Age and mass constraints for a young massive cluster in M31 based on spectral-energy-distribution fitting

Abstract

VDB0-B195D is a massive, blue star cluster in M31. It was observed as part of the Beijing-Arizona-Taiwan-Connecticut (BATC) Multicolor Sky Survey using 15 intermediate-band filters covering a wavelength range of 3000--10,000 Å. Based on aperture photometry, we obtain its spectral-energy distribution (SED) as defined by the 15 BATC filters. We apply previously established relations between the BATC intermediate-band and the Johnson-Cousins $UBVRI$ broad-band systems to convert our BATC photometry to the standard system. A detailed comparison shows that our newly derived $VRI$ magnitudes are fully consistent with previous results, while our new $B$ magnitude agrees to within $2\sigma$. In addition, we determine the cluster's age and mass by comparing its SED (from 3000 to 20,000Å, comprising photometric data in the 15 BATC intermediate bands, optical broad-band $BVRI$, and 2MASS near-infrared $JH{K}_{\mathrm{s}}$ data) with theoretical stellar population synthesis models, resulting in age and mass determinations of $60.0\pm 8.0$~Myr and $(1.1-1.6)\times 10^5{M}_{\odot }$, respectively. This age and mass confirms previous suggestions that VDB0-B195D is a young massive cluster in M31.

Accepted for Publication in AJ, 12 pages, 4 figures and 7 tables

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• Lick Indices and Spectral Energy Distribution Analysis based on an M31 Star Cluster Sample: Comparisons of Methods and Models
• The Ages of M31 Star Clusters: Spectral Energy Distribution Versus Color-Magnitude Diagram
• 2MASS photometry and age estimate of globular clusters in the outer halo of M31
• Comparisons of Different Fitting Methods for the Physical Parameters of A Star Cluster Sample of M33 with Spectroscopy and Photometry
• The Effects of the WISE/GALEX Photometry for the SED-Fitting with M31 Star Clusters and Candidates
• Structural Parameters for Globular Clusters in the Outer Halo of M31