Identification of Candidate Members of Stellar Moving Groups

• Main Authors: Chang-Yao Chen, 陳長趯
• Other Authors: Wen-Ping Chen
• Format: Others
• Language: en_US
• Published: 2016
• Online Access: http://ndltd.ncl.edu.tw/handle/36989929177222131700

碩士 === 國立中央大學 === 物理學系 === 104 === 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.