HD 65949: Rosetta stone or red herring

Autores
Cowley, C. R.; Hubrig, S.; Palmeri, P.; Quinet, P.; Biémont, É.; Wahlgren, G. M.; Schütz, O.; Gonzalez, Jorge Federico
Año de publicación
2010
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
HD 65949 is a late B star with exceptionally strong Hg ii λ3984, but it is not a typical HgMn star. The Re ii spectrum is of extraordinary strength. Abundances or upper limits are derived here for 58 elements based on a model with Teff= 13 100 K and log (g) = 4.0. Even-Z elements through nickel show minor deviations from solar abundances. Anomalies among the odd-Z elements through copper are mostly small. Beyond the iron peak, a huge scatter is found. Enormous enhancements are found for the elements rhenium through mercury (Z= 75–80). We note the presence of Th iii in the spectrum. The abundance pattern of the heaviest elements resembles the N= 126 r-process peak of solar material, though not in detail. An odd-Z anomaly appears at the triplet (Zr Nb Mo), and there is a large abundance jump between Xe (Z= 54) and Ba (Z= 56). These are signatures of chemical fractionation. We find a significant correlation of the abundance excesses with second ionization potentials for elements with Z > 30. If this is not a red herring (false lead), it indicates the relevance of photospheric or near-photospheric processes. Large excesses (4–6 dex) require diffusion from deeper layers with the elements passing through a number of ionization stages. That would make the correlation with second ionization potential puzzling. We explore a model with mass accretion of exotic material followed by the more commonly accepted differentiation by diffusion. That model leads to a number of predictions which challenge future work. New observations confirm the orbital elements of Gieseking and Karimie, apart from the systemic velocity, which has increased. Likely primary and secondary masses are near 3.3 and 1.6 M⊙, with a separation of ca. 0.25 au. New atomic structure calculations are presented in two appendices. These include partition functions for the first through third spectra of Ru, Re and Os, as well as oscillator strengths in the Re ii spectrum
Fil: Cowley, C. R.. University Of Michigan; Estados Unidos
Fil: Hubrig, S.. Astrophysikalisches Institut Potsdam; Alemania
Fil: Palmeri, P.. Universite de Mons; Bélgica
Fil: Quinet, P.. Universite de Mons; Bélgica. Universite de Liege; Bélgica
Fil: Biémont, É.. Universite de Mons; Bélgica. Universite de Liege; Bélgica
Fil: Wahlgren, G. M. . Catholic University of America; Estados Unidos. National Aeronautics And Space Administration. Goddart Institute For Space Studies; Estados Unidos
Fil: Schütz, O. . European Southern Observatory; Chile
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
ASTROCHEMISTRY
DIFFUSION
STARS:ABUNDANCES
STARS:CHEMICALLY PECULIARS
STARS: INDIVIDUAL: HD65949
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:11336/12982

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repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling HD 65949: Rosetta stone or red herringCowley, C. R.Hubrig, S.Palmeri, P.Quinet, P.Biémont, É.Wahlgren, G. M. Schütz, O. Gonzalez, Jorge FedericoASTROCHEMISTRYDIFFUSIONSTARS:ABUNDANCESSTARS:CHEMICALLY PECULIARSSTARS: INDIVIDUAL: HD65949https://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1HD 65949 is a late B star with exceptionally strong Hg ii λ3984, but it is not a typical HgMn star. The Re ii spectrum is of extraordinary strength. Abundances or upper limits are derived here for 58 elements based on a model with Teff= 13 100 K and log (g) = 4.0. Even-Z elements through nickel show minor deviations from solar abundances. Anomalies among the odd-Z elements through copper are mostly small. Beyond the iron peak, a huge scatter is found. Enormous enhancements are found for the elements rhenium through mercury (Z= 75–80). We note the presence of Th iii in the spectrum. The abundance pattern of the heaviest elements resembles the N= 126 r-process peak of solar material, though not in detail. An odd-Z anomaly appears at the triplet (Zr Nb Mo), and there is a large abundance jump between Xe (Z= 54) and Ba (Z= 56). These are signatures of chemical fractionation. We find a significant correlation of the abundance excesses with second ionization potentials for elements with Z > 30. If this is not a red herring (false lead), it indicates the relevance of photospheric or near-photospheric processes. Large excesses (4–6 dex) require diffusion from deeper layers with the elements passing through a number of ionization stages. That would make the correlation with second ionization potential puzzling. We explore a model with mass accretion of exotic material followed by the more commonly accepted differentiation by diffusion. That model leads to a number of predictions which challenge future work. New observations confirm the orbital elements of Gieseking and Karimie, apart from the systemic velocity, which has increased. Likely primary and secondary masses are near 3.3 and 1.6 M⊙, with a separation of ca. 0.25 au. New atomic structure calculations are presented in two appendices. These include partition functions for the first through third spectra of Ru, Re and Os, as well as oscillator strengths in the Re ii spectrumFil: Cowley, C. R.. University Of Michigan; Estados UnidosFil: Hubrig, S.. Astrophysikalisches Institut Potsdam; AlemaniaFil: Palmeri, P.. Universite de Mons; BélgicaFil: Quinet, P.. Universite de Mons; Bélgica. Universite de Liege; BélgicaFil: Biémont, É.. Universite de Mons; Bélgica. Universite de Liege; BélgicaFil: Wahlgren, G. M. . Catholic University of America; Estados Unidos. National Aeronautics And Space Administration. Goddart Institute For Space Studies; Estados UnidosFil: Schütz, O. . European Southern Observatory; ChileFil: 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; ArgentinaOxford University Press2010-06info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/12982Cowley, C. R.; Hubrig, S.; Palmeri, P.; Quinet, P.; Biémont, É.; et al.; HD 65949: Rosetta stone or red herring; Oxford University Press; Monthly Notices Of The Royal Astronomical Society; 405; 2; 6-2010; 1271-12840035-8711enginfo:eu-repo/semantics/altIdentifier/url/https://academic.oup.com/mnras/article/405/2/1271/1185259/HD-65949-Rosetta-stone-or-red-herringinfo:eu-repo/semantics/altIdentifier/doi/10.1111/j.1365-2966.2010.16529.xinfo:eu-repo/semantics/altIdentifier/url/https://arxiv.org/abs/1002.2945info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T09:46:27Zoai:ri.conicet.gov.ar:11336/12982instacron: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 09:46:27.428CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv HD 65949: Rosetta stone or red herring
title HD 65949: Rosetta stone or red herring
spellingShingle HD 65949: Rosetta stone or red herring
Cowley, C. R.
ASTROCHEMISTRY
DIFFUSION
STARS:ABUNDANCES
STARS:CHEMICALLY PECULIARS
STARS: INDIVIDUAL: HD65949
title_short HD 65949: Rosetta stone or red herring
title_full HD 65949: Rosetta stone or red herring
title_fullStr HD 65949: Rosetta stone or red herring
title_full_unstemmed HD 65949: Rosetta stone or red herring
title_sort HD 65949: Rosetta stone or red herring
dc.creator.none.fl_str_mv Cowley, C. R.
Hubrig, S.
Palmeri, P.
Quinet, P.
Biémont, É.
Wahlgren, G. M.
Schütz, O.
Gonzalez, Jorge Federico
author Cowley, C. R.
author_facet Cowley, C. R.
Hubrig, S.
Palmeri, P.
Quinet, P.
Biémont, É.
Wahlgren, G. M.
Schütz, O.
Gonzalez, Jorge Federico
author_role author
author2 Hubrig, S.
Palmeri, P.
Quinet, P.
Biémont, É.
Wahlgren, G. M.
Schütz, O.
Gonzalez, Jorge Federico
author2_role author
author
author
author
author
author
author
dc.subject.none.fl_str_mv ASTROCHEMISTRY
DIFFUSION
STARS:ABUNDANCES
STARS:CHEMICALLY PECULIARS
STARS: INDIVIDUAL: HD65949
topic ASTROCHEMISTRY
DIFFUSION
STARS:ABUNDANCES
STARS:CHEMICALLY PECULIARS
STARS: INDIVIDUAL: HD65949
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv HD 65949 is a late B star with exceptionally strong Hg ii λ3984, but it is not a typical HgMn star. The Re ii spectrum is of extraordinary strength. Abundances or upper limits are derived here for 58 elements based on a model with Teff= 13 100 K and log (g) = 4.0. Even-Z elements through nickel show minor deviations from solar abundances. Anomalies among the odd-Z elements through copper are mostly small. Beyond the iron peak, a huge scatter is found. Enormous enhancements are found for the elements rhenium through mercury (Z= 75–80). We note the presence of Th iii in the spectrum. The abundance pattern of the heaviest elements resembles the N= 126 r-process peak of solar material, though not in detail. An odd-Z anomaly appears at the triplet (Zr Nb Mo), and there is a large abundance jump between Xe (Z= 54) and Ba (Z= 56). These are signatures of chemical fractionation. We find a significant correlation of the abundance excesses with second ionization potentials for elements with Z > 30. If this is not a red herring (false lead), it indicates the relevance of photospheric or near-photospheric processes. Large excesses (4–6 dex) require diffusion from deeper layers with the elements passing through a number of ionization stages. That would make the correlation with second ionization potential puzzling. We explore a model with mass accretion of exotic material followed by the more commonly accepted differentiation by diffusion. That model leads to a number of predictions which challenge future work. New observations confirm the orbital elements of Gieseking and Karimie, apart from the systemic velocity, which has increased. Likely primary and secondary masses are near 3.3 and 1.6 M⊙, with a separation of ca. 0.25 au. New atomic structure calculations are presented in two appendices. These include partition functions for the first through third spectra of Ru, Re and Os, as well as oscillator strengths in the Re ii spectrum
Fil: Cowley, C. R.. University Of Michigan; Estados Unidos
Fil: Hubrig, S.. Astrophysikalisches Institut Potsdam; Alemania
Fil: Palmeri, P.. Universite de Mons; Bélgica
Fil: Quinet, P.. Universite de Mons; Bélgica. Universite de Liege; Bélgica
Fil: Biémont, É.. Universite de Mons; Bélgica. Universite de Liege; Bélgica
Fil: Wahlgren, G. M. . Catholic University of America; Estados Unidos. National Aeronautics And Space Administration. Goddart Institute For Space Studies; Estados Unidos
Fil: Schütz, O. . European Southern Observatory; Chile
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 HD 65949 is a late B star with exceptionally strong Hg ii λ3984, but it is not a typical HgMn star. The Re ii spectrum is of extraordinary strength. Abundances or upper limits are derived here for 58 elements based on a model with Teff= 13 100 K and log (g) = 4.0. Even-Z elements through nickel show minor deviations from solar abundances. Anomalies among the odd-Z elements through copper are mostly small. Beyond the iron peak, a huge scatter is found. Enormous enhancements are found for the elements rhenium through mercury (Z= 75–80). We note the presence of Th iii in the spectrum. The abundance pattern of the heaviest elements resembles the N= 126 r-process peak of solar material, though not in detail. An odd-Z anomaly appears at the triplet (Zr Nb Mo), and there is a large abundance jump between Xe (Z= 54) and Ba (Z= 56). These are signatures of chemical fractionation. We find a significant correlation of the abundance excesses with second ionization potentials for elements with Z > 30. If this is not a red herring (false lead), it indicates the relevance of photospheric or near-photospheric processes. Large excesses (4–6 dex) require diffusion from deeper layers with the elements passing through a number of ionization stages. That would make the correlation with second ionization potential puzzling. We explore a model with mass accretion of exotic material followed by the more commonly accepted differentiation by diffusion. That model leads to a number of predictions which challenge future work. New observations confirm the orbital elements of Gieseking and Karimie, apart from the systemic velocity, which has increased. Likely primary and secondary masses are near 3.3 and 1.6 M⊙, with a separation of ca. 0.25 au. New atomic structure calculations are presented in two appendices. These include partition functions for the first through third spectra of Ru, Re and Os, as well as oscillator strengths in the Re ii spectrum
publishDate 2010
dc.date.none.fl_str_mv 2010-06
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/11336/12982
Cowley, C. R.; Hubrig, S.; Palmeri, P.; Quinet, P.; Biémont, É.; et al.; HD 65949: Rosetta stone or red herring; Oxford University Press; Monthly Notices Of The Royal Astronomical Society; 405; 2; 6-2010; 1271-1284
0035-8711
url http://hdl.handle.net/11336/12982
identifier_str_mv Cowley, C. R.; Hubrig, S.; Palmeri, P.; Quinet, P.; Biémont, É.; et al.; HD 65949: Rosetta stone or red herring; Oxford University Press; Monthly Notices Of The Royal Astronomical Society; 405; 2; 6-2010; 1271-1284
0035-8711
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/405/2/1271/1185259/HD-65949-Rosetta-stone-or-red-herring
info:eu-repo/semantics/altIdentifier/doi/10.1111/j.1365-2966.2010.16529.x
info:eu-repo/semantics/altIdentifier/url/https://arxiv.org/abs/1002.2945
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 Oxford University Press
publisher.none.fl_str_mv Oxford University Press
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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