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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >VLBI observations of water masers in onsala 1: Massive binary star-forming site?
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VLBI observations of water masers in onsala 1: Massive binary star-forming site?

机译：VLBI在onsala 1处的水脉的观测结果：大规模的双星形成站点？

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摘要

We present the proper motions of water masers toward the Onsala 1 star-forming region, observed with the Japanese VLBI network at three epochs spanning 290 days. We found that there are two water-maser clusters (WMC 1 and WMC 2) separated from each other by 1 ''.6 (2900AU at a distance of 1.8kpc). A proper-motion measurement revealed that WMC I is associated with a bipolar outflow elongated in the east-west direction with an expansion velocity of 69 +/- 11 km s(-1). WMC 1 and WMC 2 are associated with two 345 GHz continuum dust emission sources, which are located 2 '' (3600 AU) east from the core of an ultracompact H 11 region traced by 8.4 GHz radio continuum emission. This indicates that the star-formation activity of Onsala 1 could move from the west side of the ultracompact H it region to the east side of two young stellar objects associated with the water masers. We have also found that the WMC 1 and UC H II regions could be gravitationally bound. Their relative velocity along the line of sight is similar to 3 km s(-1), and the total mass is similar to 37M circle dot. Onsala I seems to harbor a binary star at a different evolutionary stage.
机译：我们介绍了在290天的三个时期内，日本VLBI网络观测到的水向着Onsala 1星形成区域的适当运动。我们发现有两个彼此分离为1''。6（2900AU的距离为1.8kpc）的水星团（WMC 1和WMC 2）。适当的运动测量表明，WMC I与东西向拉长的双极流出有关，膨胀速度为69 +/- 11 km s（-1）。 WMC 1和WMC 2与两个345 GHz连续性粉尘排放源相关联，它们位于由8.4 GHz无线电连续性发射追踪的超紧凑型H 11区域的核心以东2英寸（3600 AU）。这表明Onsala 1的恒星形成活动可能会从超紧凑型Hit区的西侧移动到与水激流有关的两个年轻恒星物体的东侧。我们还发现WMC 1和UC H II地区可能受到重力约束。它们沿视线的相对速度类似于3 km s（-1），总质量类似于37M圆点。恩萨拉（Insala）我似乎在另一个演化阶段拥有一颗双星。

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