| Title | Stellar Content of Nearby Galaxies. III. The Local Group Spiral Galaxy M33 |
| Authors | Wilson, Christine D.; Freedman, Wendy L.; Madore, Barry F. |
| Bibcode | 1990AJ.....99..149W Search ADS ↗ |
| Abstract | BVRI CCD photometry is presented for stars brighter than V = 21 mag in four fields in the nearby spiral galaxy M33. V vs (B-V) and I vs (V-S) color- magnitude diagrams clearly show both a young stellar population (as indicated by the blue main sequence and red supergiant plumes) as well as an intermediate-age population of asymptotic giant branch stars. Deep photometry in the outer field (where crowding is less severe) reveals a population consistent in color and magnitude with the tip of the first red giant branch. The M33 distance modulus, 24.6 +/- 0.3 mag, derived from this Population II component is consistent with a recent redetermination of the distance modulus found from Population I Cepheid variables. Finally, some evidence is presented for a radial gradient in the average internal reddening for the fields in M33 reported here. |
| Objects | 1 Objects Search NED ↙ |
