Statistics – Computation
Scientific paper
Mar 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988aj.....95..704c&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 95, March 1988, p. 704-719, 953, 954.
Statistics
Computation
68
Carbon Stars, Magellanic Clouds, Star Clusters, Stellar Color, Stellar Mass, Stellar Spectrophotometry, Computational Astrophysics, Galactic Evolution, Globular Clusters, Spiral Galaxies
Scientific paper
CCD images of candidate star clusters in M33 were obtained for 13 fields in the B, V, and I bandpasses. The integrated visual colors and magnitudes are used to study the clusters, and evidence for extended giant branches and possibly carbon stars in several of the intermediate-aged clusters is presented. The colors, magnitudes, and positions are used to analyze stellar population of M33 and confirm the existence of massive star clusters with a 0.1-10-Gyr age range. That is, the cluster system of M33 shares some similarities to that of the Magellanic Clouds in that relatively 'massive' clusters are found at all ages. In addition, more than 20 true (i.e., old, massive) globulars are identified. A substantial population of intermediate-color clusters are found, and it is argued that the cluster-formation rate for clusters less than 10 Gyr old may be more continuous in M33 than in the Magellanic Clouds. The chemical evolution of M33 as traced by the clusters suggests that an abundance gradient existed at all ages, in that the 'outer' regions of the disk (i.e., R greater than 10 arcmin or 2 kpc) follow a slow enhancement history similar to the SMC, while the inner regions were enriched more dramatically.
Christian Carol A.
Schommer Robert A.
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