Barium stars abundances and kinematics Virtual Observatory Resource

Authors
  1. de Castro D.B
  2. Pereira C.B
  3. Roig F
  4. Jilinski E
  5. Drake N.A
  6. Chavero C.,Sales Silva J.V
  7. Published by
    CDS
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, {alpha}-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 {alpha}-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.

Keywords
  1. peculiar-variable-stars
  2. chemical-abundances
Bibliographic source Bibcode
2016MNRAS.459.4299D
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/459/4299
IVOA Identifier IVOID
ivo://CDS.VizieR/J/MNRAS/459/4299
Document Object Identifer DOI
doi:10.26093/cds/vizier.74594299

Access

Web browser access HTML
http://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/459/4299
https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/459/4299
http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/459/4299
IVOA Table Access TAP
http://tapvizier.cds.unistra.fr/TAPVizieR/tap
Run SQL-like queries with TAP-enabled clients (e.g., TOPCAT).
IVOA Cone Search SCS
For use with a cone search client (e.g., TOPCAT).
http://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/459/4299/sample?
https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/459/4299/sample?
http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/459/4299/sample?

History

2016-06-03T09:08:11Z
Resource record created
2016-06-03T09:08:11Z
Created
2024-08-16T20:16:59Z
Updated

Contact

Name
CDS support team
Postal Address
CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France
E-Mail
cds-question@unistra.fr