亚矮星研究的新进展

The New Progress of Subdwarf Star Studies

本文从近几年最新的观测数据出发,用统计学方法对亚矮星每一子类各个观测参量进行了系统的分析研究,包括热亚矮星双星系统轨道周期、伴星质量分布以及有效温度和光度图;同时,从理论上对每一类亚矮星的形成通道进行详细的分析总结;最后,将这些大量观测数据与理论模拟结果进行比较.结果表明,热亚矮星单星模型和双星模型都可以解释热亚矮星的形成,A型亚矮星是由贫金属主序星和极低质量白矮星这两类恒星组成的.

Based on the latest observation data in recent years,we systematically study and analyze parameters of each subclass of subdwarf stars by using statistical methods,including the orbital period of the binary systems,the mass distribution of companion stars of hot subdwarf stars,and the effective temperature and luminosity;meanwhile,we also theoretically analyze and summarize the formation channels of each type of subdwarf stars;finally,we compare these observation data with the theoretical simulation results.We conclude that both single-star model and binary models of hot subdwarf stars can explain the formation of hot subdwarf stars.Type A subdwarf stars(sdAs)are composed of metal-poor main sequence stars(MSs)and extremely low-mass white dwarfs(ELM WDs).