2011 Fiscal Year Final Research Report
An observational study on infrared stars using space telescope data
| Project/Area Number |
21740142
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Astronomy
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| Research Institution | Tohoku University (2010-2011)
National Astronomical Observatory of Japan (2009) |
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Principal Investigator |
ITA Yoshifusa 東北大学, 大学院・理学研究科, 助教 (30392814)
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| Project Period (FY) |
2009 – 2011
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| Keywords | 光学赤外線天文学 / 恒星物理学 |
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| Research Abstract |
Using data obtained by Japanese Infrared Satellite AKARI, and Spitzer space telescope launched by NASA, we studied the period-luminosity(PL)relations and circumstellar extinction law of the Mira-like variables in the Large Magellanic Cloud. We discovered following things :(1)the PL relations have a kink, and the period at which the break occurs is about 450 days,(2)circumstellar extinction law of short period Mira-like variables differs very much from that of interstellar extinction law and the circumstellar extinction law gets similar to the interstellar extinction law with increasing pulsation periods. relations have a kink, and the period at which the break occurs is about 450 days,(2)circumstellar extinction law of short period Mira-like variables differs very much from that of interstellar extinction law and the circumstellar extinction law gets similar to the interstellar extinction law with increasing pulsation periods.
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