Distribution and studies of the infrared stellar population in the Galaxy. III - Baade's window photometry

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Infrared Stars, Milky Way Galaxy, Star Distribution, Stellar Spectrophotometry, Calibrating, Galactic Bulge, Open Clusters, Stellar Magnitude, Telescopes

Scientific paper

An IR-scan of a 201 sq arcmin area of Baade window (l about 0.0, b about -4 deg) is acquired down to K = plus 11.0. The stellar distribution is separated into possible disk plus bulge components with the assistance of a theoretical exponential disk simulation program. The difference in slope at bright magnitudes K less than plus 9.0 between the cumulative K-counts function of the bulge and the disk implies the presence of two radically different stellar populations within a radius of +/- 3 kpc from the Galactic center. It is suggested that one population is formed by younger, more metal-rich stars that are occupants of the disk, while the other consists of older, metal-deficient stars.

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