An Isochrone Database and a Rapid Model for Stellar Population Synthesis

Abstract

We first presented an isochrone database that can be widely used for stellar population synthesis studies and colour-magnitude diagram (CMD) fitting. The database consists of the isochrones of both single star and binary star simple stellar populations (ss-SSPs and bs-SSPs). The ranges for the age and metallicity of populations are 0--15 Gyr and 0.0001--0.03, respectively. All data are available for populations with Salpeter IMF and Chabrier IMF. Then based on the isochrone database, we built a rapid stellar population synthesis (RPS) model and calculated the high-resolution (0.3 AA) integrated spectral energy distributions (SEDs), Lick indices and colour indices for bs-SSPs and ss-SSPs. In particular, we calculated the UBVRIJHKLM colours, ugriz colours and some composite colours that consist of magnitudes on different systems. As an example for applying the isochrone database for CMD fitting, we fitted the CMDs of star clusters M67 and NGC1868 and obtained their distance moduli, colour excesses, stellar metallicities and ages. The results showed that the isochrones of bs-SSPs are closer to those of real star clusters. The isochrone database, colours, Lick indices of populations can be downloaded via http://www.ynao.ac.cn/~bps/zhongmu/download.htm

11 pages, 18 figures, Accepted by MNRAS

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• Stellar Populations and the Star Formation Histories of LSB Galaxies: III. Stellar Population Models
• BayeSED: A General Approach to Fitting the Spectral Energy Distribution of Galaxies
• Stellar loci II. a model-free estimate of the binary fraction for field FGK stars
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• Powerful CMD: A Tool for Colour-Magnitude Diagram Studies
• Explanation of a special color-magnitude diagram of star cluster NGC 1651 from different models
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• Potential Importance of Binary Evolution in UV-Optical Spectral Fitting of Early-Type Galaxies
• The red halos of SDSS low surface brightness disk galaxies
• Integrated spectral energy distributions of binary star composite stellar populations
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• The Ages of M31 Star Clusters: Spectral Energy Distribution Versus Color-Magnitude Diagram
• A Binary Study of Colour-Magnitude Diagrams of 12 Globular Clusters