Pismis 20: One or two clusters?

Autores
Orsatti, Ana María; Vega, Ema Irene; Marraco, Hugo Gustavo
Año de publicación
2003
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
We present UBVRI polarimetric observations of stars in the direction of the open cluster Pismis 20 and WR 67. It is found that the observed members segregate polarimetrically into two groups, with different associated mean Pmax (4.31 and 6.08% respectively). Although in the literature these stars are considered as members of the same cluster, the polarized light from these groups clearly differs. There are two possible explanations: very efficient polarizing dust particles exists between certain members of the cluster; or else Pismis 20 is composed of different groupings superimposed along the line of sight. WR 67 belongs to the group more affected by the dust.
Facultad de Ciencias Astronómicas y Geofísicas
Instituto de Astrofísica de La Plata
Materia
Ciencias Astronómicas
ISM: dust, extinction
Open clusters and associations: individual: Pis20
Stars: individual: WR67
Technique: polarimetric
Nivel de accesibilidad
acceso abierto
Condiciones de uso
http://creativecommons.org/licenses/by-nc-sa/4.0/
Repositorio
SEDICI (UNLP)
Institución
Universidad Nacional de La Plata
OAI Identificador
oai:sedici.unlp.edu.ar:10915/84862
Acceder
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oai_identifier_str oai:sedici.unlp.edu.ar:10915/84862
network_acronym_str SEDICI
repository_id_str 1329
network_name_str SEDICI (UNLP)
spelling Pismis 20: One or two clusters?Orsatti, Ana MaríaVega, Ema IreneMarraco, Hugo GustavoCiencias AstronómicasISM: dust, extinctionOpen clusters and associations: individual: Pis20Stars: individual: WR67Technique: polarimetricWe present <i>UBVRI</i> polarimetric observations of stars in the direction of the open cluster Pismis 20 and WR 67. It is found that the observed members segregate polarimetrically into two groups, with different associated mean P<SUB>max</SUB> (4.31 and 6.08% respectively). Although in the literature these stars are considered as members of the same cluster, the polarized light from these groups clearly differs. There are two possible explanations: very efficient polarizing dust particles exists between certain members of the cluster; or else Pismis 20 is composed of different groupings superimposed along the line of sight. WR 67 belongs to the group more affected by the dust.Facultad de Ciencias Astronómicas y GeofísicasInstituto de Astrofísica de La Plata2003info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdf135-140http://sedici.unlp.edu.ar/handle/10915/84862enginfo:eu-repo/semantics/altIdentifier/issn/0004-6361info:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361:20030919info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc-sa/4.0/Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2025-09-29T11:16:15Zoai:sedici.unlp.edu.ar:10915/84862Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-09-29 11:16:16.208SEDICI (UNLP) - Universidad Nacional de La Platafalse
dc.title.none.fl_str_mv Pismis 20: One or two clusters?
title Pismis 20: One or two clusters?
spellingShingle Pismis 20: One or two clusters?
Orsatti, Ana María
Ciencias Astronómicas
ISM: dust, extinction
Open clusters and associations: individual: Pis20
Stars: individual: WR67
Technique: polarimetric
title_short Pismis 20: One or two clusters?
title_full Pismis 20: One or two clusters?
title_fullStr Pismis 20: One or two clusters?
title_full_unstemmed Pismis 20: One or two clusters?
title_sort Pismis 20: One or two clusters?
dc.creator.none.fl_str_mv Orsatti, Ana María
Vega, Ema Irene
Marraco, Hugo Gustavo
author Orsatti, Ana María
author_facet Orsatti, Ana María
Vega, Ema Irene
Marraco, Hugo Gustavo
author_role author
author2 Vega, Ema Irene
Marraco, Hugo Gustavo
author2_role author
author
dc.subject.none.fl_str_mv Ciencias Astronómicas
ISM: dust, extinction
Open clusters and associations: individual: Pis20
Stars: individual: WR67
Technique: polarimetric
topic Ciencias Astronómicas
ISM: dust, extinction
Open clusters and associations: individual: Pis20
Stars: individual: WR67
Technique: polarimetric
dc.description.none.fl_txt_mv We present <i>UBVRI</i> polarimetric observations of stars in the direction of the open cluster Pismis 20 and WR 67. It is found that the observed members segregate polarimetrically into two groups, with different associated mean P<SUB>max</SUB> (4.31 and 6.08% respectively). Although in the literature these stars are considered as members of the same cluster, the polarized light from these groups clearly differs. There are two possible explanations: very efficient polarizing dust particles exists between certain members of the cluster; or else Pismis 20 is composed of different groupings superimposed along the line of sight. WR 67 belongs to the group more affected by the dust.
Facultad de Ciencias Astronómicas y Geofísicas
Instituto de Astrofísica de La Plata
description We present <i>UBVRI</i> polarimetric observations of stars in the direction of the open cluster Pismis 20 and WR 67. It is found that the observed members segregate polarimetrically into two groups, with different associated mean P<SUB>max</SUB> (4.31 and 6.08% respectively). Although in the literature these stars are considered as members of the same cluster, the polarized light from these groups clearly differs. There are two possible explanations: very efficient polarizing dust particles exists between certain members of the cluster; or else Pismis 20 is composed of different groupings superimposed along the line of sight. WR 67 belongs to the group more affected by the dust.
publishDate 2003
dc.date.none.fl_str_mv 2003
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Articulo
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://sedici.unlp.edu.ar/handle/10915/84862
url http://sedici.unlp.edu.ar/handle/10915/84862
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/issn/0004-6361
info:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361:20030919
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-sa/4.0/
Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
eu_rights_str_mv openAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by-nc-sa/4.0/
Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
dc.format.none.fl_str_mv application/pdf
135-140
dc.source.none.fl_str_mv reponame:SEDICI (UNLP)
instname:Universidad Nacional de La Plata
instacron:UNLP
reponame_str SEDICI (UNLP)
collection SEDICI (UNLP)
instname_str Universidad Nacional de La Plata
instacron_str UNLP
institution UNLP
repository.name.fl_str_mv SEDICI (UNLP) - Universidad Nacional de La Plata
repository.mail.fl_str_mv alira@sedici.unlp.edu.ar
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