RR Lyrae stars and the distant Galactic halo - Distribution, chemical composition, kinematics, and dynamics

descriptionPublicationkeyboard_double_arrow_right Article 01 Feb 1985 English Publisher:American Astronomical SocietyJournal:The Astrophysical Journal, volume 289, page 310 (issn: 0004-637X, eissn: 1538-4357,

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Authors: A. Saha;

doi: 10.1086/162890

RR Lyrae stars and the distant Galactic halo - Distribution, chemical composition, kinematics, and dynamics

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Abstract

Published observational data on 29 outer-Galactic-halo RR Lyr stars (Saha, 1984, and Saha and Oke, 1984) and from other surveys are analyzed to characterize the mass distribution, chemical composition, kinematics, and dynamics of the outer Galaxy (up to galactocentric radius R = 40 kpc). The results are presented in graphs and tables and discussed. Findings reported include a rapid fall-off of RR Lyr density at R = 25 kpc, Fe/H varying from -1.0 to -2.2 (with two stars at -0.5), no net Fe/H gradient in the far halo, and Galactic mass (from dynamical computations) about 3 x 10 to the 11th solar mass within R = 25 kpc.

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