| Project/Area Number |
26800096
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Astronomy
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| Research Institution | National Astronomical Observatory of Japan |
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Principal Investigator |
Maehara Hiroyuki 国立天文台, 岡山天体物理観測所, 専門研究職員 (40456851)
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| Research Collaborator |
Shibata Kazunari 京都大学, 大学院理学研究科, 教授 (70144178)
Nogami Daisaku 京都大学, 大学院理学研究科, 准教授 (20332728)
Honda Satoshi 兵庫県立大学, 天文科学センター, 特任助教 (20425408)
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| Project Period (FY) |
2014-04-01 – 2017-03-31
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| Project Status |
Completed (Fiscal Year 2016)
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| Budget Amount *help |
¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2016: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2015: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2014: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
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| Keywords | 恒星フレア / 光赤外線天文学 / 恒星物理学 / 恒星黒点 / 太陽型星 / 黒点 / スーパーフレア / フレア |
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| Outline of Final Research Achievements |
Previous studies by using the data from Kepler suggest that a part of solar-type stars with the rotation period comparable to the Sun (~25 days) show much higher magnetic activity (e.g., superflares). We studied the rotation period distribution of the solar-type stars with high X-ray luminosity from grand-based photometric and spectroscopic observations. We found that some of active solar-type stars have the rotation velocity of < 5 km/s.
We also studied the statistical properties of superflares on active solar-type stars by using the Kepler 1-min cadence data. We found a clear correlation between the duration of flares and the energy released by flares. This correlation can be explained if we assume that flares are caused by the magnetic reconnection.
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