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
- Institución
- Consejo Nacional de Investigaciones Científicas y Técnicas
- OAI Identificador
- oai:ri.conicet.gov.ar:11336/12982
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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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13.070432 |