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dc.contributor.author
Llancaqueo Albornoz, Álvaro
dc.contributor.author
Sandro, Villanova
dc.contributor.author
Cortés, C. C.
dc.contributor.author
Ahumada, Javier
dc.contributor.author
Parisi, Maria Celeste
dc.date.available
2022-10-13T15:39:44Z
dc.date.issued
2021-02
dc.identifier.citation
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
dc.identifier.issn
0004-6256
dc.identifier.uri
http://hdl.handle.net/11336/173036
dc.description.abstract
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.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
IOP Publishing
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by/2.5/ar/
dc.subject
Globular star clusters
dc.subject
Stellar abundances
dc.subject
Solar and Stellar Astrophysics
dc.subject.classification
Astronomía
dc.subject.classification
Ciencias Físicas
dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
dc.title
Variability in NGC 3201 giant stars and its impact on their spectroscopic [Fe/H] determination
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2022-09-21T13:53:41Z
dc.identifier.eissn
1538-3881
dc.journal.volume
161
dc.journal.number
2
dc.journal.pagination
76-90
dc.journal.pais
Reino Unido
dc.journal.ciudad
Londres
dc.description.fil
Fil: Llancaqueo Albornoz, Álvaro. Universidad de Concepción; Chile
dc.description.fil
Fil: Sandro, Villanova. Universidad de Concepción; Chile
dc.description.fil
Fil: Cortés, C. C.. Universidad de Concepción; Chile. Universidad del Bio Bio; Chile
dc.description.fil
Fil: Ahumada, Javier. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba; Argentina
dc.description.fil
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
dc.journal.title
Astronomical Journal
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://iopscience.iop.org/article/10.3847/1538-3881/abcf2f
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/https://doi.org/10.3847/1538-3881/abcf2f
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/arxiv/https://arxiv.org/abs/2012.00520
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