Other
Scientific paper
Apr 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...370..559d&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 370, April 1, 1991, p. 559-566.
Other
28
Astronomical Photometry, Charge Coupled Devices, Stellar Evolution, Stellar Luminosity, Supergiant Stars, Color-Color Diagram, Color-Magnitude Diagram, Imaging Techniques
Scientific paper
B, V, and R CCD images have been obtained of a field in the northern disk of the nearby galaxy NGC 253, covering portions of both the inner and outer disk components. It is found that the color-magnitude diagrams of the inner and outer disk regions contain similar features - blue supergiants of spectral type A, F, and G fainter than V about 18.5, as well as a population of red superginats. The mean extinction in the inner disk appears to be higher than that in the outer disk. Comparison with evolutionary tracks indicates that most of the stars detected in the inner and outer disk regions have masses less than or equal to 40 solar, suggesting that extremely massive stars are either heavily reddened or entirely absent. The outer disk luminosity functions in all three bandpasses follow power laws, with exponents similar to those observed in other galaxies. The distance modulus of NGC 253 is less than or equal to 27.0.
Clark Charles
Davidge Tim J.
Le Fèvre Oliver
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