Metal abundances of RR Lyrae variables in selected Galactic star fields. V. The Lick Astrographic fields at intermediate Galactic latitudes

Journal Article · Fri Feb 01 00:00:00 EST 1991 · Astrophysical Journal; (USA)

DOI:https://doi.org/10.1086/169650· OSTI ID:6138268

Suntzeff, N B; Kinman, T D; Kraft, R P ^[1]

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1. Observatorio Interamericano de Cerro Tololo, La Serena (Chile) Kitt Peak National Observatory, Tucson, AZ (USA) Lick Observatory, Santa Cruz, CA (USA)

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. 149 refs.

• OSTI ID: 6138268
• Journal Information: Astrophysical Journal; (USA), Vol. 367; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
GIANT STARS
CHEMICAL COMPOSITION
MILKY WAY
VARIABLE STARS
DISTANCE
ELEMENT ABUNDANCE
HYDROGEN
IRON
MORPHOLOGY
STAR CLUSTERS
ABUNDANCE
ELEMENTS
GALAXIES
METALS
NONMETALS
STARS
TRANSITION ELEMENTS
640102* - Astrophysics & Cosmology- Stars & Quasi-Stellar
Radio & X-Ray Sources
640105 - Astrophysics & Cosmology- Galaxies