Magnetic activity based on LAMOST medium-resolution spectra and the Kepler survey
Magnetic activity based on LAMOST medium-resolution spectra and the Kepler survey
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基于 LAMOST 中分辨率光谱和开普勒巡天的磁活动
DOI:
10.1093/mnras/staa942
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发表时间:
2020-06
影响因子:
4.8
通讯作者:
Prabhakar Misra
中科院分区:
文献类型:
--
作者:
Zhang Li-yun;Long Liu;Shi Jianrong;Lu Hong-peng;Gao Qi;Han Xianming L.;Wang Haifeng;Prabhakar Misra
Stellar magnetic activity is an interesting phenomenon in late-type stars. We use the medium-resolution spectroscopic observations of 406 069 late-type stars from LAMOST to explore their properties. We perform a statistical analysis on the magnetic activity of the stars and their associated physical parameters. Our samples are cross-matched with other data bases (LAMOST DR5, VSX, and SDSS DR12) to obtain additional observational properties. The equivalent widths (EWs) of H alpha lines, an indicator of chromospheric activity, are calculated. According to the EWs of the H alpha line, we detect 8816 spectra with apparent H alpha emission for a total of 2115 stars among the 2 108 565 spectra analysed. Furthermore, 1521 of these stars show variability in their H alpha lines. In addition, we detect 2132 flare events associated with 41 542 stars from the catalogue by cross-matching our LAMOST medium-resolution samples and the Kepler and K2 data bases. We also confirm a weak relationship of the flare amplitude with increasing Rossby number. There is a clear decease in the strength of chromospheric activity (L-H alpha/L-bol) with increasing rotation period. Moreover, the ratio of the flare energy and stellar luminosity is found to decrease with the stellar mass.
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DOI:
10.1086/421364
发表时间:
2004-03
期刊:
The Astronomical Journal
影响因子:
--
作者:
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通讯作者:
A. West;S. Hawley;L. Walkowicz;K. Covey;N. Silvestri;S. Raymond;H. Harris;J. Munn;P. McGehee;P. McGehee;Ž. Ivezić;Ž. Ivezić;J. Brinkmann
影响因子:
2
作者:
Zhang Liyun;Lu Hongpeng;Han Xianming L;Jiang Linyan;Li Zhongmu;Zhang Yong;Hou Yonghui;Wang Yuefei;Cao Zihuang
通讯作者:
Cao Zihuang
DOI:
10.1086/118222
发表时间:
1996-12
期刊:
The Astronomical Journal
影响因子:
--
作者:
S. Hawley;J. Gizis;I. Reid
通讯作者:
S. Hawley;J. Gizis;I. Reid
DOI:
10.3847/1538-4357/834/1/92
发表时间:
2016-10
期刊:
The Astrophysical Journal
影响因子:
--
作者:
H.-Y. Chang;Y.-H. Song;A. Luo;L.-C. Huang;W. Ip;J. Fu;Y. Zhang;Y. Hou;Z. Cao;Y.-F. Wang
通讯作者:
H.-Y. Chang;Y.-H. Song;A. Luo;L.-C. Huang;W. Ip;J. Fu;Y. Zhang;Y. Hou;Z. Cao;Y.-F. Wang
DOI:
10.3847/1538-4365/aadf81
发表时间:
2018-10
期刊:
Astrophysical Journal, The - Supplement Series
影响因子:
--
作者:
Zong Weikai;Fu Jian-Ning;De Cat Peter;Shi Jianrong;Luo Ali;Zhang Haotong;Frasca A.;Corbally C. J.;Molenda-akowicz J.;Catanzaro G.;Gray R. O.;Wang Jiangtao;Pan Yang;Ren Anbing;Zhang Ruyuan;Jin Mengqi;Wu Yue;Dong Subo;Xie Ji-Wei;Zhang Wei;Hou Yonghui;LAMOST
通讯作者:
LAMOST