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Date and Time of the Query: 2019-08-24 T05:13:09 PDT
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For refcode 1992ApJ...397..457D:
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Copyright by American Astronomical Society. Reproduced by permission
1992ApJ...397..457D THE DISTRIBUTION AND AGE OF ASYMPTOTIC GIANT BRANCH STARS IN NGC 205 T. J. DAVIDGE Canada-France-Hawaii Telescope Corporation, P.O. Box 1597, Kamuela, HI 96743 Received 1992 January 27; accepted 1992 April 13 ABSTRACT V and I CCD images are used to investigate the spatial distribution and age of bright asymptotic giant branch (AGB) stars in the central regions of the Local Group dwarf elliptical galaxy NGC 205. These data reveal a large intermediate-age component, which is uniformly distributed over the central regions of the galaxy. The redward extent of the bright AGB sequence on the (I, V - I) diagram suggests that the majority of these objects have metallicities which are roughly solar. The most luminous AGB stars occur near M_bol_~- 5.5, while the density of AGB stars within 1' of the galaxy center, measured as a function of surface brightness, is constant. Moreover the bolometric luminosity function of AGB stars does not show spatial variations and is different from that seen in dwarf irregular galaxies, where stars with M_bol_ < -6 are detected. The data suggest that star formation has not been continuous in NGC 205, and it appears that the size of the most recent burst of star formation, of which the central concentration of early-type stars is the most conspicuous signature, was relatively minor compared with what occurred 0.5-1 Gyr in the past. It is speculated that the appearance of NGC 205 during intermediate epochs may have been similar to the gas-rich dwarf galaxy NGC 3077, a member of the M81 group which is currently experiencing a large burst of star formation. Subject headings: galaxies: elliptical and lenticular, CD - galaxies: evolution - galaxies: individual (NGC 205)- galaxies: stellar content
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