Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990aj.....99..149w&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 99, Jan. 1990, p. 149-177. Research supported by NASA IRAS Extended Mission Program.
Astronomy and Astrophysics
Astronomy
42
Astronomical Photometry, Charge Coupled Devices, Color-Magnitude Diagram, Early Stars, Spiral Galaxies, Asymptotic Giant Branch Stars, Blue Stars, Main Sequence Stars, Red Giant Stars
Scientific paper
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 - I) 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 + or - 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.
Freedman Wendy L.
Madore Barry F.
Wilson Christine Diana
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