Early-Type Stars

Details Early-Type Stars Early-Type Stars

Sep 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999ap%26ss.267..129f&link_type=abstract

Astrophysics and Space Science, v. 267, Issue 1/4, p. 129-138 (1999).

Astronomy and Astrophysics

Astrophysics

Scientific paper

Away from the young disk, several classes of early type stars are found. They include (i) the old, metal-poor blue horizontal branch stars of the halo and the metal-poor tail of the thick disk; (ii) metal-rich young A stars in a rapidly rotating subsystem but with a much higher velocity dispersion than the A stars of the young disk, and (iii) a newly discovered class of metal-poor young main sequence A stars in a subsystem of intermediate galactic rotation (Vrot ≈ 120 km s-1). The existence and kinematics of these various classes of early type stars provide insight into the formation of the metal-poor stellar halo of the Galaxy and into the continuing accretion events suffered by our Galaxy.

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