| Project/Area Number |
20540234
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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 | Kagoshima University |
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Principal Investigator |
IMAI Hiroshi Kagoshima University, 理工学研究科(理学系), 准教授 (70374155)
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| Co-Investigator(Kenkyū-buntansha) |
DEGUCHI Shuji 国立天文台, 野辺山宇宙電波観測所, 准教授 (20197825)
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| Co-Investigator(Renkei-kenkyūsha) |
HIROTA Tomoya 国立天文台, 水沢VLBI観測所, 助教 (10325764)
HONMA Mareki 国立天文台, 水沢VLBI観測所, 准教授 (20332166)
NAKAGAWA Akiharu 鹿児島大学, 理工学研究科(理学系), 助教 (60535631)
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| Research Collaborator |
NAKASHIMA Jun-ichi 香港大学, 理学部, 助理教授
KWOK Sun 港大学, 理学部, 教授
HE Jin-Hua 雲南天文台(中国), 研究員
DIAMOND Philip J. Commonwealth Scientific and Industrial Research Organisation (オーストラリア), 教授
UKITA Nobuharu 国立天文台, 光赤外研究部, 准教授
SAKAI Tsuyoshi 東京大学, 天文教育研究センター, プロジェクト助教
TAFOYA Daniel 鹿児島大学, 大学院・理工学研究科, 日本学術振興会外国人研究員
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| Project Period (FY) |
2008 – 2010
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| Project Status |
Completed (Fiscal Year 2010)
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| Budget Amount *help |
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2010: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2009: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2008: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
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| Keywords | 電波天文学 / 宇宙メーザー / 近巨星枝星 / 老星ジェット / 超長基線電波干渉法 / 年周視差計測 / 漸近巨星枝星 / サブミリー酸化炭素輝線 |
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| Research Abstract |
We have studied the "water fountain" sources that exhibit bipolar fast jets traced by water vapor maser emission and associated with evolved star. We found a "helix" pattern of jet from one the water fountains and obtained its annual parallax distance. In another source, we found high velocity components of carbon-monoxide emission and an extremely low ^<12>CO/^<13>CO intensity ratio. These results suggest that the parental stars of the water fountains should be intermediate-mass (2-8 solar masses) stars and the jets should play a major role to shape planetary nebulae.
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