S316p.43 — Searching for Possible Members of the Beta Pictoris Moving Group in the Kepler Field

Date & Time

Aug 10th at 6:00 PM until 7:30 PM




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Author(s): Chang Yao Chen1, Wen-Ping Chen1

Institution(s): 1. Department of Physics, National Central University

Most if not all stars are formed in clustered environments in molecular clouds. Star clusters eventually dissolve and supply the disk stellar population. Stellar moving groups are living fossils of how the disintegration process takes place. So far there are a handful of moving groups known, including the Beta Pictoris moving group (BPMG), which consists of 55 known stellar systems sharing similar space motion as Beta Pictoris, the prototypical star with a planetary debris disk. Based on the mean space motion of known members, and assuming a range of heliocentric distances, we computed the proper motion and radial velocity expected for a member toward any line of sight in the whole sky. On the basis of UCAC4 proper motion and the photometric distance, we have identified about 750 BPMG candidates in the Kepler Field. While most of these candidates have no radial velocity measurements, 31 candidates show LAMOST radial velocities consistent with membership. There are three candidates with no radial velocity data but are ROSAT X-ray sources indicative of possible stellar youth. Even though the radial velocity provides an additional constraint on membership, variation caused by binary orbital motion should be first excluded, i.e., measurements at different epochs are required. Radial velocity data of the candidates are being taken. We will present the current status of the program.