等时线数据库和恒星星族快速合成模型
An Isochrone Database and a Rapid Model for Stellar Population Synthesis
摘要：
首先介绍了一个可广泛用于恒星星族合成研究和色星等图拟合的等时线数据库。该数据库包括单星和双星简单恒星星族（ss-SSP和bs-SSP）的等时线。年龄和金属丰度的范围分别为0- 15 Gyr和0.0001- 0.03。所有数据均适用于Salpeter IMF和Chabrier IMF人群。然后基于等时线数据库，建立了快速恒星星族合成（RPS）模型，计算了bs-SSP和ss-SSP的高分辨率（0.3 AA）积分光谱能量分布（SED）、Lick指数和颜色指数。特别是，我们计算了UBVRIJHKLM颜色，ugriz颜色和一些复合颜色，包括在不同的系统的幅度。作为应用等时线数据库进行CMD拟合的一个例子，我们拟合了星团M67和NGC 1868的CMD，得到了它们的距离模、色超、恒星金属丰度和年龄。结果表明，bs-SSP的等时线更接近于真实星团的等时线。种群的等时线数据库、颜色、舔指数可通过http://www.ynao.ac.cn/~bps/zhongmu/download.htm下载
英文摘要：
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
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