Metallicities of RR Lyrae stars in Omega Cen Virtual Observatory Resource

Authors

1. Sollima A.
2. Borissova J.
3. Catelan M.
4. Smith H.A.
5. Minniti D.
6. Cacciari C.,Ferraro F.R.

Published by

CDS

Abstract

We present new spectroscopic metal abundances for 74 RR Lyrae (RRL) stars in {omega} Cen obtained with FLAMES. The well-known metallicity spread is visible among the RRL variables. The metal-intermediate (MI) RRL stars ([Fe/H]~-1.2) are fainter than the bulk of the dominant metal-poor population ([Fe/H]~-1.7), in good agreement with the corresponding zero-age horizontal-branch models with cosmological helium abundance Y=0.246.

Keywords

1. globular-star-clusters
2. variable-stars
3. metallicity

Bibliographic source Bibcode

2006ApJ...640L..43S

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ivo://CDS.VizieR/J/ApJ/640/L43

Document Object Identifer DOI

doi:10.26093/cds/vizier.16409043

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