Formation of second-generation stellar populations in globular clusters: the role of binary stars and stellar collisions

IF 2.1 4区物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS

Astrophysics and Space Science Pub Date : 2026-03-04 DOI:10.1007/s10509-026-04555-7

Suparna Sau, Pratap Ray

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Abstract

This paper aims to explore the impact of binary stars on the creation of second generation stellar populations using a model based on stellar collisions. This is accomplished by using a simple model of stellar collisions in which two first-generation stars collide and produce a product star belonging to the second-generation stellar population. Clusters are formed with single and binary stars having masses generated from a truncated Pareto distribution using Monte Carlo simulations and the split core pairing algorithm to form binary stars. No triples or further multiple stars are considered. We have considered single-single and single-binary collisions in our model. Then we studied the correlations between the fraction of second-generation stars and the slope of present-day mass function of the after-collision cluster and have compared those with observed data for 49 galactic globular clusters. We find that the fraction of second-generation stars is positively correlated to the slope of mass function for high-mass clusters and low-mass clusters separately. We additionally explore the possible values of the fraction of binary stars, the fraction of colliding single stars, the fraction of colliding binary stars as well as the slopes of the initial mass generating function that led to the formation of the present day observed high mass and low mass clusters.

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球状星团中第二代恒星群的形成：双星和恒星碰撞的作用

本文旨在利用基于恒星碰撞的模型探索双星对第二代恒星种群产生的影响。这是通过使用一个简单的恒星碰撞模型来实现的，在这个模型中，两颗第一代恒星碰撞并产生一颗属于第二代恒星群的产物星。利用蒙特卡罗模拟和分裂核配对算法，由截断的帕累托分布生成质量的单星和双星组成星团。不考虑三重星或更多的多重星。我们在模型中考虑了单-单碰撞和单-双碰撞。然后，我们研究了第二代恒星的比例与碰撞后星团现今质量函数斜率之间的相关性，并将其与49个银河系球状星团的观测数据进行了比较。我们发现第二代恒星的比例分别与高质量星团和低质量星团的质量函数斜率呈正相关。我们还探索了双星比例、单星碰撞比例、双星碰撞比例的可能值，以及导致目前观测到的高质量和低质量星团形成的初始质量生成函数的斜率。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Astrophysics and Space Science 地学天文-天文与天体物理

CiteScore

3.40

自引率

5.30%

发文量

106

审稿时长

2-4 weeks

期刊介绍： Astrophysics and Space Science publishes original contributions and invited reviews covering the entire range of astronomy, astrophysics, astrophysical cosmology, planetary and space science and the astrophysical aspects of astrobiology. This includes both observational and theoretical research, the techniques of astronomical instrumentation and data analysis and astronomical space instrumentation. We particularly welcome papers in the general fields of high-energy astrophysics, astrophysical and astrochemical studies of the interstellar medium including star formation, planetary astrophysics, the formation and evolution of galaxies and the evolution of large scale structure in the Universe. Papers in mathematical physics or in general relativity which do not establish clear astrophysical applications will no longer be considered. The journal also publishes topically selected special issues in research fields of particular scientific interest. These consist of both invited reviews and original research papers. Conference proceedings will not be considered. All papers published in the journal are subject to thorough and strict peer-reviewing. Astrophysics and Space Science features short publication times after acceptance and colour printing free of charge.