Flare activities of M dwarfs in the Kepler data archjw with LAMOST observation

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题名:	Flare activities of M dwarfs in the Kepler data archjw with LAMOST observation
作者:	張瀚元;Chang,Han-Yuan
贡献者:	天文研究所
关键词:	恆星;恆星活動;恆星閃焰;M型恆星;低質量恆星;stars;activity - stars;flare - stars;late-type - stars;low-mass - stars
日期:	2016-08-30
上传时间:	2016-10-13 12:45:33 (UTC+8)
出版者:	國立中央大學
摘要:	M 型主序星通常是有著接近或完全對流的外層，由於他們對流的外層產生強烈的磁場，常常可以在光譜上有見到色球層的 Hα 譜線的 M 型主序星也會有閃焰的發生。另外，跟 G 型主序星（類似太陽的恆星）相比，M 型主序星的適居帶非常靠近他們主星，對於在 M 型主序星適居帶上的系外行星的適居性可能會受到閃焰的影響，因此研究 M 型主序星的閃焰一個有趣的研究題目。本篇論文是用了 Kepler 太空望遠鏡的資料以及 LAMOST 望遠鏡的光譜資料來做研究，主要的 M 型主序星都是屬於 M0 到 M3 的分類，從 Kepler 的觀測資料中計算出來的自轉週期跟閃焰的大小、閃焰頻率分布的指數、以及 Hα 譜線的等值寬度有密切的關聯，可以看到有明顯的趨勢在快速自轉（自轉週期低於 15 天）的 M 型主序星上。;The M dwarfs are usually known with their convective envelopes. Due to the strong magnetic activities associated with their convective envelopes, M dwarfs showing strong chromospheric emission in Hα line have large flare activities in general. Moreover, comparing with G dwarfs, the habitable zone is much closer to M dwarfs. The habitability of the exoplanet might be affected by flares of M dwarfs and, therefore, it is interesting to investigate the flare phenomena of M dwarfs. This thesis provides a sample of the LAMOST spectra of the early M dwarfs (i.e., M0 – M3) to compare with the Kepler observations. The rotational periods derived from the Kepler measurements are highly correlated with flare intensity, the power-law index of distribution and the equivalent widths of the Hα line emission. We found that fast rotating (i.e., rotational periods < 15 day) M dwarfs have more magnetic activities.
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