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Metal abundances of RR Lyrae variables in selected Galactic star fields. V - The Lick Astrographic fields at intermediate Galactic latitudes
Suntzeff, Nicholas B.; Kinman, T. D.; Kraft, Robert P.
AA(Observatorio Interamericano de Cerro Tololo, La Serena, Chile), AB(Kitt Peak National Observatory, Tucson, AZ), AC(Lick Observatory, Santa Cruz, CA)
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 367, Feb. 1, 1991, p. 528-546. (ApJ Homepage)
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NASA/STI Keywords:
Abundance, Blue Stars, Cepheid Variables, Giant Stars, Metallicity, Milky Way Galaxy, Galactic Structure, Globular Clusters, H Lines, Halos, Star Distribution
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Metal abundances are derived for 60 newly discovered RR Lyraes in three Lick Astrographic Survey fields at three Galactic altitudes (l,b): (86 deg, +35 deg), (52 deg, +35 deg), and (18 deg, +25 deg). In addition, Delta S values were obtained for five nearby field RR Lyraes which have no previous records, and improved Delta S values were obtained for 24 nearby RR Lyraes. These values, in conjunction with data from previous Lick surveys and those obtained by Saha and Oke (1985), were used to study the nature of the Galactic halo in the galactocentric distance range 4-30 kpc, based on 171 Lyraes. It was found that the Galactic halo undergoes a change in the behavior of the Fe/H ratio at the position of the solar circle.

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