Development of optical/near infrared camera and long-term monitoring of target sources for VERA

VERA是日本国家天文台与鹿儿岛大学合作推动的新建造的VLBI阵列。VERA的目标是测量与银河系中恒星形成区域和米拉贵重物品相关的脉泽源的视差。由于脉泽源具有很高的价值，为了更有效地进行长期VLBI观测，监测它们的强度是很重要的。为此，我们计划开发一台1米光学/近红外望远镜来监测VERA的目标源。此外，我们计划利用VERA的6米单盘射电望远镜和20米天线对VERA观测到的脉泽源进行测量和监测观测。在我们的项目中，我们证实了VERA的双波束相位校准系统是使用相位参考观测的有力工具(Honma等人)。2003年)。利用该系统，我们已经开始与VERA进行长期的VLBI监测观测。部分成果在国内和国际会议上发表。此外，我们还利用VERA的6米射电望远镜和20米天线作为单碟式射电望远镜，开始了对数百个脉泽源的测量和监测观测。我们正在建设脉泽源数据库，并将在不久的将来公布。另一方面，我们已经开发了一台1M光学/近红外望远镜，并开始对米拉贵重物品进行监测观测。在我们的调查观察中，我们发现了几件未知的米拉贵重物品。为了准确地确定它们的周期，我们计划继续进行进一步的长期监测观测。

VERA is a newly constructed VLBI array promoted by National Astronomical Observatory of Japan in collaboration with Kagoshima University. VERA aims to measure the parallaxes of maser sources associated with star-forming regions and Mira valuables in the Galaxy. Because maser sources are highly valuable, it is important to monitor their intensities in order to carry out long-term VLBI observations more efficiently. For the purpose of this, we planned to develop a 1m optical/near infrared telescope to monitor the target sources for VERA. In addition, we planned to carry out survey and monitoring observations of maser sources observed with VERA with the 6m single-dish radio telescope and 20 m antenna of VERA.In our project, we confirmed that dual-beam phase calibration system of VERA is a powerful tool to use phase-referencing observations (Honma et al. 2003). Using this system, we have started to carry out long-term VLBI monitoring observations with VERA. Some of the results are presented in domestic and international conferences. In addition, we have started survey and monitoring observations of a few hundreds of maser sources using the 6m radio telescope and 20m antenna of VERA as a single-dish radio telescope. We are now constructing database of the maser sources and it will be published near future.On the other hand, we have developed a 1m optical/near infrared telescope and also started to carry out monitoring observations of Mira valuables. We found several unknown Mira valuables in our survey observations. In order to determine their period accurately, we are planning to continue further long-term monitoring observations.