Trigonometric Parallaxes of Massive Star Forming Regions: G012.88+0.48 and W33
Trigonometric Parallaxes of Massive Star Forming Regions: G012.88+0.48 and W33
复制标题
DOI：
10.1051/0004-6361/201220793
复制
发表时间：
2013-04
影响因子：
6.5
通讯作者：
K. Immer;M. Reid;K. Menten;A. Brunthaler;T. Dame
中科院分区：
文献类型：
--
作者：
K. Immer;M. Reid;K. Menten;A. Brunthaler;T. Dame
我们报告了利用甚长基线阵列进行的棒旋结构遗产（BeSSeL）巡天中G012.88+0.48区域和大质量星星形成复合体W33（包含G012.68 - 0.18，G012.81 - 0.19，G012.90 - 0.24，G012.90 - 0.26）中水脉泽的三角散射。所有这些脉泽的视差距离都是2.40 + 0.17 −0.15 kpc，这将W33复合体和G012.88+0.48定位在盾牌座螺旋臂中。我们的结果表明，W33是一个单颗星星，在大约三分之二的运动学距离3.7 kpc处形成复合体。因此，基于运动学距离的这个区域的光度和质量被高估了两倍以上。W33 Main中的星星团的光谱类型必须改变1.5个点才能变成更晚的类型。
We report trigonometric parallaxes for water masers in the G012.88+0.48 region and in the massive star forming complex W33 (containing G012.68‐0.18, G012.81‐0.19, G012.90‐0.24, G012.90‐0.26), from the Bar and Spiral Structure Legacy (BeSSeL) survey using the Very Long Baseline Array. The parallax distances to all these masers are consistent with 2.40 +0.17 −0.15 kpc, which locates the W33 complex and G012.88+0.48 in the Scutum spiral arm. Our results show that W33 is a single star forming complex at about two-thirds the kinematic distance of 3.7 kpc. The luminosity and mass of this region, based on the kinematic distance, have therefore been overestimated by more than a factor of two. The spectral types in the star cluster in W33 Main have to be changed by 1.5 points to later types.