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For refcode 1996AJ....112.1438L:
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Copyright by American Astronomical Society. Reproduced by permission
1996AJ....112.1438L STELLAR POPULATIONS IN THE CENTRAL REGION OF THE DWARF ELLIPTICAL GALAXY NGC 205 MYUNG GYOON LEE Department of Astronomy, Seoul National University, Seoul 151-742, Korea Electronic mail: mglee@astrog.snu.ac.kr Received 1996 May 14; revised 1996 July 1 ABSTRACT BVRI CCD photometry of ~2,300 stars in the central 2.2" x 3.5" area of the dwarf elliptical galaxy NGC 205 in the Local Group is presented. The color-magnitude diagrams of NGC 205 show: (1) a blue plume around (B- V) ~ 0.0 mag, extending up to V ~ 19.3 mag (M_v_ ~-5.4 mag); and (2) a strong asymptotic giant branch (AGB) population, the brightest of which reaches I ~ 19.0 mag, 1.5 mag brighter than the tip of the red giant branch. BVRI photometry of three globular clusters (Hubble IV, V, and VI) is also presented. Hubble V is much bluer [(B - V) = 0.37] than other globular clusters. This blue color of Hubble V leads to an estimate of the age, ~300 Myrs. A V luminosity function for the blue stars has been derived: the logarithmic slope of the luminosity function for - 5.7 <M_v_ < -3.2 is 0.64+/-0.12, which is similar to those of other nearby galaxies. The AGB stars extend to M_bol_ = -5.7 mag, which is ~0.7 mag brighter than those in NGC 185. The bolometric luminosity function of the AGB stars in NGC 205 is found to be flatter than that of the similar dwarf elliptical galaxy NGC 185, but similar to that of a bulge field 4' of the nucleus of M31. Surface photometry for the central area within R = 50" is presented, showing that the colors get bluer as the galactocentric radius decreases except for the nucleus region within R= 1.6" where the colors get redder inward. Star formation history in NGC 205 is briefly discussed.
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