arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0804.4473astro-ph
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达特茅斯恒星演化数据库

The Dartmouth Stellar Evolution Database

Aaron Dotter, Brian Chaboyer, Darko Jevremovic, Veselin Kostov, E. Baron, J. W. Ferguson

摘要:

对恒星星族的光度和光谱观测的深度和质量的不断扩大,增加了对年龄组成参数空间区域理论模型的需求,这些区域目前基本上未被探索。恒星演化模型需要采用最先进的物理学和涵盖广泛的组成,以提取最多的信息,从目前的观测分辨和未分辨的恒星星族。达特茅斯恒星演化数据库是一个收集恒星演化轨迹和等时线的数据库,其范围为[Fe/H]从-2.5到+0.5,[alpha/Fe]从-0.2到+0.8(对于[Fe/H] <=0)或+0.2(对于[Fe/H] >0),初始He质量分数从Y=0.245到0.40。恒星演化轨道的计算质量在0.1和4 Msun之间,允许生成年龄为2.5亿年的等时线。对于质量范围内的核心He闪光发生,单独的He燃烧轨迹计算从零年龄水平分支。轨迹和等时线已被转换到各种测光系统中的观测平面,包括标准UBV(RI)c、Stromgren uvby、SDSS ugriz、2 MASS JHK以及HST ACS-WFC和WFPC 2。达特茅斯恒星演化数据库可以通过网站http://stellar.dartmouth.edu/~models/访问,在那里可以下载所有的轨道,等时线和其他文件。

英文摘要:

The ever-expanding depth and quality of photometric and spectroscopic observations of stellar populations increase the need for theoretical models in regions of age-composition parameter space that are largely unexplored at present. Stellar evolution models that employ the most advanced physics and cover a wide range of compositions are needed to extract the most information from current observations of both resolved and unresolved stellar populations. The Dartmouth Stellar Evolution Database is a collection of stellar evolution tracks and isochrones that spans a range of [Fe/H] from -2.5 to +0.5, [alpha/Fe] from -0.2 to +0.8 (for [Fe/H] <=0) or +0.2 (for [Fe/H] >0), and initial He mass fractions from Y=0.245 to 0.40. Stellar evolution tracks were computed for masses between 0.1 and 4 Msun, allowing isochrones to be generated for ages as young as 250 Myr. For the range in masses where the core He flash occurs, separate He-burning tracks were computed starting from the zero age horizontal branch. The tracks and isochrones have been transformed to the observational plane in a variety of photometric systems including standard UBV(RI)c, Stromgren uvby, SDSS ugriz, 2MASS JHKs, and HST ACS-WFC and WFPC2. The Dartmouth Stellar Evolution Database is accessible through a website at http://stellar.dartmouth.edu/~models/ where all tracks, isochrones, and additional files can be downloaded.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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