Detection of moving groups among early type stars

Our procedure to detect moving groups in the solar neighbourhood (Chen et al., 1997) in the four-dimensional space of the stellar velocity components and age has been improved. The method, which takes advantadge of non-parametric estimators of density distribution to avoid any a priori knowledge of...

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Detalles Bibliográficos
Autores: Asiain García, Ricard, Figueras Siñol, Francesca, Torra Roca, Jorge, Chen, B.
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:1999
País:España
Institución:Universidad de Barcelona
Repositorio:Dipòsit Digital de la UB
OAI Identifier:oai:diposit.ub.edu:2445/9224
Acceso en línea:https://hdl.handle.net/2445/9224
Access Level:acceso abierto
Palabra clave:Estels
Evolució estel·lar
Stars: early-type
Stars: fundamental parameters
Stars: Hertzsprung
Russel (HR) and C-M diagrams
Stars: kinematics galaxy: solar neighbourhood
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repository_id_str
spelling Detection of moving groups among early type starsAsiain García, RicardFigueras Siñol, FrancescaTorra Roca, JorgeChen, B.EstelsEvolució estel·larStars: early-typeStars: fundamental parametersStars: HertzsprungRussel (HR) and C-M diagramsStars: kinematics galaxy: solar neighbourhoodOur procedure to detect moving groups in the solar neighbourhood (Chen et al., 1997) in the four-dimensional space of the stellar velocity components and age has been improved. The method, which takes advantadge of non-parametric estimators of density distribution to avoid any a priori knowledge of the kinematic properties of these stellar groups, now includes the effect of observational errors on the process to select moving group stars, uses a better estimation of the density distribution of the total sample and field stars, and classifies moving group stars using all the available information. It is applied here to an accurately selected sample of early-type stars with known radial velocities and Strömgren photometry. Astrometric data are taken from the HIPPARCOS catalogue (ESA, 1997), which results in an important decrease in the observational errors with respect to ground-based data, and ensures the uniformity of the observed data. Both the improvement of our method and the use of precise astrometric data have allowed us not only to confirm the existence of classical moving groups, but also to detect finer structures that in several cases can be related to kinematic properties of nearby open clusters or associations.EDP Sciences1999info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://hdl.handle.net/2445/9224Articles publicats en revistes (Física Quàntica i Astrofísica)reponame:Dipòsit Digital de la UBinstname:Universidad de BarcelonaInglésAstronomy and Astrophysics Supplement Series, 1999, vol. 341, p. 427-436.(c) The European Southern Observatory, 1999info:eu-repo/semantics/openAccessoai:diposit.ub.edu:2445/92242026-05-27T06:46:51Z
dc.title.none.fl_str_mv Detection of moving groups among early type stars
title Detection of moving groups among early type stars
spellingShingle Detection of moving groups among early type stars
Asiain García, Ricard
Estels
Evolució estel·lar
Stars: early-type
Stars: fundamental parameters
Stars: Hertzsprung
Russel (HR) and C-M diagrams
Stars: kinematics galaxy: solar neighbourhood
title_short Detection of moving groups among early type stars
title_full Detection of moving groups among early type stars
title_fullStr Detection of moving groups among early type stars
title_full_unstemmed Detection of moving groups among early type stars
title_sort Detection of moving groups among early type stars
dc.creator.none.fl_str_mv Asiain García, Ricard
Figueras Siñol, Francesca
Torra Roca, Jorge
Chen, B.
author Asiain García, Ricard
author_facet Asiain García, Ricard
Figueras Siñol, Francesca
Torra Roca, Jorge
Chen, B.
author_role author
author2 Figueras Siñol, Francesca
Torra Roca, Jorge
Chen, B.
author2_role author
author
author
dc.subject.none.fl_str_mv Estels
Evolució estel·lar
Stars: early-type
Stars: fundamental parameters
Stars: Hertzsprung
Russel (HR) and C-M diagrams
Stars: kinematics galaxy: solar neighbourhood
topic Estels
Evolució estel·lar
Stars: early-type
Stars: fundamental parameters
Stars: Hertzsprung
Russel (HR) and C-M diagrams
Stars: kinematics galaxy: solar neighbourhood
description Our procedure to detect moving groups in the solar neighbourhood (Chen et al., 1997) in the four-dimensional space of the stellar velocity components and age has been improved. The method, which takes advantadge of non-parametric estimators of density distribution to avoid any a priori knowledge of the kinematic properties of these stellar groups, now includes the effect of observational errors on the process to select moving group stars, uses a better estimation of the density distribution of the total sample and field stars, and classifies moving group stars using all the available information. It is applied here to an accurately selected sample of early-type stars with known radial velocities and Strömgren photometry. Astrometric data are taken from the HIPPARCOS catalogue (ESA, 1997), which results in an important decrease in the observational errors with respect to ground-based data, and ensures the uniformity of the observed data. Both the improvement of our method and the use of precise astrometric data have allowed us not only to confirm the existence of classical moving groups, but also to detect finer structures that in several cases can be related to kinematic properties of nearby open clusters or associations.
publishDate 1999
dc.date.none.fl_str_mv 1999
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/2445/9224
url https://hdl.handle.net/2445/9224
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Astronomy and Astrophysics Supplement Series, 1999, vol. 341, p. 427-436.
dc.rights.none.fl_str_mv (c) The European Southern Observatory, 1999
info:eu-repo/semantics/openAccess
rights_invalid_str_mv (c) The European Southern Observatory, 1999
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 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:Dipòsit Digital de la UB
instname:Universidad de Barcelona
instname_str Universidad de Barcelona
reponame_str Dipòsit Digital de la UB
collection Dipòsit Digital de la UB
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15.300724

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