Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apjs...58..463n&link_type=abstract
Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 58, July 1985, p. 463-492.
Astronomy and Astrophysics
Astrophysics
177
Metallicity, Milky Way Galaxy, Star Distribution, Stellar Composition, Stellar Motions, Stellar Spectrophotometry, Dwarf Stars, Eccentricity, Galactic Evolution, Giant Stars, Globular Clusters, Horizontal Branch Stars, Radial Velocity, Stellar Orbits
Scientific paper
BVRI and DDO photometry together with kinematic data are presented for the spectroscopically chosen sample of Bidelman-MacConnell (BM) "weak-metal" stars. Analysis yields chemical abundances and space motions, which are compared with those of the kinematically selected sample of Eggen, Lynden-Bell, and Sandage (ELS). The BM sample appears to contain a significant proportion of low-abundance, low-eccentricity objects, in contrast to the results of ELS (≡ 20% of BM objects with [Fe/H] ≤ -1 have e ≤ 0.4). The velocity dispersion of such stars perpendicular to the galactic plane is 60±9 km s-1. Finally, for stars with [Fe/H] ≤ -1.2 the velocity ellipsoid is described by σu = 125±11, σv = 96±9, σw = 88±7 km s-1.
Bessell Michael S.
Norris Jackson
Pickles Andrew J.
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