基于LAMOST DR8光谱搜寻白矮星

doi:10.3969/j.issn.1000-8349.2024.01.07

YNAO OpenIR > 大样本恒星演化研究组

	基于LAMOST DR8光谱搜寻白矮星
其他题名	Searching for White Dwarfs Based on LAMOST DR8 Spectrum
	蔡靖豪1,2,3,4 ; 韩占文1,2,3,4 ; 邢丽峰1,3,4 ; 任娟娟 5; 李蛟 5
发表期刊	天文学进展/Progress in Astronomy
	2024-03
卷号	42 期号:01 页码:102-114
DOI	10.3969/j.issn.1000-8349.2024.01.07
分类号	P145.5
产权排序	第1完成单位
收录类别	核心 ; CSCD
关键词	白矮星光谱 LAMOST
摘要	白矮星是中小质量恒星演化末期残留的简并内核，是宇宙中绝大多数恒星的演化归宿。白矮星的大样本观测性质不仅可以为恒星演化理论提供检验与约束，还可以被用于研究银河系的形成历史与演化。结合Gaia的高精度测光和周年视差数据，在LAMOST第八次数据发布(DR8)低分辨率光谱数据中搜寻白矮星。通过使用模版匹配的方法，在LAMOST DR8中共找到4 692颗白矮星和85颗激变变星，其中2 876个目标在之前的工作中已经被证认为白矮星，1 854个目标为首次在LAMOST中发现的白矮星。目视确认后对白矮星光谱型进行了详细的分类。经过对比，该白矮星样本的完备性为80%，分类的准确性达到99%，最终得到的LAMOST白矮星很好地反映不同类型的白矮星在Gaia CMD图上的分布。
其他摘要	White dwarfs are the degenerate stellar cores remaining at the end of the evolution of low- and median-mass stars, which represent the final fate of more than 97% of the celestial bodies in the Milky Way. White dwarfs contain the information of stars from birth to death, which can be used to constrain the theory of stellar evolution, such as the mass loss rate in the post-AGB stage at the end of stellar evolution, which also directly affects the initial-final mass relation of stars. White dwarfs may arise from the evolution of multiple star systems. It is estimated that 25% ∼ 30% of white dwarfs are the outcome of binary or multiple star mergers, and white dwarfs with a mass less than 0. 4 M⊙ are generally considered to be the result of binary evolution. Therefore, white dwarfs can be used to verify the binary star evolution theory. The white dwarf cooling sequence provides an independent cosmic clock to constrain the ages of the various stellar populations in the Milky Way. Since the white dwarf population contain information about the formation history and evolution of the Milky Way, and the study of the properties of the white dwarf population requires a large number of well-defined white dwarf samples. Combining Gaia’s high-precision photometry and annual parallax data, we searched for white dwarfs in the low-resolution spectroscopic data of the eighth data release (DR8) of LAMOST. By using the method of template matching, a total of 4 692 white dwarfs and 85 cataclysmic variables were found in LAMOST DR8, among which 2 876 objects were proved to be white dwarfs in the previous work, and 1 854 objects were white dwarfs discovered in LAMOST for the first time. After visual confirmation, we carried out a detailed classification of the white dwarf spectral types. After comparison, the completeness of the white dwarf sample is 80%, and the accuracy of classification is 99%. The final LAMOST white dwarf sample can well refiect the distribution of different types of white dwarfs on the Gaia CMD map.
资助项目	国家自然科学基金[12090043]; 国家自然科学基金[12288102]
项目资助者	国家自然科学基金[12090043, 12288102]
语种	中文
学科领域	天文学 ; 恒星与银河系
ISSN	1000-8349
URL	查看原文
CSCD记录号	CSCD:7685874
引用统计
文献类型	期刊论文
版本	出版稿
条目标识符	http://ir.ynao.ac.cn/handle/114a53/27045
专题	大样本恒星演化研究组中国科学院天体结构与演化重点实验室
作者单位	1.中国科学院云南天文台; 2.中国科学院大学; 3.中国科学院天体结构与演化重点实验室; 4.云南省国际超新星研究重点实验室; 5.中国科学院国家天文台
第一作者单位	中国科学院云南天文台
推荐引用方式 GB/T 7714	蔡靖豪,韩占文,邢丽峰,等. 基于LAMOST DR8光谱搜寻白矮星[J]. 天文学进展/Progress in Astronomy,2024,42(01):102-114.
APA	蔡靖豪,韩占文,邢丽峰,任娟娟,&李蛟.(2024).基于LAMOST DR8光谱搜寻白矮星.天文学进展/Progress in Astronomy,42(01),102-114.
MLA	蔡靖豪,et al."基于LAMOST DR8光谱搜寻白矮星".天文学进展/Progress in Astronomy 42.01(2024):102-114.

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