Absolute dimensions of eclipsing binaries: XXIX. the Am-type systems SW Canis Majoris and HW Canis Majoris

Context. Accurate physical properties of eclipsing stars provide important constraints on models of stellar structure and evolution, especially when combined with spectroscopic information on their chemical composition. Empirical calibrations of the data also lead to accurate mass and radius estimat...

Descripción completa

Detalles Bibliográficos
Autores: Torres, G., Clausen, J. V., Bruntt, H., Claret, A., Andersen, J., Nordström, B., Stefanik, R.P., Latham, D. W.
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2012
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/413001
Acceso en línea:http://hdl.handle.net/10261/413001
Access Level:acceso abierto
Palabra clave:Binaries: eclipsing
Stars: abundances
Stars: chemically peculiar
Stars: fundamental parameters
Stars: individual: HW CMa
Stars: individual: SW CMa
id ES_f8064e49b0a879877b7cdeec066ff2b4
oai_identifier_str oai:digital.csic.es:10261/413001
network_acronym_str ES
network_name_str España
repository_id_str
spelling Absolute dimensions of eclipsing binaries: XXIX. the Am-type systems SW Canis Majoris and HW Canis MajorisTorres, G.Clausen, J. V.Bruntt, H.Claret, A.Andersen, J.Nordström, B.Stefanik, R.P.Latham, D. W.Binaries: eclipsingStars: abundancesStars: chemically peculiarStars: fundamental parametersStars: individual: HW CMaStars: individual: SW CMaContext. Accurate physical properties of eclipsing stars provide important constraints on models of stellar structure and evolution, especially when combined with spectroscopic information on their chemical composition. Empirical calibrations of the data also lead to accurate mass and radius estimates for exoplanet host stars. Finally, accurate data for unusual stellar subtypes, such as Am stars, also help to unravel the cause(s) of their peculiarities.Aims. We aim to determine the masses, radii, effective temperatures, detailed chemical composition and rotational speeds for the Am-type eclipsing binaries SW CMa (A4-5m) and HW CMa (A6m) and compare them with similar normal stars.Methods. Accurate radial velocities from the Digital Speedometers of the Harvard-Smithsonian Center for Astrophysics were combined with previously published uvby photometry to determine precise physical parameters for the four stars. A detailed abundance analysis was performed from high-resolution spectra obtained with the Nordic Optical Telescope (La Palma).Results. We find the masses of the (relatively evolved) stars in SW CMa to be 2.10 and 2.24 M ̇, with radii of 2.50 and 3.01 R ̇, while the (essentially zero-age) stars in HW CMa have masses of 1.72 and 1.78 M ̇, radii of 1.64 and 1.66 R ̇-all with errors well below 2%. Detailed atmospheric abundances for one or both components were determined for 14 elements in SW CMa ([Fe/H] = +0.49/+0.61 dex) and 16 in HW CMa ([Fe/H] = +0.33/+0.32 dex); both abundance patterns are characteristic of metallic-line stars. Both systems are well fit by current stellar evolution models for assumed bulk abundances of [Fe/H] = +0.05 and +0.23, respectively ([α/Fe] = 0.0), and ages of ∼700 Myr and 160 Myr. © 2012 ESO.We dedicate this work to our long-time friend and col- league Jens Viggo Clausen, who passed away as this paper was being prepared for submission. He was a key participant in this series of articles, and will be remembered for his high standards, dedication, and careful attention to detail. Many of the spectroscopic observations at CfA were obtained by P. Berlind, J. Caruso, R. Davis, E. Horine, A. Milone, and J. Zajac. We are grateful to E. Sturm for providing his original disentangling code, and to him and J. D. Pritchard for modifying it for use on Linux/Unix computer systems. The anonymous referee is also thanked for a number of helpful comments. The projects “Stellar structure and evolution – new challenges from ground and space observations” and “Stars: Central engines of the evolution of the Universe”, carried out at Copenhagen University and Aarhus University, are supported by the Danish National Science Research Council. G.T. acknowledges partial support from NSF grant AST- 1007992. The following internet-based resources were used in the research for this paper: the NASA Astrophysics Data System, the SIMBAD database and the VizieR service operated by CDS, Strasbourg, France, and the arχiv scientific paper preprint service operated by Cornell University.Peer reviewedEDP SciencesNational Science Foundation (US)Danish National Research FoundationConsejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]202620262012info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionhttp://hdl.handle.net/10261/413001reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Ingléshttp://dx.doi.org/10.1051/0004-6361/201117795Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/4130012026-05-22T06:33:51Z
dc.title.none.fl_str_mv Absolute dimensions of eclipsing binaries: XXIX. the Am-type systems SW Canis Majoris and HW Canis Majoris
title Absolute dimensions of eclipsing binaries: XXIX. the Am-type systems SW Canis Majoris and HW Canis Majoris
spellingShingle Absolute dimensions of eclipsing binaries: XXIX. the Am-type systems SW Canis Majoris and HW Canis Majoris
Torres, G.
Binaries: eclipsing
Stars: abundances
Stars: chemically peculiar
Stars: fundamental parameters
Stars: individual: HW CMa
Stars: individual: SW CMa
title_short Absolute dimensions of eclipsing binaries: XXIX. the Am-type systems SW Canis Majoris and HW Canis Majoris
title_full Absolute dimensions of eclipsing binaries: XXIX. the Am-type systems SW Canis Majoris and HW Canis Majoris
title_fullStr Absolute dimensions of eclipsing binaries: XXIX. the Am-type systems SW Canis Majoris and HW Canis Majoris
title_full_unstemmed Absolute dimensions of eclipsing binaries: XXIX. the Am-type systems SW Canis Majoris and HW Canis Majoris
title_sort Absolute dimensions of eclipsing binaries: XXIX. the Am-type systems SW Canis Majoris and HW Canis Majoris
dc.creator.none.fl_str_mv Torres, G.
Clausen, J. V.
Bruntt, H.
Claret, A.
Andersen, J.
Nordström, B.
Stefanik, R.P.
Latham, D. W.
author Torres, G.
author_facet Torres, G.
Clausen, J. V.
Bruntt, H.
Claret, A.
Andersen, J.
Nordström, B.
Stefanik, R.P.
Latham, D. W.
author_role author
author2 Clausen, J. V.
Bruntt, H.
Claret, A.
Andersen, J.
Nordström, B.
Stefanik, R.P.
Latham, D. W.
author2_role author
author
author
author
author
author
author
dc.contributor.none.fl_str_mv National Science Foundation (US)
Danish National Research Foundation
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Binaries: eclipsing
Stars: abundances
Stars: chemically peculiar
Stars: fundamental parameters
Stars: individual: HW CMa
Stars: individual: SW CMa
topic Binaries: eclipsing
Stars: abundances
Stars: chemically peculiar
Stars: fundamental parameters
Stars: individual: HW CMa
Stars: individual: SW CMa
description Context. Accurate physical properties of eclipsing stars provide important constraints on models of stellar structure and evolution, especially when combined with spectroscopic information on their chemical composition. Empirical calibrations of the data also lead to accurate mass and radius estimates for exoplanet host stars. Finally, accurate data for unusual stellar subtypes, such as Am stars, also help to unravel the cause(s) of their peculiarities.
publishDate 2012
dc.date.none.fl_str_mv 2012
2026
2026
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Publisher's version
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/413001
url http://hdl.handle.net/10261/413001
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv http://dx.doi.org/10.1051/0004-6361/201117795
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv EDP Sciences
publisher.none.fl_str_mv EDP Sciences
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
_version_ 1869424963601039360
score 15,812429

Similares en LA Referencia