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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >Astrometry of H_2O Masers in Nearby Star-Forming Regions with VERA III.IRAS 22198+6336 in Lynds 1204 G
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Astrometry of H_2O Masers in Nearby Star-Forming Regions with VERA III.IRAS 22198+6336 in Lynds 1204 G

机译：利用VERA III.IRAS 22198 + 6336 in Lynds 1204 G在附近恒星形成区中的H_2O Masers的星象学

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摘要

We present results of multi-epoch VLBI observations with VERA (VLBI Exploration of Radio Astrometry) of the 22 GHz H_2O masers associated with a young stellar object (YSO) IRAS 22198+6336 in a dark cloud, L 1204 G. Based on phase-referencing VLBI astrometry, we derived an annual parallax of IRAS 22198+6336 to be 1.309 ± 0.047 mas, corresponding to the distance of 764 ± 27 pc from the Sun. Although the most principal error source of our astrometry is attributed to the internal structure of the maser spots, we successfully reduced the errors in the derived annual parallax by employing position measurements for all of the 26 detected maser spots. Based on this result, we reanalyzed the spectral energy distribution of IRAS 22198+6336 and found that the bolometric luminosity and total mass of IRAS 22198+6336 are 450 L_⊙ and 7 M_⊙, respectively. These values are consistent with an intermediate-mass YSO deeply embedded in the dense dust core, which has been proposed to be an intermediatemass counterpart of a low-mass Class 0 source. In addition, we obtained absolute proper motions of the H_2O masers for the most blue-shifted components. We propose that the collimated jets aligned along the east-west direction are the most plausible explanation for the origin of the detected maser features.
机译：我们介绍了在暗云L 1204 G中与年轻恒星物体（YSO）IRAS 22198 + 6336相关联的22 GHz H_2O脉象的VERA（射电占星术的VLBI探索）的多历时VLBI观测结果。参考VLBI天文测量法，我们得出IRAS 22198 + 6336的年视差为1.309±0.047 mas，对应于距太阳的764±27 pc距离。尽管我们的天文测量法最主要的误差源归因于maser点的内部结构，但我们通过对所有26个探测到的maser点进行位置测量，成功地减少了导出的年视差中的误差。基于此结果，我们重新分析了IRAS 22198 + 6336的光谱能量分布，发现IRAS 22198 + 6336的辐射热亮度和总质量分别为450L_⊙和7M_⊙。这些值与深埋在致密压粉磁芯中的中等质量YSO一致，后者已被提议作为低质量0类源的中等质量对应物。另外，我们获得了最蓝移的分量的H_2O脉搏的绝对正确运动。我们认为，沿东西方向排列的准直射流是探测到的主波特征的起源的最合理的解释。

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