Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985afz....22...25m&link_type=abstract
(Astrofizika, vol. 22, Jan.-Feb. 1985, p. 25-30) Astrophysics (ISSN 0571-7132), vol. 21, no. 1, July 1985, p. 13-16. Translation
Astronomy and Astrophysics
Astronomy
1
Color, Galactic Nuclei, Galactic Structure, Spiral Galaxies, Ubv Spectra, Ultraviolet Astronomy, Astronomical Catalogs, Barred Galaxies, Irregular Galaxies
Scientific paper
Galaxies of the Biurakan classes 2 and 5, which belong to the morphological subtypes Sa, Sab, Sb, and Sbc (including the SB galaxies), are shown to be on the average somewhat bluer than the galaxies of classes 3 and 4 of these same subtypes. Among galaxies of the classes 2, 5, and 2s, objects with excess ultraviolet radiation are found rather more frequently than among galaxies of classes 3 and 4. Whereas Sa, Sab, Sb, and Sbc galaxies of classes 3 and 4 scarcely differ from one another in their mean B-V and U-B, Sc and Scd galaxies of class 4 (and also classes 2 and 5) are on average bluer than class 3. In comparison with the latter, among Sc and Scd galaxies of classes 2, 4, and 5, there are rather more objects with negative U-B. These facts, together with the already known indicators of activity in galaxies of the classes 2, 4, 5, and 2s, in their turn point to active processes taking place in galaxies with diffuse, split, semistellar, or starlike nuclei.
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