Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...354..428b&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 354, May 10, 1990, p. 428-437.
Astronomy and Astrophysics
Astrophysics
14
Astronomical Photometry, Galactic Evolution, Galactic Structure, Ring Galaxies, Interacting Galaxies, Luminosity, Spiral Galaxies
Scientific paper
CCD surface photometry of the southern ringed S0(+) galaxy NGC 7187, a particularly good example of a system with two bright clear rings with significantly different apparent shapes and almost no sign of a bar, is presented. The galaxy has below average luminosity and the rings are small compared to those observed in more typical (R)SB(r) type galaxies, even though the ratio of their sizes is similar to those in such galaxies. Bulge isophotes reveal the existence of two nearly orthogonal ovals, one having the same shape and position angle as isophotes of the outer disk. The central oval shows significant m = 4 deviations from elliptical isophote shapes and could be a nuclear bar. The rings are slightly blue enhancements compared to their surroundings. The mean colors of both rings do not imply exceptionally high star formation at the present time.
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