【学术报告】 ～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～ 报告题目：Exploring the variety of red transients 报告人：蔡永志 报告人单位:清华大学 报告时间：2022年7月26日(星期二) 下午2：30 — 4：00 报告地点：主楼四楼会议室 报告语言: 中文 报告摘要： ～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～ In the era of modern all-sky surveys, the number of transients is increasing at an exponential rate. However, an emerging category shows absolute magnitudes intermediate between Core-Collapse Supernovae (CC SNe)and classical Novae (i.e., -15<Mv<-10 mag).They are usually dubbed as Gap Transients. In this poorly-known gap, we distinguishthem asgiant eruptions of massive stars (including luminous blue variables; LBVs), intermediate luminosity red transients (ILRTs), and luminous red novae (LRNe). ILRTs show Type IIP/L-like lightcurves and Type IIn-like spectra. The progenitor analysis suggests that ILRT precursors are moderately massive (8-15Msun), embedded in dusty cocoons. LRNe usually display double-peaked lightcurves and their spectra experience a metamorphosis evolution. The observation ofGalacticLRN V1309 Scoprovides unequivocal proofs of the final merging event.To date, ILRTs and LRNe are often merely understood phenomenologically rather than based onphysical nature.In my talk,I will present the recent results from our observational campaign of luminous red nova AT 2021biy as well as a brief overview of thecurrent observational results on ILRTs and LRNe. ～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～ 本通知也可以在云台学术报告网页看到： http://www.ynao.cas.cn/xwzx/xstg/ 申请安排学术报告的同事请参见台学术报告管理办法： http://www.ynao.cas.cn/xwzx/xstg/gzzd/ 云台邀请团组：大样本恒星演化组、云南天文台青促会小组 邀请方联系人：吴程远，18208815103 7月21日