Astrometry of H2O Masers in Nearby Star-Forming Regions with VERA III. IRAS22198+6336 in Lynds1204G-猫眼课题宝

DOI：

10.1093/pasj/60.5.961

发表时间：

2008-08

期刊：

Publications of the Astronomical Society of Japan

影响因子：

2.3

通讯作者：

中科院分区：

物理与天体物理4区

文献类型：

作者：

T. Hirota;K. Ando;T. Bushimata;Y. Choi;M. Honma;H. Imai;K. Iwadate;T. Jike;S. Kameno;O. Kameya;R. Kamohara;Y. Kan-ya;N. Kawaguchi;Masachika Kijima;Mi Kyoung Kim;H. Kobayashi;S. Kuji;T. Kurayama;S. Manabe;M. Matsui;N. Matsumoto;T. Miyaji;A. Miyazaki;T. Nagayama;A. Nakagawa;D. Namikawa;Daisuke Nyu;C. Oh;T. Omodaká;T. Oyama;S. Sakai;T. Sasao;Katsuhisa Sato;M. Sato;K. Shibata;Y. Tamura;K. Ueda;K. Yamashita

利用射电天体测量的VLBI探测技术（VERA），对L1204 G暗云中的年轻天体IRAS 22198+6336的22 GHz水脉泽进行了多历元VLBI观测。基于相位参考VLBI天体测量，我们推导出IRAS 22198+6336的年视差为1.309 stec 0.047 mas，相当于距离太阳764 stec 27 pc。虽然我们的天体测量的最主要的误差来源是由于脉泽斑点的内部结构，我们成功地减少了错误的推导出的年视差采用位置测量的所有26个检测到的脉泽斑点。在此基础上，我们重新分析了IRAS 22198+6336的光谱能量分布，发现测热光- -

We present results of multi-epoch VLBI observations with VERA (VLBI Exploration of Radio Astrometry) of the 22 GHz H2O 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 lumi— —

Astrometry of H2O Masers in Nearby Star-Forming Regions with VERA III. IRAS22198+6336 in Lynds1204G

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