arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 0809.0265astro-ph
收藏

用于星族合成研究的大型恒星演化数据库。IV。综合性质和光谱

A large stellar evolution database for population synthesis studies. IV. Integrated properties and spectra

Susan M. Percival, Maurizio Salaris, Santi Cassisi, Adriano Pietrinferni

摘要:

这篇文章是描述BaSTI恒星演化数据库最新增加内容的系列文章中的第4篇,该数据库由一系列用于人口合成研究的均质模型和工具组成。在这里,我们提出了一套新的低和高分辨率的合成光谱的基础上的BaSTI恒星模型,涵盖了大范围的简单恒星星族(SSP)的缩放太阳能和α增强的金属混合物。这使得一个完全一致的研究光度和光谱性质的解决和未解决的恒星星族,并允许我们作出详细的测试,其综合性能。我们的低分辨率光谱适用于推导任何光度系统中的宽带幅度和颜色。这些光谱覆盖了整个波长范围(9- 160000 nm),包括所有的演化阶段,直到AGB演化的结束。我们的高分辨率光谱适合于研究线指数的行为,我们已经测试了它们对银河系球状星团的大样本。我们发现,年龄范围,铁丰度[Fe/H],α增强模型预测的程度与观测值非常匹配。我们还测试了全球的一致性的BaSTI模型的年龄和金属丰度之间的详细比较来自等时线拟合观测到的CMD,并从线指数的强度,银河系球状星团47 Tuc和疏散星团M67。对于47 Tuc,我们发现这两种方法之间存在合理的一致性,在估计的误差范围内。从与M67的比较中,我们发现不可忽略的影响所造成的统计波动,这是一个特定的方法,用于填充等时线和分配适当的光谱个别恒星的结果派生线指数。(节略)

英文摘要:

This paper is the 4th in a series describing the latest additions to the BaSTI stellar evolution database, which consists of a large set of homogeneous models and tools for population synthesis studies. Here we present a new set of low and high resolution synthetic spectra based on the BaSTI stellar models, covering a large range of simple stellar populations (SSPs) for both scaled solar and alpha-enhanced metal mixtures. This enables a completely consistent study of the photometric and spectroscopic properties of both resolved and unresolved stellar populations, and allows us to make detailed tests on their integrated properties. Our low resolution spectra are suitable for deriving broadband magnitudes and colors in any photometric system. These spectra cover the full wavelength range (9-160000nm) and include all evolutionary stages up to the end of AGB evolution. Our high resolution spectra are suitable for studying the behaviour of line indices and we have tested them against a large sample of Galactic globular clusters. We find that the range of ages, iron abundances [Fe/H], and degree of alpha-enhancement predicted by the models matches observed values very well. We have also tested the global consistency of the BaSTI models by making detailed comparisons between ages and metallicities derived from isochrone fitting to observed CMDs, and from line index strengths, for the Galactic globular cluster 47Tuc and the open cluster M67. For 47Tuc we find reasonable agreement between the 2 methods, within the estimated errors. From the comparison with M67 we find non-negligible effects on derived line indices caused by statistical fluctuations, which are a result of the specific method used to populate an isochrone and assign appropriate spectra to individual stars. (abridged)

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。

↑