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Title:
Metallicity of Galactic Bulge RR Lyrae
Authors:
Kunder, A. M.; Chaboyer, B.; Popowski, P.; Nikolaev, S.; Cook, K.
Affiliation:
AA(Dartmouth College), AB(Dartmouth College), AC(Max-Planck Institute fuer Astrophysik), AD(Lawrence Livermore National Laboratory), AE(Lawrence Livermore National Laboratory)
Publication:
American Astronomical Society Meeting 205, #54.02; Bulletin of the American Astronomical Society, Vol. 36, p.1427
Publication Date:
12/2004
Origin:
AAS
Bibliographic Code:
2004AAS...205.5402K

Abstract

Metallicities of approximately 3500 RR Lyrae stars towards the Galactic bulge from the MACHO Survey bulge fields are presented. These metallicities are based upon a empirically calibrated relationship between the Fourier decomposition of the light curve and [Fe/H]. We find the RRab stars from the MACHO bulge fields associated with Sagittarius dwarf galaxy have a lower average metallicity than the RRab Lyrae stars associated with the Galactic bulge. We investigate the dispersion of the metallicity in the bulge RRab Lyrae stars and the correlation between metallicity and the location of the stars within the bulge.
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