Ca II triplet spectroscopy of Small Magellanic Cloud red giants. IV. Abundances for a large sample of field stars and comparison with the cluster sample

Autores
Parisi, Maria Celeste; Geisler, D.; Carraro, G.; Claria Olmedo, Juan Jose; Villanova, S.; Gramajo, Luciana Veronica; Sarajedini, A.; Grocholski, A.
Año de publicación
2016
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
This paper represents a major step forward in the systematic and homogeneous study of Small Magellanic Cloud (SMC) star clusters and field stars carried out by applying the Calcium Triplet technique. We present in this study the radial velocity and metallicity of approximately 400 red giant stars in 15 SMC fields, with typical errors of about 7 km/sec and 0.16 dex respectively. We added to this information our previously determined metallicity values for 29 clusters and approximately 350 field stars using the identical techniques. Using this enlarged sample, we analize the metallicity distribution and gradient in this galaxy. We also compare the chemical properties of the clusters and of their surrounding fields. We find a number of surprising results. While the clusters, taken as a whole, show no strong evidence for a metallicity gradient, the field stars exhibit a clear negative gradient in the inner region of the SMC consistent with the recent results of Dobbie et al. (2014b). For distances to the center of the galaxy less than 4 degrees, field stars show a considerable smaller metallicity dispersion than that of the clusters. However, in the external SMC regions, clusters and field stars exhibit similar metallicity dispersions. Moreover, in the inner region of the SMC, clusters appear to be concentrated in two groups: one more metal-poor and another more metal-rich than field stars. Individually considered, neither cluster group presents a metallicity gradient. Most surprisingly, the metallicity gradient for both stellar populations (clusters and field stars) appears to reverse sign in the outer regions of the SMC. The difference between the cluster metallicity and the mean metallicity of the surrounding field stars turns out to be a strong function of the cluster metallicity. These results could be indicating different chemical evolution histories for these two stellar populations. They could also indicate variations in the chemical behavior of the SMC in its internal and external regions. 
Fil: Parisi, Maria Celeste. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba. Departamento de Astrofísica Estelar; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad de Concepción; Chile
Fil: Geisler, D.. Universidad de Concepción; Chile
Fil: Carraro, G.. European Southern Observatory; Chile
Fil: Claria Olmedo, Juan Jose. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Villanova, S.. Universidad de Concepción; Chile
Fil: Gramajo, Luciana Veronica. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba; Argentina
Fil: Sarajedini, A.. University of Florida; Estados Unidos
Fil: Grocholski, A.. State University of Louisiana; Estados Unidos
Materia
Small Magellanic Cloud
Spectroscopy
Field stars
Star clusters
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/108673
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/108673
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Ca II triplet spectroscopy of Small Magellanic Cloud red giants. IV. Abundances for a large sample of field stars and comparison with the cluster sampleParisi, Maria CelesteGeisler, D.Carraro, G.Claria Olmedo, Juan JoseVillanova, S.Gramajo, Luciana VeronicaSarajedini, A.Grocholski, A.Small Magellanic CloudSpectroscopyField starsStar clustershttps://purl.org/becyt/ford/1.7https://purl.org/becyt/ford/1This paper represents a major step forward in the systematic and homogeneous study of Small Magellanic Cloud (SMC) star clusters and field stars carried out by applying the Calcium Triplet technique. We present in this study the radial velocity and metallicity of approximately 400 red giant stars in 15 SMC fields, with typical errors of about 7 km/sec and 0.16 dex respectively. We added to this information our previously determined metallicity values for 29 clusters and approximately 350 field stars using the identical techniques. Using this enlarged sample, we analize the metallicity distribution and gradient in this galaxy. We also compare the chemical properties of the clusters and of their surrounding fields. We find a number of surprising results. While the clusters, taken as a whole, show no strong evidence for a metallicity gradient, the field stars exhibit a clear negative gradient in the inner region of the SMC consistent with the recent results of Dobbie et al. (2014b). For distances to the center of the galaxy less than 4 degrees, field stars show a considerable smaller metallicity dispersion than that of the clusters. However, in the external SMC regions, clusters and field stars exhibit similar metallicity dispersions. Moreover, in the inner region of the SMC, clusters appear to be concentrated in two groups: one more metal-poor and another more metal-rich than field stars. Individually considered, neither cluster group presents a metallicity gradient. Most surprisingly, the metallicity gradient for both stellar populations (clusters and field stars) appears to reverse sign in the outer regions of the SMC. The difference between the cluster metallicity and the mean metallicity of the surrounding field stars turns out to be a strong function of the cluster metallicity. These results could be indicating different chemical evolution histories for these two stellar populations. They could also indicate variations in the chemical behavior of the SMC in its internal and external regions. Fil: Parisi, Maria Celeste. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba. Departamento de Astrofísica Estelar; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad de Concepción; ChileFil: Geisler, D.. Universidad de Concepción; ChileFil: Carraro, G.. European Southern Observatory; ChileFil: Claria Olmedo, Juan Jose. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Villanova, S.. Universidad de Concepción; ChileFil: Gramajo, Luciana Veronica. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba; ArgentinaFil: Sarajedini, A.. University of Florida; Estados UnidosFil: Grocholski, A.. State University of Louisiana; Estados UnidosIOP Publishing2016-10info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/108673Parisi, Maria Celeste; Geisler, D.; Carraro, G.; Claria Olmedo, Juan Jose; Villanova, S.; et al.; Ca II triplet spectroscopy of Small Magellanic Cloud red giants. IV. Abundances for a large sample of field stars and comparison with the cluster sample; IOP Publishing; Astronomical Journal; 10-20160004-6256CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://iopscience.iop.org/article/10.3847/0004-6256/152/3/58info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T09:34:44Zoai:ri.conicet.gov.ar:11336/108673instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-29 09:34:44.988CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Ca II triplet spectroscopy of Small Magellanic Cloud red giants. IV. Abundances for a large sample of field stars and comparison with the cluster sample
title Ca II triplet spectroscopy of Small Magellanic Cloud red giants. IV. Abundances for a large sample of field stars and comparison with the cluster sample
spellingShingle Ca II triplet spectroscopy of Small Magellanic Cloud red giants. IV. Abundances for a large sample of field stars and comparison with the cluster sample
Parisi, Maria Celeste
Small Magellanic Cloud
Spectroscopy
Field stars
Star clusters
title_short Ca II triplet spectroscopy of Small Magellanic Cloud red giants. IV. Abundances for a large sample of field stars and comparison with the cluster sample
title_full Ca II triplet spectroscopy of Small Magellanic Cloud red giants. IV. Abundances for a large sample of field stars and comparison with the cluster sample
title_fullStr Ca II triplet spectroscopy of Small Magellanic Cloud red giants. IV. Abundances for a large sample of field stars and comparison with the cluster sample
title_full_unstemmed Ca II triplet spectroscopy of Small Magellanic Cloud red giants. IV. Abundances for a large sample of field stars and comparison with the cluster sample
title_sort Ca II triplet spectroscopy of Small Magellanic Cloud red giants. IV. Abundances for a large sample of field stars and comparison with the cluster sample
dc.creator.none.fl_str_mv Parisi, Maria Celeste
Geisler, D.
Carraro, G.
Claria Olmedo, Juan Jose
Villanova, S.
Gramajo, Luciana Veronica
Sarajedini, A.
Grocholski, A.
author Parisi, Maria Celeste
author_facet Parisi, Maria Celeste
Geisler, D.
Carraro, G.
Claria Olmedo, Juan Jose
Villanova, S.
Gramajo, Luciana Veronica
Sarajedini, A.
Grocholski, A.
author_role author
author2 Geisler, D.
Carraro, G.
Claria Olmedo, Juan Jose
Villanova, S.
Gramajo, Luciana Veronica
Sarajedini, A.
Grocholski, A.
author2_role author
author
author
author
author
author
author
dc.subject.none.fl_str_mv Small Magellanic Cloud
Spectroscopy
Field stars
Star clusters
topic Small Magellanic Cloud
Spectroscopy
Field stars
Star clusters
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.7
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv This paper represents a major step forward in the systematic and homogeneous study of Small Magellanic Cloud (SMC) star clusters and field stars carried out by applying the Calcium Triplet technique. We present in this study the radial velocity and metallicity of approximately 400 red giant stars in 15 SMC fields, with typical errors of about 7 km/sec and 0.16 dex respectively. We added to this information our previously determined metallicity values for 29 clusters and approximately 350 field stars using the identical techniques. Using this enlarged sample, we analize the metallicity distribution and gradient in this galaxy. We also compare the chemical properties of the clusters and of their surrounding fields. We find a number of surprising results. While the clusters, taken as a whole, show no strong evidence for a metallicity gradient, the field stars exhibit a clear negative gradient in the inner region of the SMC consistent with the recent results of Dobbie et al. (2014b). For distances to the center of the galaxy less than 4 degrees, field stars show a considerable smaller metallicity dispersion than that of the clusters. However, in the external SMC regions, clusters and field stars exhibit similar metallicity dispersions. Moreover, in the inner region of the SMC, clusters appear to be concentrated in two groups: one more metal-poor and another more metal-rich than field stars. Individually considered, neither cluster group presents a metallicity gradient. Most surprisingly, the metallicity gradient for both stellar populations (clusters and field stars) appears to reverse sign in the outer regions of the SMC. The difference between the cluster metallicity and the mean metallicity of the surrounding field stars turns out to be a strong function of the cluster metallicity. These results could be indicating different chemical evolution histories for these two stellar populations. They could also indicate variations in the chemical behavior of the SMC in its internal and external regions. 
Fil: Parisi, Maria Celeste. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba. Departamento de Astrofísica Estelar; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad de Concepción; Chile
Fil: Geisler, D.. Universidad de Concepción; Chile
Fil: Carraro, G.. European Southern Observatory; Chile
Fil: Claria Olmedo, Juan Jose. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Villanova, S.. Universidad de Concepción; Chile
Fil: Gramajo, Luciana Veronica. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba; Argentina
Fil: Sarajedini, A.. University of Florida; Estados Unidos
Fil: Grocholski, A.. State University of Louisiana; Estados Unidos
description This paper represents a major step forward in the systematic and homogeneous study of Small Magellanic Cloud (SMC) star clusters and field stars carried out by applying the Calcium Triplet technique. We present in this study the radial velocity and metallicity of approximately 400 red giant stars in 15 SMC fields, with typical errors of about 7 km/sec and 0.16 dex respectively. We added to this information our previously determined metallicity values for 29 clusters and approximately 350 field stars using the identical techniques. Using this enlarged sample, we analize the metallicity distribution and gradient in this galaxy. We also compare the chemical properties of the clusters and of their surrounding fields. We find a number of surprising results. While the clusters, taken as a whole, show no strong evidence for a metallicity gradient, the field stars exhibit a clear negative gradient in the inner region of the SMC consistent with the recent results of Dobbie et al. (2014b). For distances to the center of the galaxy less than 4 degrees, field stars show a considerable smaller metallicity dispersion than that of the clusters. However, in the external SMC regions, clusters and field stars exhibit similar metallicity dispersions. Moreover, in the inner region of the SMC, clusters appear to be concentrated in two groups: one more metal-poor and another more metal-rich than field stars. Individually considered, neither cluster group presents a metallicity gradient. Most surprisingly, the metallicity gradient for both stellar populations (clusters and field stars) appears to reverse sign in the outer regions of the SMC. The difference between the cluster metallicity and the mean metallicity of the surrounding field stars turns out to be a strong function of the cluster metallicity. These results could be indicating different chemical evolution histories for these two stellar populations. They could also indicate variations in the chemical behavior of the SMC in its internal and external regions. 
publishDate 2016
dc.date.none.fl_str_mv 2016-10
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
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://hdl.handle.net/11336/108673
Parisi, Maria Celeste; Geisler, D.; Carraro, G.; Claria Olmedo, Juan Jose; Villanova, S.; et al.; Ca II triplet spectroscopy of Small Magellanic Cloud red giants. IV. Abundances for a large sample of field stars and comparison with the cluster sample; IOP Publishing; Astronomical Journal; 10-2016
0004-6256
CONICET Digital
CONICET
url http://hdl.handle.net/11336/108673
identifier_str_mv Parisi, Maria Celeste; Geisler, D.; Carraro, G.; Claria Olmedo, Juan Jose; Villanova, S.; et al.; Ca II triplet spectroscopy of Small Magellanic Cloud red giants. IV. Abundances for a large sample of field stars and comparison with the cluster sample; IOP Publishing; Astronomical Journal; 10-2016
0004-6256
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/https://iopscience.iop.org/article/10.3847/0004-6256/152/3/58
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv IOP Publishing
publisher.none.fl_str_mv IOP Publishing
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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score 13.070432

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