Faculty Publications

Title

Fourier coefficients of OGLE variables. II. RR lyraes

Document Type

Article

Keywords

Stars: fundamental parameters, Stars: oscillations

Journal/Book/Conference Title

Acta Astronomica

Volume

48

Issue

2

First Page

341

Last Page

353

Abstract

Fourier coefficients for RR Lyraes in the OGLE survey are compared to the coefficients of field and cluster RR Lyraes. Based upon the location of the Bailey type ab and c stars for a range of metallicity, it appears that the vast majority of the OGLE variables have a [Fe/H] near -1.1. Using both empirical and theoretical relations for the Fourier coefficients, stellar characteristics are found to be similar to those derived in other RR Lyrae studies. There are also some stars in the OGLE sample which appear to be of a slightly different metal abundance, as well as some which are members of the Sagittarius dwarf galaxy. These latter stars do show a slight metal deficiency relative to most of the OGLE stars. The OGLE variables give a distance to the Galactic bulge of approximately 8 kpc, and a distance to the Sagittarius dwarf galaxy of about 25 kpc.

Original Publication Date

12-1-1998

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