| Type |
Journal Article |
| Names |
A. Godínez-Martínez, A. M. Watson, L. D. Matthews, L. S. Sparke |
| Publication |
Revista Mexicana de Astronomia y Astrofisica |
| Volume |
43 |
| Pages |
315-327 |
| Date |
October 1, 2007 |
| URL |
http://adsabs.harvard.edu/abs/2007RMxAA..43..315G |
| Library Catalog |
NASA ADS |
| Abstract |
We have obtained photometry in B and R for seven confirmed or probable
polar-ring galaxies from the Polar-Ring Catalog of Whitmore et al.
(1990). The rings show a range of colors from B - R ≈ 0.6 to B - R
≈ 1.7. The bluest rings have bright H II regions, which are direct
evidence for recent star formation. The minimum age of the reddest ring,
that in PRC B-20, is somewhat uncertain because of a lack of knowledge
of the internal reddening and metallicity, but appears to be at least
1.2 Gyr. As such, this ring is likely to be stable for at least several
rotation periods. This ring is an excellent candidate for future studies
that might better determine if it is truly old. |
| Tags |
GALAXIES: STELLAR CONTENT, Galaxies: Halos, Galaxies: Photometry |