Expanding Shells of Neutral Hydrogen as Birthplaces of Stellar Associations
Expanding Shells of Neutral Hydrogen as Birthplaces of Stellar Associations
复制标题
膨胀的中性氢壳作为恒星协会的诞生地
DOI：
10.1007/978-94-010-2263-7_11
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发表时间：
1974
期刊：
影响因子：
--
通讯作者：
R. Sancisi
中科院分区：
文献类型：
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作者：
R. Sancisi
已发现中性氢的膨胀壳层与 Per OB2 和 Sco OB2 的缔合有关。外壳还含有灰尘和分子。讨论了气体、尘埃和恒星的空间结构和运动学模型。协会的星星位于外面，靠近贝壳；气体和恒星从共同的膨胀中心向外移动。如果这些壳层被解释为被星际介质强烈减速的古老超新星遗迹，则可以获得 1 × 106 年量级的年龄。提出了恒星和贝壳之间的遗传关系。恒星是在最致密的气体壳层中形成的；随后，由于星际物质的介入，壳层的速度进一步减慢，它们与气体分离。恒星形成的时间尺度受到限制。恒星形成时壳层的几何形状和运动也解释了 Per OB2 和 Sco OB2 的运动学。
Expanding shells of neutral hydrogen have been found connected with the associations Per OB2 and Sco OB2. The shells also contain dust and molecules. A model of the spatial configuration and the kinematics of gas, dust and stars is discussed. The stars of the associations lie outside, close to the shells; gas and stars move outward from a common centre of expansion. If the shells are interpreted as old supernova remnants which have been strongly decelerated by the interstellar medium, ages of the order of 1 × 106 yr are obtained. A genetic relationship between stars and shells is suggested. The stars formed in the densest gas shell; afterwards they separated from the gas, as the shell was further slowed down by intervening interstellar matter. Limits are set on the time scale of star formation. The geometry and the motion of the shell at the moment of star formation account also for the kinematics of Per OB2 and Sco OB2.