Photometric monitoring from 2008-2018 of 11 PPNe

We have carried out a new photometric V,R_C_ study of 12 protoplanetary nebulae, objects in the short-lived transition between the asymptotic giant branch and planetary nebula...我们针对12个原行星状星云（protoplanetary nebulae）开展了一项全新的V波段与R_C波段测光研究。该类天体处于渐近巨星分支与行星状星云之间的短暂演化过渡阶段……