摘要
对从IRAS点源表中选择出来的原行星状星云的光学证认和有缝光谱、CCD直接成像观测表明,其中三个与致密的反射星云成协,即PPN No.34=IRAS16559—2957、PPN No.35=IRAS16552—3050和PPN No.38=IRAS17150—3224。本文根据球对称尘埃壳层模型,计算了中心星光度和颜色的变化,反射星云的可见期等。认为近距的原行星状星云在早中期阶段将有致密的反射星云与它成协。
From optical identifications, slit spectroscopic and CCD direct imaging observations it is shown that at least 3 of 42 PPN candidates in the southern sky, selected from the IRAS PSC, are associated with compact reflection nebulae,.e. PPN No. 34 = IRAS16559-2957, No. 35 = IRAS16552-3050, and No. 38 = IRAS17150-3224. Our model calculation, assuming spherical symmetry, suggests that association with compact reflection nebulae could be an important behaviour of nearby protoplanetary nebulae in their earlyintermediate phases.
关键词
行星状
星云
星云成协
反射
Interstellar medium-Nebulae association
