Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...367..528s&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 367, Feb. 1, 1991, p. 528-546.
Astronomy and Astrophysics
Astrophysics
174
Abundance, Blue Stars, Cepheid Variables, Giant Stars, Metallicity, Milky Way Galaxy, Galactic Structure, Globular Clusters, H Lines, Halos, Star Distribution
Scientific paper
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.
Kinman Thomas D.
Kraft Robert P.
Suntzeff Nicholas B.
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