Photoelectric color measurements of outer rings in galaxies

Details Photoelectric color measurements of outer rings in galaxies Photoelectric color measurements of outer rings in galaxies

Oct 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...241..567g&link_type=abstract

Astrophysical Journal, Part 1, vol. 241, Oct. 15, 1980, p. 567-572.

Astronomy and Astrophysics

Astrophysics

11

Astronomical Photometry, Electrophotometry, Galactic Structure, Ring Structures, Ubv Spectra, Colorimetry, Spiral Galaxies, Star Distribution

Scientific paper

Beam-switched photoelectric measurements of UBV colors have been obtained for faint outer rings in four representative galaxies. The data show that rings exist over a range of colors and that the most common rings, which are found in RSB0/a galaxies like NGC 2859, consist largely of older stars. The surface brightness increase within such rings is therefore most plausibly attributed to an increase in the projected stellar density associated with the nonaxisymmetric structure of barred and oval galaxies. The outer ring in the oval galaxy NGC 4736 has a relatively blue B-V color, and this provides an example of an outer ring in which young stars are important. A brief discussion of possible formation mechanisms for outer rings is presented.

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