Metal abundances of RR Lyrae variables in selected galactic star fields. III - The Lick astrographic fields near the galactic anticenter

Details Metal abundances of RR Lyrae variables in selected galactic star fields. III - The Lick astrographic fields near the galactic anticenter Metal abundances of RR Lyrae variables in selected galactic star fields. III - The Lick astrographic fields near the galactic anticenter

Feb 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982aj.....87..353b&link_type=abstract

Astronomical Journal, vol. 87, Feb. 1982, p. 353-359.

Astronomy and Astrophysics

Astronomy

34

Abundance, Astronomical Photography, Cepheid Variables, Metallic Stars, Star Distribution, Stellar Models, Chemical Composition, Galactic Nuclei, Globular Clusters, Image Tubes, Light Curve

Scientific paper

Values of the Preston metal-abundance index As and corresponding metallicities [Fe/H] are derived for 26 of the 28 stars classified as RR Lyraes that have been discovered in three anticenter intermediate-latitude fields of the Lick astrograph survey. The mean metallicity and metallicity spread of these stars are essentially identical with those derived earlier from a somewhat larger sample of RR Lyraes in the north galactic pole. In both the anticenter and polar regions, the stars extend to galactocentric distances of 25 kpc or more. The entire sample of 61 RR Lyraes shows no direct evidence for an abundance gradient and the extremes o metallicity at any given [Fe/H] range over about 1 dex. Problems in deducing the true halo abundance gradient from RR Lyraes are discussed.

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