Abundances in Milky Way's disk Virtual Observatory Resource

Authors
  1. Soubiran C.
  2. Girard P.
  3. Published by
    CDS
Abstract

We have compiled a large catalogue of metallicities and abundance ratios from the literature in order to investigate abundance trends of several alpha and iron peak elements in the thin disk and the thick disk of the Galaxy. The catalogue includes 743 stars with abundances of Fe, O, Mg, Ca, Ti, Si, Na, Ni and Al in the metallicity range -1.30<[Fe/H]<+0.50. We have checked that systematic differences between abundances measured in the different studies were lower than random errors before combining them. Accurate distances and proper motions from Hipparcos, and radial velocities from several sources have been retrieved for 639 stars and their velocities (U,V,W) and galactic orbits have been computed. Ages of 322 stars have been estimated with the Bayesian method of isochrone fitting developed by Pont & Eyer (2004MNRAS.351..487P). Two samples kinematically representative of the thin and thick disks have been selected, taking into account the Hercules stream which is intermediate in kinematics, but with a probable dynamical origin. Our results show that the two disks are chemically well separated, they overlap greatly in metallicity and both show parallel decreasing trends of alpha elements with increasing metallicity, in the interval -0.80<[Fe/H]<-0.30. The Mg enhancement with respect to Fe of the thick disk is measured to be 0.14dex. An even larger enhancement is observed for Al. The thick disk is clearly older than the thin disk with a tentative evidence of an AMR over 2-3Gyr and a hiatus in star formation before the formation of the thin disk. We do not observe a vertical gradient in the metallicity of the thick disk. The Hercules stream have properties similar to that of the thin disk, with a wider range of metallicity. Metal-rich stars assigned to the thick disk and super metal rich stars assigned to the thin disk appear as outliers in all their properties.

Keywords
  1. chemically-peculiar-stars
Bibliographic source Bibcode
2005A&A...438..139S
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/438/139
IVOA Identifier IVOID
ivo://CDS.VizieR/J/A+A/438/139
Document Object Identifer DOI
doi:10.26093/cds/vizier.34380139

Access

Web browser access HTML
https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/438/139
https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/438/139
http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/438/139
IVOA Table Access TAP
https://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).
https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/438/139/catalog?
https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/438/139/catalog?
http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/438/139/catalog?

History

2005-08-12T06:29:33Z
Resource record created
2005-08-12T06:29:33Z
Created
2018-01-05T08:56:51Z
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