Astrometry of H2O masers in nearby star-forming regions with VERA - I. IRAS 16293-2422 in rho Oph East

作者：Imai Hiroshi^*; Nakashima Kohichiro; Bushimata Takeshi; Choi Yoon Kyung; Hirota Tomoya; Honma Mareki; Horiai Koji; Inomata Noritomo; Iwadate Kenzaburo; Jike Takaaki; Kameya Osamu; Kamohara Ryuichi; Kan Ya Yukitoshi; Kawaguchi Noriyuki; Kijima Masachika; Kobayashi Hideyuki; Kuji Seisuke; Kurayama Tomoharu; Manabe Seiji; Miyaji Takeshi; Nagayama Takumi; Nakagawa Akiharu; Oh Chung Sik; Omodaka Toshihiro; Oyama Tomoaki; Sakai Satoshi; Sakakibara Seiichiro; Sato Katsuhisa

来源：Publications of the Astronomical Society of Japan, 2007, 59(6): 1107-1113.

DOI：10.1093/pasj/59.6.1107

• astrometry
• masers
• stars : formation
• stars : individual (IRAS 16293-2422)
• ISM : jets and outflows

We report on results of multi-epoch VLBI observations of H2O masers associated with a low-mass young stellar object, IRAS 16293-2422 in rho Oph East, and a fringe-phase and position reference source, ICRF J162546.8-252738, using the VLBI Exploration of Radio Astrometry (VERA) for high-precision astrometry. We obtained an annual parallax of a maser feature to be pi = 5.6(-0.5)(+1.5) mas, corresponding to a distance of D = 178(-37)(+18) pc. We also found 10 relative proper motions of maser features with respect to the maser feature mentioned above. The motion of the accompanying young stellar object (YSO) has already been found in thermal continuum emission previously observed with the Very Large Array. The intrinsic motions of masers have been estimated from the relative proper motions after the YSO's motion is subtracted from, and a systemic secular motion of the position reference feature is added to the proper motions originally measured. The intrinsic maser kinematical structure may trace a bipolar outflow.

• 出版日期2007
• 单位中国科学院国家天文台