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THE H II REGION KR 140t SPONTANEOUS FORMATION OF A HIGH-MASS STAR

机译：H II区KR 140t自发形成一颗高质量恒星

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摘要

We have used a multiwavelength data set from the Canadian Galactic Plane Survey (CGPS) to study the Galactic H II region KR 140, both on the scale of the nebula itself and in the context of the star- forming activity in the nearby W3/W4/W5 complex of molecular clouds and H Il regions. From both radio and infrared data we have found a covering factor of about 0.5 for KR 140, and we interpret the nebula as a bowl-shaped region viewed close to face on. Extinction measurements place the region on the near side of its parent molecular cloud. The nebula is kept ionized by one O8.5 V(e) star, VES 735, which is less than a few million years old. CO data show that VES 735 has disrupted much of the original molecular cloud for which the estimated mass and density are about 5000 Mo and 100 cm~-3, respectively. KR 140 is isolated from the nearest star-forming activity, in W3. Our data suggest that KR l40 is an example of spontaneous (i.e., nontriggered) formation of , unusually, a high-mass star.
机译：我们使用了来自加拿大银河平面调查（CGPS）的多波长数据集，以星云本身的尺度以及附近W3 / W4的恒星形成背景研究了银河H II区KR 140。 / W5分子云和H II区的复合物。从无线电和红外数据中，我们发现KR 140的覆盖因子约为0.5，并且我们将星云解释为靠近脸部观察的碗状区域。消光测量将区域放置在其母体分子云的近侧。星云被一颗小于几百万年历史的O8.5 V（e）恒星VES 735保持电离。 CO数据表明，VES 735破坏了许多原始分子云，据估计，它们的质量和密度分别约为5000 Mo和100 cm〜-3。 KR 140与W3中最接近的恒星形成活动隔离。我们的数据表明，KR140是高质量恒星自发形成（即未触发）的例子。

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