Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979ap%26ss..60...15w&link_type=abstract
Astrophysics and Space Science, vol. 60, no. 1, Jan. 1979, p. 15-47.
Astronomy and Astrophysics
Astrophysics
59
Astronomical Catalogs, Astronomical Photometry, Galaxies, Ubv Spectra, Colorimetry, Galactic Nuclei, Galactic Structure, Southern Hemisphere, Stellar Evolution
Scientific paper
Multiaperture photometry of 262 bright southern galaxies in the Johnson UBV system is given. Most of these are south of -30 deg declination, although some northward to -10 deg are included. A total of 169 objects have published radial-velocity determinations. These provide distances and enable construction of color-magnitude diagrams for this subset of objects through a physical diameter of 2.0 kpc (with H = 100). The two-color diagrams for the inner regions of the galaxies differ from those of integrated galaxies due to the color changes towards their centers. Comparison with theoretical models of Larson and Tinsley (1978) suggest that the colors of the inner portions of most ellipticals and lenticulars are consistent with their having all stars formed at nearly one epoch with little subsequent star formation, while for spirals larger amounts of star formation, either in bursts or continuously, are suggested. This simple picture is complicated by the presence of certain objects having peculiar colors indicative of large amounts of recent star formation.
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