Variability in NGC 3201 giant stars and its impact on their spectroscopic [Fe/H] determination

Autores
Llancaqueo Albornoz, Álvaro; Sandro, Villanova; Cortés, C. C.; Ahumada, Javier; Parisi, Maria Celeste
Año de publicación
2021
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
We present the analysis of 34 light curves in V and I of 17 giant stars in the globular cluster NGC 3201 to check if such stars are variable and if their variability has some kind of impact on the iron abundance as obtained from spectroscopic measurements. First, we computed the generalized Lomb-Scargle and phase dispersion minimization periodograms of the sample to check if the stars were variables. In this way, seven stars of the sample were found to be nonvariable, two stars are considered as possible variables, and eight stars were found to be variable, with periods ranging from 0.0881 ± 0.0001 to 0.5418 ± 0.0027 days. According to the literature, the variables have distinct values of [Fe I/H]: the three most metal-rich stars are in the red giant branch (RGB) stage, one has [Fe I/H] = -1.37 dex, while the other two have [Fe I/H] = -1.31 dex. The two most metal-poor variables have [Fe I/H] = -1.61 dex and [Fe I/H] = -1.62 dex, and are AGB stars; the remaining variables have [Fe I/H] = -1.44, -1.48, and -1.50 dex, the first two being RGB stars while the last is an AGB star. On the other hand, stars that appear to be nonvariable have -1.56 ≤ [Fe I/H] ≤ -1.40. We conclude that variability somehow affects the spectroscopic determination of the iron content of giant stars in NGC 3201, increasing the iron spread of the cluster. If variability is not taken into account, this spread could be incorrectly interpreted as due to an intrinsic iron spread affecting the stars of the cluster.
Fil: Llancaqueo Albornoz, Álvaro. Universidad de Concepción; Chile
Fil: Sandro, Villanova. Universidad de Concepción; Chile
Fil: Cortés, C. C.. Universidad de Concepción; Chile. Universidad del Bio Bio; Chile
Fil: Ahumada, Javier. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba; Argentina
Fil: Parisi, Maria Celeste. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Astronomía Teórica y Experimental. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba. Instituto de Astronomía Teórica y Experimental; Argentina. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba; Argentina
Materia
Globular star clusters
Stellar abundances
Solar and Stellar Astrophysics
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/173036
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/173036
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Variability in NGC 3201 giant stars and its impact on their spectroscopic [Fe/H] determinationLlancaqueo Albornoz, ÁlvaroSandro, VillanovaCortés, C. C.Ahumada, JavierParisi, Maria CelesteGlobular star clustersStellar abundancesSolar and Stellar Astrophysicshttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1We present the analysis of 34 light curves in V and I of 17 giant stars in the globular cluster NGC 3201 to check if such stars are variable and if their variability has some kind of impact on the iron abundance as obtained from spectroscopic measurements. First, we computed the generalized Lomb-Scargle and phase dispersion minimization periodograms of the sample to check if the stars were variables. In this way, seven stars of the sample were found to be nonvariable, two stars are considered as possible variables, and eight stars were found to be variable, with periods ranging from 0.0881 ± 0.0001 to 0.5418 ± 0.0027 days. According to the literature, the variables have distinct values of [Fe I/H]: the three most metal-rich stars are in the red giant branch (RGB) stage, one has [Fe I/H] = -1.37 dex, while the other two have [Fe I/H] = -1.31 dex. The two most metal-poor variables have [Fe I/H] = -1.61 dex and [Fe I/H] = -1.62 dex, and are AGB stars; the remaining variables have [Fe I/H] = -1.44, -1.48, and -1.50 dex, the first two being RGB stars while the last is an AGB star. On the other hand, stars that appear to be nonvariable have -1.56 ≤ [Fe I/H] ≤ -1.40. We conclude that variability somehow affects the spectroscopic determination of the iron content of giant stars in NGC 3201, increasing the iron spread of the cluster. If variability is not taken into account, this spread could be incorrectly interpreted as due to an intrinsic iron spread affecting the stars of the cluster.Fil: Llancaqueo Albornoz, Álvaro. Universidad de Concepción; ChileFil: Sandro, Villanova. Universidad de Concepción; ChileFil: Cortés, C. C.. Universidad de Concepción; Chile. Universidad del Bio Bio; ChileFil: Ahumada, Javier. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba; ArgentinaFil: Parisi, Maria Celeste. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Astronomía Teórica y Experimental. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba. Instituto de Astronomía Teórica y Experimental; Argentina. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba; ArgentinaIOP Publishing2021-02info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/173036Llancaqueo Albornoz, Álvaro; Sandro, Villanova; Cortés, C. C.; Ahumada, Javier; Parisi, Maria Celeste; Variability in NGC 3201 giant stars and its impact on their spectroscopic [Fe/H] determination; IOP Publishing; Astronomical Journal; 161; 2; 2-2021; 76-900004-62561538-3881CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://iopscience.iop.org/article/10.3847/1538-3881/abcf2finfo:eu-repo/semantics/altIdentifier/doi/10.3847/1538-3881/abcf2finfo:eu-repo/semantics/altIdentifier/arxiv/https://arxiv.org/abs/2012.00520info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T09:35:34Zoai:ri.conicet.gov.ar:11336/173036instacron: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 09:35:35.166CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Variability in NGC 3201 giant stars and its impact on their spectroscopic [Fe/H] determination
title Variability in NGC 3201 giant stars and its impact on their spectroscopic [Fe/H] determination
spellingShingle Variability in NGC 3201 giant stars and its impact on their spectroscopic [Fe/H] determination
Llancaqueo Albornoz, Álvaro
Globular star clusters
Stellar abundances
Solar and Stellar Astrophysics
title_short Variability in NGC 3201 giant stars and its impact on their spectroscopic [Fe/H] determination
title_full Variability in NGC 3201 giant stars and its impact on their spectroscopic [Fe/H] determination
title_fullStr Variability in NGC 3201 giant stars and its impact on their spectroscopic [Fe/H] determination
title_full_unstemmed Variability in NGC 3201 giant stars and its impact on their spectroscopic [Fe/H] determination
title_sort Variability in NGC 3201 giant stars and its impact on their spectroscopic [Fe/H] determination
dc.creator.none.fl_str_mv Llancaqueo Albornoz, Álvaro
Sandro, Villanova
Cortés, C. C.
Ahumada, Javier
Parisi, Maria Celeste
author Llancaqueo Albornoz, Álvaro
author_facet Llancaqueo Albornoz, Álvaro
Sandro, Villanova
Cortés, C. C.
Ahumada, Javier
Parisi, Maria Celeste
author_role author
author2 Sandro, Villanova
Cortés, C. C.
Ahumada, Javier
Parisi, Maria Celeste
author2_role author
author
author
author
dc.subject.none.fl_str_mv Globular star clusters
Stellar abundances
Solar and Stellar Astrophysics
topic Globular star clusters
Stellar abundances
Solar and Stellar Astrophysics
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv We present the analysis of 34 light curves in V and I of 17 giant stars in the globular cluster NGC 3201 to check if such stars are variable and if their variability has some kind of impact on the iron abundance as obtained from spectroscopic measurements. First, we computed the generalized Lomb-Scargle and phase dispersion minimization periodograms of the sample to check if the stars were variables. In this way, seven stars of the sample were found to be nonvariable, two stars are considered as possible variables, and eight stars were found to be variable, with periods ranging from 0.0881 ± 0.0001 to 0.5418 ± 0.0027 days. According to the literature, the variables have distinct values of [Fe I/H]: the three most metal-rich stars are in the red giant branch (RGB) stage, one has [Fe I/H] = -1.37 dex, while the other two have [Fe I/H] = -1.31 dex. The two most metal-poor variables have [Fe I/H] = -1.61 dex and [Fe I/H] = -1.62 dex, and are AGB stars; the remaining variables have [Fe I/H] = -1.44, -1.48, and -1.50 dex, the first two being RGB stars while the last is an AGB star. On the other hand, stars that appear to be nonvariable have -1.56 ≤ [Fe I/H] ≤ -1.40. We conclude that variability somehow affects the spectroscopic determination of the iron content of giant stars in NGC 3201, increasing the iron spread of the cluster. If variability is not taken into account, this spread could be incorrectly interpreted as due to an intrinsic iron spread affecting the stars of the cluster.
Fil: Llancaqueo Albornoz, Álvaro. Universidad de Concepción; Chile
Fil: Sandro, Villanova. Universidad de Concepción; Chile
Fil: Cortés, C. C.. Universidad de Concepción; Chile. Universidad del Bio Bio; Chile
Fil: Ahumada, Javier. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba; Argentina
Fil: Parisi, Maria Celeste. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Astronomía Teórica y Experimental. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba. Instituto de Astronomía Teórica y Experimental; Argentina. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba; Argentina
description We present the analysis of 34 light curves in V and I of 17 giant stars in the globular cluster NGC 3201 to check if such stars are variable and if their variability has some kind of impact on the iron abundance as obtained from spectroscopic measurements. First, we computed the generalized Lomb-Scargle and phase dispersion minimization periodograms of the sample to check if the stars were variables. In this way, seven stars of the sample were found to be nonvariable, two stars are considered as possible variables, and eight stars were found to be variable, with periods ranging from 0.0881 ± 0.0001 to 0.5418 ± 0.0027 days. According to the literature, the variables have distinct values of [Fe I/H]: the three most metal-rich stars are in the red giant branch (RGB) stage, one has [Fe I/H] = -1.37 dex, while the other two have [Fe I/H] = -1.31 dex. The two most metal-poor variables have [Fe I/H] = -1.61 dex and [Fe I/H] = -1.62 dex, and are AGB stars; the remaining variables have [Fe I/H] = -1.44, -1.48, and -1.50 dex, the first two being RGB stars while the last is an AGB star. On the other hand, stars that appear to be nonvariable have -1.56 ≤ [Fe I/H] ≤ -1.40. We conclude that variability somehow affects the spectroscopic determination of the iron content of giant stars in NGC 3201, increasing the iron spread of the cluster. If variability is not taken into account, this spread could be incorrectly interpreted as due to an intrinsic iron spread affecting the stars of the cluster.
publishDate 2021
dc.date.none.fl_str_mv 2021-02
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/11336/173036
Llancaqueo Albornoz, Álvaro; Sandro, Villanova; Cortés, C. C.; Ahumada, Javier; Parisi, Maria Celeste; Variability in NGC 3201 giant stars and its impact on their spectroscopic [Fe/H] determination; IOP Publishing; Astronomical Journal; 161; 2; 2-2021; 76-90
0004-6256
1538-3881
CONICET Digital
CONICET
url http://hdl.handle.net/11336/173036
identifier_str_mv Llancaqueo Albornoz, Álvaro; Sandro, Villanova; Cortés, C. C.; Ahumada, Javier; Parisi, Maria Celeste; Variability in NGC 3201 giant stars and its impact on their spectroscopic [Fe/H] determination; IOP Publishing; Astronomical Journal; 161; 2; 2-2021; 76-90
0004-6256
1538-3881
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/10.3847/1538-3881/abcf2f
info:eu-repo/semantics/altIdentifier/doi/10.3847/1538-3881/abcf2f
info:eu-repo/semantics/altIdentifier/arxiv/https://arxiv.org/abs/2012.00520
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by/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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