WFPC2 Observations of Massive and Compact Young Star Clusters in M31

Details WFPC2 Observations of Massive and Compact Young Star Clusters in M31 WFPC2 Observations of Massive and Compact Young Star Clusters in M31

2000-10-09

arxiv.org/abs/astro-ph/0010168v1

Astronomy and Astrophysics

Astrophysics

17 pages, Latex, ApJ, in Press

Scientific paper

10.1086/318679

We present color magnitude diagrams of four blue massive and compact star clusters in M31: G38, G44, G94, and G293. The diagrams of the four clusters reveal a well-populated upper main sequence and various numbers of supergiants. The U-B and B-V colors of the upper main sequence stars are used to determine reddening estimates of the different lines of sight in the M31 disk. Reddening values range from E(B-V) = 0.20 +/- 0.10 to 0.31 +/- 0.11. We statistically remove field stars on the basis of completeness, magnitude and color. Isochrone fits to the field-subtracted, reddening-corrected diagrams yield age estimates ranging from 63 +/- 15 Myr to 160 +/- 60 Myr. Implications for the recent evolution of the disk near NGC 206 are discussed.

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