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Early-Type Stars

Published online by Cambridge University Press:  07 August 2017

K.C. Freeman
K.C. Freeman*
Affiliation:
Mount Stromlo and Siding Spring Observatories, The Australian National University, Canberra, AUSTRALIA (kcf@merlin.anu.edu.au)

Abstract

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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.

Type
Session 3: Open Clusters and the Galactic Disk
Information
Symposium - International Astronomical Union , Volume 164: Stellar Populations , 1995 , pp. 119 - 127
Copyright
Copyright © Kluwer 1995 

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