A spectroscopy study of nearby late-type stars, possible members of stellar kinematic groups

Context. Nearby late-type stars are excellent targets for seeking young objects in stellar associations and moving groups. The origin of these structures is still misunderstood, and lists of moving group members often change with time and also from author to author. Most members of these groups have...

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Detalles Bibliográficos
Autores: Maldonado, J., Martínez Arnáiz, R. M., Eiroa, C., Montes Gutiérrez, David, Montesinos, B.
Tipo de recurso: artículo
Fecha de publicación:2010
País:España
Institución:Universidad Complutense de Madrid (UCM)
Repositorio:Docta Complutense
Idioma:inglés
OAI Identifier:oai:docta.ucm.es:20.500.14352/45051
Acceso en línea:https://hdl.handle.net/20.500.14352/45051
Access Level:acceso abierto
Palabra clave:52
Solar-type stars
Main-sequence stars
CA-II H
Ursa-Major group
Velocity standard stars
Young moving groups
Chromospherically active binaries
High-resolution spectroscopy
Mean radial-velocities
Planet search program
Astrofísica
Astronomía (Física)
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spelling A spectroscopy study of nearby late-type stars, possible members of stellar kinematic groupsMaldonado, J.Martínez Arnáiz, R. M.Eiroa, C.Montes Gutiérrez, DavidMontesinos, B.52Solar-type starsMain-sequence starsCA-II HUrsa-Major groupVelocity standard starsYoung moving groupsChromospherically active binariesHigh-resolution spectroscopyMean radial-velocitiesPlanet search programAstrofísicaAstronomía (Física)Context. Nearby late-type stars are excellent targets for seeking young objects in stellar associations and moving groups. The origin of these structures is still misunderstood, and lists of moving group members often change with time and also from author to author. Most members of these groups have been identified by means of kinematic criteria, leading to an important contamination of previous lists by old field stars. Aims. We attempt to identify unambiguous moving group members among a sample of nearby-late type stars by studying their kinematics, lithium abundance, chromospheric activity, and other age-related properties. Methods. High-resolution echelle spectra (R ~ 57 000) of a sample of nearby late-type stars are used to derive accurate radial velocities that are combined with the precise Hipparcos parallaxes and proper motions to compute galactic-spatial velocity components. Stars are classified as possible members of the classical moving groups according to their kinematics. The spectra are also used to study several age-related properties for young late-type stars, i.e., the equivalent width of the lithium Li i 6707.8 Å line or the R'_HK index. Additional information like X-ray fluxes from the ROSAT All-Sky Survey or the presence of debris discs is also taken into account. The different age estimators are compared and the moving group membership of the kinematically selected candidates are discussed. Results. From a total list of 405 nearby stars, 102 have been classified as moving group candidates according to their kinematics. i.e., only ~25.2% of the sample. The number reduces when age estimates are considered, and only 26 moving group candidates (25.5% of the 102 candidates) have ages in agreement with the star having the same age as an MG member.EDP ScienciesUniversidad Complutense de Madrid20102010-10-0120102010-10-01journal articlehttp://purl.org/coar/resource_type/c_6501info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/20.500.14352/45051reponame:Docta Complutenseinstname:Universidad Complutense de Madrid (UCM)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccessoai:docta.ucm.es:20.500.14352/450512026-06-02T12:44:21Z
dc.title.none.fl_str_mv A spectroscopy study of nearby late-type stars, possible members of stellar kinematic groups
title A spectroscopy study of nearby late-type stars, possible members of stellar kinematic groups
spellingShingle A spectroscopy study of nearby late-type stars, possible members of stellar kinematic groups
Maldonado, J.
52
Solar-type stars
Main-sequence stars
CA-II H
Ursa-Major group
Velocity standard stars
Young moving groups
Chromospherically active binaries
High-resolution spectroscopy
Mean radial-velocities
Planet search program
Astrofísica
Astronomía (Física)
title_short A spectroscopy study of nearby late-type stars, possible members of stellar kinematic groups
title_full A spectroscopy study of nearby late-type stars, possible members of stellar kinematic groups
title_fullStr A spectroscopy study of nearby late-type stars, possible members of stellar kinematic groups
title_full_unstemmed A spectroscopy study of nearby late-type stars, possible members of stellar kinematic groups
title_sort A spectroscopy study of nearby late-type stars, possible members of stellar kinematic groups
dc.creator.none.fl_str_mv Maldonado, J.
Martínez Arnáiz, R. M.
Eiroa, C.
Montes Gutiérrez, David
Montesinos, B.
author Maldonado, J.
author_facet Maldonado, J.
Martínez Arnáiz, R. M.
Eiroa, C.
Montes Gutiérrez, David
Montesinos, B.
author_role author
author2 Martínez Arnáiz, R. M.
Eiroa, C.
Montes Gutiérrez, David
Montesinos, B.
author2_role author
author
author
author
dc.contributor.none.fl_str_mv Universidad Complutense de Madrid
dc.subject.none.fl_str_mv 52
Solar-type stars
Main-sequence stars
CA-II H
Ursa-Major group
Velocity standard stars
Young moving groups
Chromospherically active binaries
High-resolution spectroscopy
Mean radial-velocities
Planet search program
Astrofísica
Astronomía (Física)
topic 52
Solar-type stars
Main-sequence stars
CA-II H
Ursa-Major group
Velocity standard stars
Young moving groups
Chromospherically active binaries
High-resolution spectroscopy
Mean radial-velocities
Planet search program
Astrofísica
Astronomía (Física)
description Context. Nearby late-type stars are excellent targets for seeking young objects in stellar associations and moving groups. The origin of these structures is still misunderstood, and lists of moving group members often change with time and also from author to author. Most members of these groups have been identified by means of kinematic criteria, leading to an important contamination of previous lists by old field stars. Aims. We attempt to identify unambiguous moving group members among a sample of nearby-late type stars by studying their kinematics, lithium abundance, chromospheric activity, and other age-related properties. Methods. High-resolution echelle spectra (R ~ 57 000) of a sample of nearby late-type stars are used to derive accurate radial velocities that are combined with the precise Hipparcos parallaxes and proper motions to compute galactic-spatial velocity components. Stars are classified as possible members of the classical moving groups according to their kinematics. The spectra are also used to study several age-related properties for young late-type stars, i.e., the equivalent width of the lithium Li i 6707.8 Å line or the R'_HK index. Additional information like X-ray fluxes from the ROSAT All-Sky Survey or the presence of debris discs is also taken into account. The different age estimators are compared and the moving group membership of the kinematically selected candidates are discussed. Results. From a total list of 405 nearby stars, 102 have been classified as moving group candidates according to their kinematics. i.e., only ~25.2% of the sample. The number reduces when age estimates are considered, and only 26 moving group candidates (25.5% of the 102 candidates) have ages in agreement with the star having the same age as an MG member.
publishDate 2010
dc.date.none.fl_str_mv 2010
2010-10-01
2010
2010-10-01
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/20.500.14352/45051
url https://hdl.handle.net/20.500.14352/45051
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv EDP Sciencies
publisher.none.fl_str_mv EDP Sciencies
dc.source.none.fl_str_mv reponame:Docta Complutense
instname:Universidad Complutense de Madrid (UCM)
instname_str Universidad Complutense de Madrid (UCM)
reponame_str Docta Complutense
collection Docta Complutense
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15.300719

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