Revisiting the Activity-Rotation Relation for Evolved Stars

被引：0
|
作者：
Han, Henggeng [1 ]
Wang, Song [1 ,2 ]
Li, Xue [1 ,3 ]
Zheng, Chuanjie [1 ,3 ]
Liu, Jifeng [1 ,2 ,3 ,4 ]
机构：
[1] Chinese Acad Sci, Key Lab Opt Astron, Natl Astron Observ, Beijing 100101, Peoples R China
[2] Beijing Normal Univ, Inst Frontiers Astron & Astrophys, Beijing 102206, Peoples R China
[3] Univ Chinese Acad Sci, Sch Astron & Space Sci, Beijing 100049, Peoples R China
[4] Chinese Acad Sci, Natl Astron Observ, New Cornerstone Sci Lab, Beijing 100012, Peoples R China
来源：
ASTROPHYSICAL JOURNAL | 2024年 / 977卷 / 02期
基金：
中国国家自然科学基金;
关键词：
CA-II H; STELLAR MODEL CHROMOSPHERES; X-RAY ACTIVITY; MAGNETIC ACTIVITY; COOL STARS; GIANTS; ULTRAVIOLET; EVOLUTION; EMISSION; HABITABILITY;
D O I：
10.3847/1538-4357/ad957a
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
The magnetic dynamo mechanism of giant stars remains an open question, which can be explored by investigating their activity-rotation relations with multiple proxies. By using the data from the LAMOST and Galaxy Evolution Explorer surveys, we carried out a comprehensive study of activity-rotation relations of evolved stars based on Ca ii H and K lines, H alpha lines, and near-ultraviolet (NUV) emissions. Our results show that evolved stars and dwarfs obey a similar power law in the unsaturated region of the activity-rotation relation, indicating a common dynamo mechanism in both giants and dwarfs. There is no clear difference in the activity levels between red giant branch stars and red clump stars, nor between single giants and those in binaries. Additionally, our results show that the NUV activity levels of giants are comparable to those of G- and K-type dwarfs and are higher than those of M dwarfs.
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页数：8
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