BD - 6 deg 855 - A mildly metal-deficient dwarf from the outer halo

Details BD - 6 deg 855 - A mildly metal-deficient dwarf from the outer halo BD - 6 deg 855 - A mildly metal-deficient dwarf from the outer halo

Nov 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...298..803c&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 298, Nov. 15, 1985, p. 803-807.

Astronomy and Astrophysics

Astrophysics

11

Dwarf Stars, G Stars, Stellar Composition, Stellar Motions, Astronomical Photometry, Interstellar Extinction, Metallicity, Radial Velocity, Stellar Systems, Stellar Temperature

Scientific paper

Photometric and spectroscopic data are presented for BD - 6 deg 855, a high-proper motion, high-radial velocity G dwarf. Its kinematics are extreme: U of about +370, V of about -195, and W of about +80 km/sec. An abundance analysis reveals that its metallicity is not very low, only Fe/H = 0.70, 0.7 dex more metal-rich than any outer halo stellar system or comparable-velocity star. Its Na/Fe abundance ratio suggests it is a true halo star rather than a disk star, although its Si/Fe ratio may be anomalous. The outer Galactic halo is inferred to contain stars with a wide range in abundances, as envisioned in the fragmentary and prolonged halo formation model of Searle and Zinn (1978).

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