估算星团参数的两种工具

E. Paunzen, M. Piecka, J. Supíková
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引用次数: 0

摘要

星团是在整个星团的引力场作用下聚集在一起的恒星。某个星团中的恒星诞生于一个巨大的分子云中,因此可以被视为年龄几乎相等的天体。此外,假设云中的初始物质完全混合,我们也可以说所有星团成员的金属性是相同的。四个参数(距离、消光或红化、年龄和金属度)是描述星团的标准参数。了解这些参数对于研究星系的局部和全局特性(尤其是我们自己的银河系)至关重要。然而,推导这些参数需要花费大量的时间和精力。多亏了盖亚任务的视差测量,我们才能以前所未有的精度确定银河系内恒星(和星团)的距离。因此,我们可以将距离从自由参数列表中移除。我们开发了两种不同的工具来估算星团参数:1)Metalcode,这是一个自动工具,主要用于推导疏散星团的金属性;2)Stellar Isochrone Fitting Tool (StIFT),这是一个工具,用于拟合任何现有测光系统的等时线网格。我们将详细介绍这两个工具。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
TWO TOOLS FOR ESTIMATING STAR CLUSTER PARAMETERS
A star cluster is a composition of stars held together by the overall gravitational field of the whole cluster. The stars of a given cluster are born in a giant molecular cloud and, as such, can be regarded as objects with almost equal ages. Furthermore, assuming that the initial material in the cloud is perfectly mixed, we may also say that the metallicity of all cluster members is the same. Four parameters (distance, extinction or reddening, age, and metallicity) are standardly used to describe star clusters. Their knowledge is essential for studying galaxies’ local and global properties (especially our own Galaxy). However, deriving these parameters may take time and effort. Thanks to the Gaia mission’s parallax measurements, we can determine the distances of stars (and clusters) within our Galaxy with unprecedented precision. Therefore, we can remove the distance from the list of free parameters. We developed two different tools for estimating cluster parameters: 1) Metalcode, an automatic tool focused on deriving metallicities of open clusters, and 2) Stellar Isochrone Fitting Tool (StIFT), a tool for fitting a grid of isochrones for any photometric system available. We present both tools in more detail.
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