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dc.contributor.author
de Castro, D.B.  
dc.contributor.author
Pereira, C. B.  
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Roig, F.  
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Jilinski, E.  
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Drake, N. A.  
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Chavero, Carolina Andrea  
dc.contributor.author
Sales Silva, J. V.  
dc.date.available
2022-11-30T16:05:33Z  
dc.date.issued
2016-03  
dc.identifier.citation
de Castro, D.B.; Pereira, C. B.; Roig, F.; Jilinski, E.; Drake, N. A.; et al.; Chemical abundances and kinematics of barium stars; Oxford University Press; Monthly Notices of the Royal Astronomical Society; 459; 4; 3-2016; 4299-4324  
dc.identifier.issn
0035-8711  
dc.identifier.uri
http://hdl.handle.net/11336/179569  
dc.description.abstract
In this paper, we present an homogeneous analysis of photospheric abundances based on high-resolution spectroscopy of a sample of 182 barium stars and candidates. We determined atmospheric parameters, spectroscopic distances, stellar masses, ages, luminosities and scaleheight, radial velocities, abundances of the Na, Al, α-elements, iron-peak elements, and s-process elements Y, Zr, La, Ce, and Nd. We employed the local thermodynamic equilibrium model atmospheres of Kurucz and the spectral analysis code moog. We found that the metallicities, the temperatures and the surface gravities for barium stars cannot be represented by a single Gaussian distribution. The abundances of α-elements and iron peak elements are similar to those of field giants with the same metallicity. Sodium presents some degree of enrichment in more evolved stars that could be attributed to the NeNa cycle. As expected, the barium stars show overabundance of the elements created by the s-process. By measuring the mean heavy-element abundance pattern as given by the ratio [s/Fe], we found that the barium stars present several degrees of enrichment. We also obtained the [hs/ls] ratio by measuring the photospheric abundances of the Ba-peak and the Zr-peak elements. Our results indicated that the [s/Fe] and the [hs/ls] ratios are strongly anticorrelated with the metallicity. Our kinematical analysis showed that 90 per cent of the barium stars belong to the thin disc population. Based on their luminosities, none of the barium stars are luminous enough to be an asymptotic giant branch star, nor to become self-enriched in the s-process elements. Finally, we determined that the barium stars also follow an age-metallicity relation.  
dc.format
application/pdf  
dc.language.iso
eng  
dc.publisher
Oxford University Press  
dc.rights
info:eu-repo/semantics/openAccess  
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/  
dc.subject
ABUNDANCES  
dc.subject
BINARIES: GENERAL  
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NUCLEAR REACTIONS  
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NUCLEOSYNTHESIS  
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STARS: ABUNDANCES  
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STARS: AGB AND POST-AGB  
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STARS: CHEMICALLY PECULIAR  
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STARS: EVOLUTION  
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STARS: FUNDAMENTAL PARAMETERS  
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Astronomía  
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Ciencias Físicas  
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CIENCIAS NATURALES Y EXACTAS  
dc.title
Chemical abundances and kinematics of barium stars  
dc.type
info:eu-repo/semantics/article  
dc.type
info:ar-repo/semantics/artículo  
dc.type
info:eu-repo/semantics/publishedVersion  
dc.date.updated
2022-11-30T12:08:16Z  
dc.journal.volume
459  
dc.journal.number
4  
dc.journal.pagination
4299-4324  
dc.journal.pais
Reino Unido  
dc.journal.ciudad
Londres  
dc.description.fil
Fil: de Castro, D.B.. Ministério de Ciencia, Tecnologia e Innovacao. Observatorio Nacional; Brasil  
dc.description.fil
Fil: Pereira, C. B.. Ministério de Ciencia, Tecnologia e Innovacao. Observatorio Nacional; Brasil  
dc.description.fil
Fil: Roig, F.. Ministério de Ciencia, Tecnologia e Innovacao. Observatorio Nacional; Brasil  
dc.description.fil
Fil: Jilinski, E.. Ministério de Ciencia, Tecnologia e Innovacao. Observatorio Nacional; Brasil  
dc.description.fil
Fil: Drake, N. A.. Ministério de Ciencia, Tecnologia e Innovacao. Observatorio Nacional; Brasil  
dc.description.fil
Fil: Chavero, Carolina Andrea. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba; Argentina  
dc.description.fil
Fil: Sales Silva, J. V.. Ministério de Ciencia, Tecnologia e Innovacao. Observatorio Nacional; Brasil  
dc.journal.title
Monthly Notices of the Royal Astronomical Society  
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1093/mnras/stw815