Temporal-spatial distribution of YSOs nearby Taurus region

Abstract

The Taurus region is one of the most extensively studied star-forming regions (SFRs). Surveys indicate that the young stars in this region are comprised of young stellar objects (YSOs) that cluster in groups associated with the molecular cloud (Grouped Young Stellar Objects, GYSOs), and some older ones that are sparsely distributed throughout the region (Distributed Young Stellar Objects, DYSOs). To bridge the age gap between the GYSOs (⩽5 Myr) and the DYSOs (10–20 Myr), we conducted a survey to search for new YSOs in this direction. Based on infrared color excesses and Li I absorption lines, we identified 145 new YSOs. Combining these with the previously identified GYSOs and DYSOs, we constructed a sample of 519 YSOs that encompass the entire region. Subsequently, we calculated the ages of the samples based on their proximity to the local bubble. The age versus distance to the local bubble (D_LB) relationship for the DYSOs shows a clear trend: the farther they are from the local bubble, the younger they are, which is consistent with the supernovae-driven formation scenario of the local bubble. The GYSOs also exhibit a mild age versus D_LB trend. However, they are significantly younger and are mostly confined to distances of 120 to 220 pc. Considering their distribution in the age versus D_LB space is well separated from the older DYSOs, they may also be products of the local bubble but formed in more recent and localized events.