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PHOTOMETRIC EVOLUTION OF GALAXIES: STAR FORMATION RATE AND HUBBLE SEQUENCE
Ann, Hong-Bae,Lee, Chang-Won,Lee, See-Woo The Korean Astronomical Society 1991 Journal of The Korean Astronomical Society Vol.24 No.1
We construct a simple photometric evolution model of galaxies based on the evolutionary population synthesis. In our models an exponentially decreasing SFR with a power law IMF is used to compute the UBV colors of galaxies from ellipticals to late type spirals. It is shown that the integrated colors of galaxies with different Hubble type can be explained by one parameter, SFR.
BULGES OF TWO BARRED GALAXIES: NGC 3412 AND NGC 3941
ANN HONG BAE,HWANG INOK The Korean Astronomical Society 1999 Journal of The Korean Astronomical Society Vol.32 No.1
We have conducted near-infrared (J- and H-band) surface photometry for two early type barred galaxies, NGC 3412 and NGC 3941. The bulges of NGC 3412 and NGC 3941 show isophotal twists which indicate that they are triaxial. NGC 3412 has a very short bar and its bulge is more centrally concentrated than that of NGC 3941. The unusually short bar and the centrally concentrated triaxial bulge of NGC 3412 might be the result of bar dissolution. The colors of the nuclear region of NGC 3941 resemble those of the blue nuclei, implying the presence of young stellar populations.