2009 Fiscal Year Final Research Report
Detection of long-term variability of stars with historical records on astronomy
| Project/Area Number |
20840034
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| Research Category |
Grant-in-Aid for Young Scientists (Start-up)
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| Allocation Type | Single-year Grants |
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| Research Field |
Astronomy
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| Research Institution | Kyushu University |
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Principal Investigator |
FUJIWARA Tomoko Kyushu University, 高等教育開発推進センター, 助教 (50467875)
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| Project Period (FY) |
2008 – 2009
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| Keywords | 恒星進化 / 変光星 / 突発現象 / 歴史的天文記録 |
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| Research Abstract |
In order to detect long-term variability of stars, we investigated surviving historical documents on astronomy and sampled observational data. First, we analysed stellar coordinates (ecliptic and equatorial) to identify and know observational errors. As for star charts, it was difficult to compare with modern observational results because of their non-numerical data and lack of the method of projection and we could not know their accuracy. Although some star catalogues includes misprints, unknown objects could be detected and they might be unknown variable stars or transient objects like supernovae, novae and comets. Second, we compared stellar magnitudes recorded in each documents and detected long-term (about several hundred years) variability.
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