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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/71341


    Title: Flare activities of M dwarfs in the Kepler data archjw with LAMOST observation
    Authors: 張瀚元;Chang,Han-Yuan
    Contributors: 天文研究所
    Keywords: 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
    Date: 2016-08-30
    Issue Date: 2016-10-13 12:45:33 (UTC+8)
    Publisher: 國立中央大學
    Abstract: 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.
    Appears in Collections:[天文研究所] 博碩士論文

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