Abstract:
With the third data release of the Gaia mission, GaiaDR3with its precise photometry and astrometry,
it is now possible to study the behavior of stars at a scale never seen before. In this paper, we developed new
criteria to identify T-Tauri stars (TTS) candidates using UV and optical color-magnitude diagrams (CMDs) by
combining the GALEX and Gaia surveys. We found 19 TTS candidates and five of them are newly identified
TTS in the Taurus molecular cloud (TMC), not cataloged before as TMC members. For some of the TTS
candidates, we also obtained optical spectra from several Indian telescopes. We also present the analysis of
distance and proper motion of young stars in the Taurus using data from Gaia DR3. We found that the stars
in Taurus show a bimodal distribution with distance, having peaks at 130.171.31
−1.24 pc and 156.251.86
−5.00 pc. The
reason for this bimodality, we think, is due to the fact that different clouds in the TMC region are at different
distances.We further showed that the two populations have similar ages and proper motion distribution. Using
the Gaia DR3 CMD, we showed that the age of Taurus is consistent with 1 Myr.
