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arXiv 0804.4520astro-ph
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英仙座OB1在高银河系轨道上的形成

On the Formation of Perseus OB1 at High Galactic Latitudes

H. -T. Lee, J. Lim

摘要:

Per OB 1星协包含了引人注目的双星系团h和chi Per,它的附近没有一个巨大的分子云,这是不寻常的。我们从依巴谷的数据表明,该协会的发光成员表现出大量的运动远离银道面,使他们的平均速度增加银道面以上的高度。我们发现HAeBe和金牛座T星对可能的残余分子云与每OB 1。这些恒星形成区位于银道面上方280-400 pc的发光成员星位置之外,远高于先前发现的嵌入星团。我们认为,观察到的发光成员星的运动是最自然的解释,如果许多形成的分子气体推动和加速向外膨胀的超级气泡驱动的恒星风,也许也超新星爆炸。一个由氢原子和尘埃组成的大壳层就在残余分子云的外面,被认为是由这样一个超级气泡驱动的,它可能包括形成这个协会的母体巨大分子云的残留物。在支持这一观点,我们发现一个星期的趋势,年轻的O型星成员躺在银河系的纬度比老的超巨星成员。位于银道面以上更高高度的恒星形成区可能对应于这个超级气泡外围或附近最近的恒星形成事件。

英文摘要:

The Per OB1 association, which contains the remarkable double cluster h and chi Per, is unusual in not having a giant molecular cloud in its vicinity. We show from Hipparcos data that the luminous members of this association exhibits a bulk motion away from the galactic plane, such that their average velocity increases with height above the galactic plane. We find HAeBe and T Tauri stars towards probable remnant molecular clouds associated with Per OB1. These star-forming regions lie well beyond the location of the luminous member stars at heights of 280-400 pc above the galactic plane, far higher than that previously found for embedded clusters. We argue that the observed motion of the luminous member stars is most naturally explained if many formed from molecular gas pushed and accelerated outwards by an expanding superbubble driven presumably by stellar winds and perhaps also supernova explosions. A large shell of atomic hydrogen gas and dust that lies just beyond the remnant molecular clouds, believed to be driven by just such a superbubble, may comprise the swept-up remains of the parental giant molecular cloud from which this association formed. In support of this picture, we find a week trend for the younger O star members to lie at higher galactic latitudes than the older supergiant members. The star-forming regions located at even larger heights above the galactic plane presumably correspond to more recent episodes of star formation at or near the periphery of this superbubble.

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