Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983aj.....88..939d&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 88, July 1983, p. 939-961.
Astronomy and Astrophysics
Astronomy
68
Astrometry, Galactic Clusters, Galaxies, Interstellar Extinction, Milky Way Galaxy, Brightness, Coefficients, Color, Distance, Luminosity
Scientific paper
Data on galaxies are used to determine the effects of galactic extinction on extragalactic objects. Counts of faint galaxies and of galactic clusters are used to establish the presence of extinction in the polar caps and the statistical validity of the csc b law right up to the poles. The mean surface brightness of bright galaxies and the hydrogen index, measuring the neutral hydrogen to luminosity ratio, are used to evaluate the total B-band extinction coefficient. The color excesses of bright galaxies in B-V and U-B are applied to evaluate the reddening coefficient which provides a third, independent estimate of the polar extinction. It is shown that all these indicators are in much better agreement with the extinction model proposed by de Vaucouleurs, de Vaucouleurs, and Corwin (1976) than with the one proposed by McClure and Crawford (1971).
Buta Ron
de Vaucouleurs Gerard
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