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类太阳色球活动恒星的高色散光谱观测和锂丰度
Alternative TitleHigh-dispersion Spectroscopic Observations and Lithium Abundance of the Chromospherically Active Solar-type Stars
李远超1,2,3; 邢丽峰1,2,3
Source Publication天文学报/Acta Astronomica Sinica
2021-09
Volume62Issue:05Pages:53-61
DOI10.15940/j.cnki.0001-5245.2021.05.004
ClassificationP144
Contribution Rank第1完成单位
Indexed ByCSCD ; 核心
Keyword恒星:丰度 恒星:晚型 恒星:色球 X射线:恒星
Abstract

基于对9颗类太阳色球活动恒星高信噪比的高色散光谱观测,测量了这些恒星锂线(λ=6707.8?)的等值宽度,计算了这些恒星表层锂元素丰度.通过研究这些类太阳色球活动恒星锂丰度和X射线光度之间的关系,发现X射线光度强的类太阳色球活动恒星锂丰度值大于X射线较弱的恒星.也就是说活动性较强的类太阳色球活动恒星其锂丰度较高,活动性较弱的类太阳色球活动恒星其锂丰度较低.考虑到主序的类太阳恒星锂元素和恒星自转速度随着恒星年龄的增加逐渐减少,以及随着类太阳色球活动恒星自转速度的减小,色球活动又逐渐变弱.因此类似于锂丰度,类太阳色球活动恒星自转速度的大小和恒星的活动水平也同样可以表明恒星的年龄. 

Other Abstract

Based on the high signal-to-noise ratio (S/N) and high-dispersion spectroscopic observations, we derived the equivalent width of the Li I  6707. 8 ˚A and the lithium abundance for 9 active late-type stars. The correlation between the lithium abundance and the X-ray luminosity (lg LX) indicates that the lithium abundance of these 9 active late-type stars with a higher X-ray luminosity tends to be larger than that of those with lower X-ray luminosity. That is to say that the lithium abundances analogs progressively increase as the activity increases for these late-type stars. Considering both the lithium abundance and the rotational velocity decreases with increasing stellar age for main-sequence stars and activity increasing with increasing rotation velocity for active late-type stars, like lithium abundance, the rotational velocity and stellar activity are also considered good indicators of age for late-type stars.

Funding Project国家自然科学基金项目[U1831125] ; 国家自然科学基金项目[E1110101] ; 国家自然科学基金项目[U1331118]
Funding Organization国家自然科学基金项目[U1831125, E1110101, U1331118]
Language中文
Subject Area天文学 ; 恒星与银河系 ; 恒星天文学 ; 恒星形成与演化
MOST Discipline Catalogue理学 ; 理学::天文学
ISSN0001-5245
CSCD IDCSCD:7060781
Citation statistics
Document Type期刊论文
Version出版稿
Identifierhttp://ir.ynao.ac.cn/handle/114a53/24568
Collection南方基地
中国科学院天体结构与演化重点实验室
Corresponding Author邢丽峰
Affiliation1.中国科学院云南天文台;
2.中国科学院天体结构与演化重点实验室;
3.中国科学院大学
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Corresponding Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
李远超,邢丽峰. 类太阳色球活动恒星的高色散光谱观测和锂丰度[J]. 天文学报/Acta Astronomica Sinica,2021,62(05):53-61.
APA 李远超,&邢丽峰.(2021).类太阳色球活动恒星的高色散光谱观测和锂丰度.天文学报/Acta Astronomica Sinica,62(05),53-61.
MLA 李远超,et al."类太阳色球活动恒星的高色散光谱观测和锂丰度".天文学报/Acta Astronomica Sinica 62.05(2021):53-61.
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