树胶星云中与彗球状体有关的年轻恒星天体的动力学
Kinematics of the Young Stellar Objects associated with the Cometary Globules in the Gum Nebula
摘要：
本文分析了口香糖星云中与彗球状体有关的年轻恒星天体的自行测量结果。虽然早期基于CG径向速度测量的研究表明CG系统的膨胀，但观测到的YSO的自行没有显示膨胀的证据。特别是嵌入在CG中的两个YSO的运动学与大约150万年前$ζ$ Pup的伴星超新星爆炸作为CG系统膨胀的原因不一致。与CG相关的YSO拥有船帆座OB2星协成员星的平均自行。少数YSO有相对较大的自行被发现显示相对较低的红外过剩。
英文摘要：
An analysis of proper motion measurements of the Young Stellar Objects (YSOs) associated with the Cometary Globules (CGs) in the Gum Nebula is presented. While earlier studies based on the radial velocity measurements of the CGs suggested expansion of the system of the CGs, the observed proper motion of the YSOs shows no evidence for expansion. In particular the kinematics of two YSOs embedded in CGs is inconsistent with the supernova explosion of the companion of $ζ$ Pup about 1.5 Myr ago as the cause of the expansion of the CG system. YSOs associated with the CGs share the average proper motion of the member stars of the Vela OB2 association. A few YSOs that have relatively large proper motions are found to show relatively low infrared excesses.
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