所有的大质量恒星都是在OB星协和星团中诞生的吗？
Were All Massive Stars Born in OB Associations and Clusters?
摘要：
一般认为，所有大于10 Msun的大质量恒星都诞生于OB星协或星团。然而，银河系或麦哲伦星云中的许多O型和B型恒星似乎是孤立存在的。虽然这些场OB星中有一些是从它们的诞生地被弹射出来的，但有些离大质量恒星形成区太远，不可能是离家出走的。大质量恒星可以孤立形成吗？斯皮策对大麦云云（又名SAGE）的调查为我们提供了一个独特的机会来调查和描述整个星系大质量恒星的形成地点。我们已经确定了大麦云星云中所有的大质量年轻恒星天体。我们发现，约85%的大规模YSO是在巨大的分子云和约65%的OB协会。只有约7%的大质量YSO既不属于OB协会，也不属于巨型分子云。在大麦云星云中，孤立的大质量恒星所占的比例相当于银河系中的5-10%。
英文摘要：
It has been commonly conjectured that all massive >10 Msun stars are born in OB associations or clusters. Many O and B stars in the Galaxy or the Magellanic Clouds appear to exist in isolation, however. While some of these field OB stars have been ejected from their birthplaces, some are too far away from massive star forming regions to be runaways. Can massive stars form in isolation? The Spitzer survey of the Large Magellanic Cloud (aka SAGE) provides a unique opportunity for us to investigate and characterize the formation sites of massive stars for an entire galaxy. We have identified all massive young stellar objects (YSOs) in the Large Magellanic Cloud. We find that ~85% of the massive YSOs are in giant molecular clouds and ~65% are in OB associations. Only ~7% of the massive YSOs are neither in OB associations nor in giant molecular clouds. This fraction of isolated massive stars in the Large Magellanic Cloud is comparable to the 5-10% found in the Galaxy.
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