Computer Science
Scientific paper
May 1935
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1935harci.404....1w&link_type=abstract
Harvard College Observatory Circular, v. 404, p. 1-21
Computer Science
6
Scientific paper
The present investigation was undertaken in order to determine the colors of the brighter Virgo-Coma galaxies. The methods of observationn and reduction differ somewhat from those in current use and depend only on laboratory calibration of the photographic plates plus a knowledge of stellar spectral types in the sky regions studied. The methods and results are presented in Section 1.
Earlier work has indicated that the external galaxies are redder than average stars of the corresponding spectral types, a result which this investigation confirms. To show that the apparent difference arises normally in a composite spectrum originating from a stellar group of mixed spectral types, a calculation is made in Sections 6-11 of the effective color index and spectral type of a galactic cross section near the sun, as viewed from a distance. A synthetic galaxy is then shown to reproduce the observed spectral characteristics and color indices of average external galaxies. A method for the analysis of composite spectra is briefly outlined.
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