| Project/Area Number |
13640242
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Astronomy
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| Research Institution | National Astronomical Observatory of Japan (2003)
Kagoshima University (2001-2002) |
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Principal Investigator |
HIROTA Tomoya National Astronomical Observatory of Japan, Division of Earth rotation, Research associate, 地球回転研究系, 助手 (10325764)
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| Co-Investigator(Kenkyū-buntansha) |
OMODAKA Toshihiro Kagoshima University, Department of Physics, Faculty of Science, Professor, 理学部, 教授 (50129285)
NISHIO Masanori Kagoshima University, Department of Physics, Faculty of Science, Associate Professor, 理学部, 助教授 (70135383)
KAROJI Hiroshi National Astronomical Observatory of Japan, Subaru Telescope, Professor, ハワイ観測所, 教授 (30221196)
TANAKA Masuo University of Tokyo, Institute of Astronomy Faculty of Science, Associate Professor, 大学院・理学系研究科, 助教授 (70188340)
KOBAYASHI Hideyuki National Astronomical Observatory of Japan, Division of Earth rotation, Professor, 地球回転研究系, 教授 (20211906)
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| Project Period (FY) |
2001 – 2003
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| Project Status |
Completed (Fiscal Year 2003)
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| Budget Amount *help |
¥3,700,000 (Direct Cost: ¥3,700,000)
Fiscal Year 2003: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 2002: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 2001: ¥2,600,000 (Direct Cost: ¥2,600,000)
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| Keywords | Optical / NIR astronomy / Radio Astronomy / VLBI / Mira-type valuable stars / Period-Luminosity relation / Star-forming regions / Maser / Distance measurements |
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| Research Abstract |
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.
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