OBSERVATIONAL STUDIES OF THE PROCESS OF MASS OUTFLOW IN LATE TYPE STARS

本研究的目的是通过数年对水脉仪的监测观测，研究晚型恒星质量外流的机理。为此，我们利用国内VLBI网络J Net对IRC60169、VX Sgr、R Crt等3颗晚型恒星进行了观测。对IRC60169和R Crt的数据进行了分析。我们发现了水激波点的寿命和固有运动的新结果。我们已经写了一篇关于R Crt结果的论文。很快就会提交。对于IRC60169和VX Sgr的数据，我们现在正在进行分析。同时，利用鹿儿岛6米望远镜继续对水激源进行单碟监测观测。这些结果和数据对今年开始的VERA项目是有利的。在这些观测中，我们使用6m望远镜在猎户座KL的水蒸气脉泽发射中发现了一个壮观的耀斑。耀斑的强度继续呈指数增长，其通量密度大于4x106 Jy，研究结果已经发表。我们还尝试用UBA对该耀斑进行VLBI监测观测。对数据进行了分析，发现了非常有趣的结果。我们现在正在准备这些结果的手稿。对晚型恒星发射的光学和红外辐射的观测没有取得显著进展。然而，新构造的红外摄像机显示出较高的稳定性。从今年4月起，我们开始进行红外观测。

The purpose of this research is to study the mechanism of mass outflow from late type stars by doing monitoring observations of water masers during several years. For this, we have observed three late type stars, such as IRC60169, VX Sgr, R Crt, by using domestic VLBI network called J Net. The data of IRC60169 and R Crt were already analyzed. We have found the new results on the life time and proper motions of water maser spots. We have already written a paper for the result of R Crt. It will be submitted soon. For the data of both IRC60169 and VX Sgr, we are now analyzing. Also we have continued the single dish monitoring observations of water maser sources by using 6m telescope at Kagoshima. These results and data are favorable for the VERA project which will start from this year.During these observations, we have discovered a spectacular flare in the water-vapor maser emission from the Orion KL by using 6m telescope. The flare continued to increase in intensity exponentially and had a flux density greater than 4x106 Jy. The results were already published. We also tried to VLBI monitoring observations of this flare by using UBA. The data were already analyzed and very interesting results are found. We are now preparing manuscript on these results. The observation of optical and infrared radiation emitted from late type stars does not make a prominent progress. However the new constructed infrared camera shows a high stability. From this April we started infrared observations.