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Characteristics and Space Distribution of Stars in the Bulge of the Milky Way

Published online by Cambridge University Press:  23 September 2016

Jay A. Frogel
Jay A. Frogel*
Affiliation:
Kitt Peak National Observatory, National Optical Astronomy Observatories, P. O. Box 26732, Tucson, AZ 85726

Abstract

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Stars in Baade's Window at b = −4° are described. They are old, metal rich, and have a velocity dispersion greater than 100 km/sec. Their colors are unlike those of any other group of stars. Stars in other windows between b = −3 and −12° differ systematically from those in Baade's Window. The differences are best understood if they are caused by a metallicity gradient in the bulge. The distribution of surface brightness or surface density over the bulge has a much steeper falloff than that seen in other galaxies or in the very center of the Milky Way itself. It is now possible to link together stars in the immediate vicinity of the nucleus with those that are several hundred parsecs out. Understanding this linkage will help in understanding the history and evolution of stars throughout the bulge and that part of the inner disk with which it overlaps.

Type
The Galactic Bulge
Information
Symposium - International Astronomical Union , Volume 136: The Galactic Center , 1989 , pp. 55 - 62
Copyright
Copyright © Kluwer 1989 

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