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
Prabhakar Misra
中科院分区:
物理与天体物理2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

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恒星的磁场活动在晚型恒星中是一个有趣的现象。我们使用来自LAMOST的406069颗晚型恒星的中分辨率光谱观测来探索它们的性质。我们对恒星的磁活动及其相关的物理参数进行了统计分析。我们的样本与其他数据库(LAMOST DR5、VSX和SDSS DR12)交叉匹配,以获得更多的观测属性。计算了色球活动性指标Hα谱线的等效宽度。根据Hα线的EWS,在所分析的2108 565个光谱中,我们总共探测到了2115颗恒星的8816个具有视Hα发射的光谱。此外,其中1521颗恒星的Hα线表现出可变性。此外,我们通过将LAMOST中分辨率样本与开普勒和K2数据库进行交叉匹配,从星表中探测到与41542颗恒星有关的2132次耀斑事件。我们还证实了耀斑幅度与Rossby数的增加之间的弱关系。随着自转周期的增加,色球活动强度(L-Hα/L-β)明显减小。此外,还发现耀斑能量与恒星光度之比随着恒星质量的增加而减小。
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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影响因子: --
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期刊: New Astronomy
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期刊: The Astrophysical Journal
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DOI: 10.3847/1538-4365/aadf81
发表时间: 2018-10
期刊: Astrophysical Journal, The - Supplement Series
影响因子: --
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