PLC distribution and classification of galactic oxygen-rich LPVs. II. confrontation with pulsation models

The kinematic and Period-Luminosity-Colour distribution of O-rich Long-Period Variable (LPV) stars of the solar neighbourhood is interpreted in terms of pulsation modes, masses and metallicities. It is first shown that, because of input physics imperfections, the periods and mean colours derived fro...

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Autores: Barthès, D., Luri Carrascoso, Xavier
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2001
País:España
Institución:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
Repositorio:Recercat. Dipósit de la Recerca de Catalunya
OAI Identifier:oai:recercat.cat:2445/161593
Acceso en línea:https://hdl.handle.net/2445/161593
Access Level:acceso abierto
Palabra clave:Evolució estel·lar
Cinemàtica galàctica
Stellar evolution
Galactic kinematics
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spelling PLC distribution and classification of galactic oxygen-rich LPVs. II. confrontation with pulsation modelsBarthès, D.Luri Carrascoso, XavierEvolució estel·larCinemàtica galàcticaStellar evolutionGalactic kinematicsThe kinematic and Period-Luminosity-Colour distribution of O-rich Long-Period Variable (LPV) stars of the solar neighbourhood is interpreted in terms of pulsation modes, masses and metallicities. It is first shown that, because of input physics imperfections, the periods and mean colours derived from the existing linear and nonlinear nonadiabatic models must significantly depart from the actual behaviour of the stars. As a consequence systematic corrections have to be applied, as a first approximation, to our linear model grid. These free parameters, as well as the mixing length, are calibrated on the LPVs of the LMC and of some globular clusters, assuming a mean mass of 1 Msun for the LMC Mira-like stars. Then, the masses and metallicities corresponding to the four kinematic/photometric populations of local LPVs are evaluated. The possibility of a varying mixing-length parameter is discussed and taken into account. Stars of the old disk appear pulsating in the fundamental mode: one group, mainly composed of Miras, has mean mass =~ 0.9 Msun and mean metallicity =~ 0.02, both strongly increasing with the period; a second group, slightly older and mainly composed of SRb's, has =~ 0.9 Msun and >~ 0.03 . Stars of the thin disk appear pulsating in the first and second overtones, with ~ 1.05 Msun, >0.75 Msun and >= 0.04 . Stars of the extended disk/halo appear pulsating in the fundamental mode, with =~ 1.1 Msun and =~ 0.01. The mixing-length parameter probably decreases along the AGB by no more than 15% per magnitude. The large, positive period corrections (more than 30% for the fundamental and 8% for the first overtone) that have to be applied to the LNA models used in this study do not seem to be explained by imperfect sub-photospheric physics alone, especially when nonlinear effects are taken into account. The origin of the extra period increase (at least 15% for the fundamental mode) may be the stellar wind, which was neglected by all pulsation codes up to now. Based on data from the HIPPARCOS astrometry satellite.EDP Sciences2020202020012020info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersion16 p.application/pdfhttps://hdl.handle.net/2445/161593Articles publicats en revistes (Física Quàntica i Astrofísica)reponame:Recercat. Dipósit de la Recerca de Catalunyainstname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)InglésReproducció del document publicat a: https://doi.org/10.1051/0004-6361:20000191Astronomy & Astrophysics, 2001, vol. 365, num. 2, p. 519-534https://doi.org/10.1051/0004-6361:20000191(c) The European Southern Observatory (ESO), 2001info:eu-repo/semantics/openAccessoai:recercat.cat:2445/1615932026-05-29T05:05:01Z
dc.title.none.fl_str_mv PLC distribution and classification of galactic oxygen-rich LPVs. II. confrontation with pulsation models
title PLC distribution and classification of galactic oxygen-rich LPVs. II. confrontation with pulsation models
spellingShingle PLC distribution and classification of galactic oxygen-rich LPVs. II. confrontation with pulsation models
Barthès, D.
Evolució estel·lar
Cinemàtica galàctica
Stellar evolution
Galactic kinematics
title_short PLC distribution and classification of galactic oxygen-rich LPVs. II. confrontation with pulsation models
title_full PLC distribution and classification of galactic oxygen-rich LPVs. II. confrontation with pulsation models
title_fullStr PLC distribution and classification of galactic oxygen-rich LPVs. II. confrontation with pulsation models
title_full_unstemmed PLC distribution and classification of galactic oxygen-rich LPVs. II. confrontation with pulsation models
title_sort PLC distribution and classification of galactic oxygen-rich LPVs. II. confrontation with pulsation models
dc.creator.none.fl_str_mv Barthès, D.
Luri Carrascoso, Xavier
author Barthès, D.
author_facet Barthès, D.
Luri Carrascoso, Xavier
author_role author
author2 Luri Carrascoso, Xavier
author2_role author
dc.subject.none.fl_str_mv Evolució estel·lar
Cinemàtica galàctica
Stellar evolution
Galactic kinematics
topic Evolució estel·lar
Cinemàtica galàctica
Stellar evolution
Galactic kinematics
description The kinematic and Period-Luminosity-Colour distribution of O-rich Long-Period Variable (LPV) stars of the solar neighbourhood is interpreted in terms of pulsation modes, masses and metallicities. It is first shown that, because of input physics imperfections, the periods and mean colours derived from the existing linear and nonlinear nonadiabatic models must significantly depart from the actual behaviour of the stars. As a consequence systematic corrections have to be applied, as a first approximation, to our linear model grid. These free parameters, as well as the mixing length, are calibrated on the LPVs of the LMC and of some globular clusters, assuming a mean mass of 1 Msun for the LMC Mira-like stars. Then, the masses and metallicities corresponding to the four kinematic/photometric populations of local LPVs are evaluated. The possibility of a varying mixing-length parameter is discussed and taken into account. Stars of the old disk appear pulsating in the fundamental mode: one group, mainly composed of Miras, has mean mass =~ 0.9 Msun and mean metallicity =~ 0.02, both strongly increasing with the period; a second group, slightly older and mainly composed of SRb's, has =~ 0.9 Msun and >~ 0.03 . Stars of the thin disk appear pulsating in the first and second overtones, with ~ 1.05 Msun, >0.75 Msun and >= 0.04 . Stars of the extended disk/halo appear pulsating in the fundamental mode, with =~ 1.1 Msun and =~ 0.01. The mixing-length parameter probably decreases along the AGB by no more than 15% per magnitude. The large, positive period corrections (more than 30% for the fundamental and 8% for the first overtone) that have to be applied to the LNA models used in this study do not seem to be explained by imperfect sub-photospheric physics alone, especially when nonlinear effects are taken into account. The origin of the extra period increase (at least 15% for the fundamental mode) may be the stellar wind, which was neglected by all pulsation codes up to now. Based on data from the HIPPARCOS astrometry satellite.
publishDate 2001
dc.date.none.fl_str_mv 2001
2020
2020
2020
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/2445/161593
url https://hdl.handle.net/2445/161593
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Reproducció del document publicat a: https://doi.org/10.1051/0004-6361:20000191
Astronomy & Astrophysics, 2001, vol. 365, num. 2, p. 519-534
https://doi.org/10.1051/0004-6361:20000191
dc.rights.none.fl_str_mv (c) The European Southern Observatory (ESO), 2001
info:eu-repo/semantics/openAccess
rights_invalid_str_mv (c) The European Southern Observatory (ESO), 2001
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 16 p.
application/pdf
dc.publisher.none.fl_str_mv EDP Sciences
publisher.none.fl_str_mv EDP Sciences
dc.source.none.fl_str_mv Articles publicats en revistes (Física Quàntica i Astrofísica)
reponame:Recercat. Dipósit de la Recerca de Catalunya
instname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
instname_str Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
reponame_str Recercat. Dipósit de la Recerca de Catalunya
collection Recercat. Dipósit de la Recerca de Catalunya
repository.name.fl_str_mv
repository.mail.fl_str_mv
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