尋找移動星群的成員星;Identification of Candidate Members of Stellar Moving Groups

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題名:	尋找移動星群的成員星;Identification of Candidate Members of Stellar Moving Groups
作者:	陳長趯;Chen,Chang-Yao
貢獻者:	物理學系
關鍵詞:	星團與星協;動力學;Star clusters and associations;Kinematics
日期:	2016-01-22
上傳時間:	2016-03-17 20:37:20 (UTC+8)
出版者:	國立中央大學
摘要:	這篇論文呈現我們利用動力學指認移動星群成員星的成果。論文的第一部分展示我們在克普勒星場中尋找繪架座β、劍魚座AB，與長蛇座TW這三個移動星群的可能成員星。利用美國海軍天文台巡天觀測(UCAC4)的自行速度、我們估算的光度距離與郭守敬望遠鏡(LAMOST)的徑向速度資料，我們共找到103個星體符合移動星群的移動速度。考慮候選星的年齡應與已知的移動星群成員相符，在103顆候選星中，我們找到一顆屬於劍魚座AB星群的可能成員星擁有年輕星球的象徵(閃焰現象)，與迴轉年代學估算出的年輕年齡(約9億年老)。而在眾多缺少徑向速度資料的星體中，有29顆為倫琴衛星星表(ROSAT)的X射線源，這些可能是年輕、活耀的星球。本篇論文的第二部分展示我們在75顆擁有岩屑盤的星體中辨認移動星群成員的成果。透過動力學的篩選，我們一共找到了20顆候選星擁有移動星群相似的空間運動速度；其中16顆星體分別為幾個移動星群和天蠍-半人馬星協的已知成員，而這些已知成員星證實我們的篩選能有效並正確地指出成員星。對於非已知成員星的四顆星體，藉由討論運動速度、空間分布與文獻中估計的年齡；最終我們提出3顆可能的成員星(HIP 20884隸屬於天鴿座、HIP 22845隸屬於劍魚座AB，和HIP 48613隸屬於長蛇座TW移動星群)。 ;We present the identification of candidate members of stellar moving groups using stellar kinematics. The first part of this thesis shows the work of finding candidate members of the Beta Pictoris, AB Doradus, and TW Hydrae moving groups toward the Kepler field. Based on the UCAC4 proper motions, our estimated photometric distances, and the LAMOST radial velocity data, we found a total of 103 candidate members sharing similar space motions as their corresponding moving groups. Among these kinematic candidates, 23 of them with consistent LAMOST radial velocities at different epochs are probable kinematic candidates. Considering a probable candidate should be as young as those of a moving group, we proposed a kinematic candidate (KIC 6224062) with flares and the gyrochronological age of ~ 90 Myr as a probable member of the AB Doradus group. For the candidates without radial velocity data, we found 29 ROSAT X-ray sources as likely young stars or active dwarfs. In the second part of this thesis, we applied our kinematic selection on 75 stars in the solar neighborhood with debris disks, which were considered as young stars. Except 5 stars with no radial velocity data, we found 20 stars as likely kinematic members, 16 of which are already known members of moving groups or of the Sco-Cen association. For the rest 4 stars considering the positional and kinematic parameters (XYZUVW), and the ages from literature, we proposed 3 probable members (HIP 20884 of the Columba, HIP 22845 of the AB Doradus, and HIP 48613 of the TW Hydrae) of moving groups.
顯示於類別:	[物理研究所] 博碩士論文

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