, C. R.
Wolff, B.
author2_role author
author
author
author
author
author
dc.subject.none.fl_str_mv BINARIES: ECLIPSING
BINARIES: SPECTROSCOPIC
STARS: ABUNDANCES
STARS: CHEMICALLY PECULIAR
STARS: INDIVIDUAL: AR AUR
STARS: INDIVIDUAL:Α AND
topic BINARIES: ECLIPSING
BINARIES: SPECTROSCOPIC
STARS: ABUNDANCES
STARS: CHEMICALLY PECULIAR
STARS: INDIVIDUAL: AR AUR
STARS: INDIVIDUAL:Α AND
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 present the results of a high spectral resolution study of the eclipsing binary AR Aur. AR Aur is the only known eclipsing binary with a HgMn primary star exactly on the zero-age main sequence (ZAMS) and a secondary star still contracting towards the ZAMS. We detect, for the first time in the spectra of the primary star, that for many elements the line profiles are variable over the rotation period. The strongest profile variations are found for the elements Pt, Hg, Sr, Y, Zr, He and Nd, while the line profiles of O, Na, Mg, Si, Ca, Ti and Fe show only weak distortions over the rotation period. The slight variability of He and Y is also confirmed by the study of high-resolution spectra of another HgMn star: α. And. A preliminary modelling of the inhomogeneous distribution has been carried out for Sr and Y Our analysis shows that these elements are very likely concentrated in a fractured ring along the rotational equator. It may be an essential clue for the explanation of the origin of the chemical anomalies in HgMn stars (which are very frequently found in binary and multiple systems) that one large fraction of the ring is missing exactly on the surface area which is permanently facing the secondary, and another small one on the almost opposite side. The results presented about the inhomogeneous distribution of various chemical elements over the stellar surface of the primary suggest new directions for investigations to solve the question of the origin of abundance anomalies in B-type stars with HgMn peculiarity.
Fil: Hubrig, S.. European Southern Observatory Chile; 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
Fil: Savanov, I.. Leibniz Institute For Astrophysics Potsdam; Alemania
Fil: Schöller, M.. European Southern Observatory Chile; Chile
Fil: Ageorges, N.. European Southern Observatory Chile; Chile
Fil: Cowley, C. R.. University of Michigan; Estados Unidos
Fil: Wolff, B.. European Southern Observatory Chile; Chile
description We present the results of a high spectral resolution study of the eclipsing binary AR Aur. AR Aur is the only known eclipsing binary with a HgMn primary star exactly on the zero-age main sequence (ZAMS) and a secondary star still contracting towards the ZAMS. We detect, for the first time in the spectra of the primary star, that for many elements the line profiles are variable over the rotation period. The strongest profile variations are found for the elements Pt, Hg, Sr, Y, Zr, He and Nd, while the line profiles of O, Na, Mg, Si, Ca, Ti and Fe show only weak distortions over the rotation period. The slight variability of He and Y is also confirmed by the study of high-resolution spectra of another HgMn star: α. And. A preliminary modelling of the inhomogeneous distribution has been carried out for Sr and Y Our analysis shows that these elements are very likely concentrated in a fractured ring along the rotational equator. It may be an essential clue for the explanation of the origin of the chemical anomalies in HgMn stars (which are very frequently found in binary and multiple systems) that one large fraction of the ring is missing exactly on the surface area which is permanently facing the secondary, and another small one on the almost opposite side. The results presented about the inhomogeneous distribution of various chemical elements over the stellar surface of the primary suggest new directions for investigations to solve the question of the origin of abundance anomalies in B-type stars with HgMn peculiarity.
publishDate 2006
dc.date.none.fl_str_mv 2006-12
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/11336/214270
Hubrig, S.; Gonzalez, Jorge Federico; Savanov, I.; Schöller, M.; Ageorges, N.; et al.; Inhomogeneous surface distribution of chemical elements in the eclipsing binary AR Aur: A new challenge for our understanding of HgMn stars; Wiley Blackwell Publishing, Inc; Monthly Notices of the Royal Astronomical Society; 371; 4; 12-2006; 1953-1958
0035-8711
CONICET Digital
CONICET
url http://hdl.handle.net/11336/214270
identifier_str_mv Hubrig, S.; Gonzalez, Jorge Federico; Savanov, I.; Schöller, M.; Ageorges, N.; et al.; Inhomogeneous surface distribution of chemical elements in the eclipsing binary AR Aur: A new challenge for our understanding of HgMn stars; Wiley Blackwell Publishing, Inc; Monthly Notices of the Royal Astronomical Society; 371; 4; 12-2006; 1953-1958
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/url/https://academic.oup.com/mnras/article/371/4/1953/1061072
info:eu-repo/semantics/altIdentifier/doi/10.1111/j.1365-2966.2006.10863.x
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 13.070432

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