WFPC2 Observations of Massive and Compact Young Star Clusters in M31

Abstract

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.

17 pages, Latex, ApJ, in Press

References in corpus (3)

• M31 Globular Clusters: Colors and Metallicities
• The \mv vs \fe Calibration: I. HST Color-Magnitude Diagrams of 8 Globular Clusters in M 31
• Deep HST V- and I-Band Observations of Two Globular Clusters in the Halo of M31

Cited by in corpus (29)

• Extragalactic Globular Clusters and Galaxy Formation
• The Panchromatic Hubble Andromeda Treasury X. Ultraviolet to Infrared Photometry of 117 Million Equidistant Stars
• HI kinematics and dynamics of Messier 31
• Investigating the Andromeda Stream: I. Simple Analytic Bulge-Disk-Halo Model for M31
• Star Clusters in M31: I. A Catalog and a Study of the Young Clusters
• The Recent Star Formation History of the M31 Disk
• Massive young clusters in the disc of M31
• GALEX Ultraviolet Photometry of Globular Clusters in M31: Three Year Results and a Catalog
• Clues about the Star Formation History of the M31 Disk from WFPC2 Photometry
• Spectral energy distributions and age estimates of 104 M31 globular clusters
• Spectral Energy Distributions and Age Estimates of 39 Globular Clusters in M31
• An HST/WFPC2 Survey of Bright Young Clusters in M31 III. Structural Parameters
• An updated catalog of M31 globular-like clusters: UBVRI photometry, ages, and masses
• Compact Star Clusters in the M31 Disk
• To Be or Not To Be: Very Young Globular Clusters in M31
• HST/ACS colour-magnitude diagrams of M31 globular clusters
• Identification and Analysis of Young Star Cluster Candidates in M31
• SN 2005at - A neglected type Ic supernova at 10 Mpc
• An HST Survey of the Disk Cluster Population of M31. I. WFPC2 Pointings
• A HST/WFPC2 survey of bright young clusters in M31. I. VdB0, a massive star cluster seen at ~= 25 Myr
• Age and structure parameters of a remote M31 globular cluster B514 based on HST, 2MASS, GALEX and BATC observations
• Comparing Young Stellar Populations Across Active Regions in the M31 Disk
• An HST/WFPC2 survey of bright young clusters in M31. IV. Ages and mass estimates
• An HST/WFPC Survey of Bright Young Clusters in M31. II. Photometry of Less Luminous Clusters in the Fields
• Age and mass constraints for a young massive cluster in M31 based on spectral-energy-distribution fitting
• Age and mass studies for young star clusters in M31 from SEDs-fit
• Age Estimations of M31 Globular Clusters from Their Spectral Energy Distributions
• The Ages of M31 Star Clusters: Spectral Energy Distribution Versus Color-Magnitude Diagram
• Why are X-ray sources in the M31 Bulge so close to Planetary Nebulae?