| タイトル | Long and short timescale variability of magnetic activity on the BY Dra star BD+26 deg 730 |
| 著者（英） | Saar, S. H.; Golub, L.; Herbst, W.; Bopp, B.; Huovelin, J. |
| 著者所属（英） | Harvard-Smithsonian Center for Astrophysics |
| 発行日 | 1990-08-01 |
| 言語 | eng |
| 内容記述 | BD+26 degree 730 is a very active K5V flare star with a 60 year starspot cycle. Since it is also nearly pole-on, it presents an unusual opportunity to study purely temporal evolution of magnetic activity. Contemporaneous International Ultraviolet Explorer (IUE), magnetic flux, polarimetric, and H alpha observations of the star taken over several rotational periods in 1988 are presented. When combined with older photometry, optical and IUE archive spectra, the data show a surprising lack of any activity variability on either short (few days) or long (years) timescales. The lack of variability is suggested to be due to a nearly saturated level of magnetic activity on the star, as indicated by its large magnetic filling factor. |
| NASA分類 | ASTROPHYSICS |
| レポートNO | 91N17941 |
| 権利 | Copyright, Distribution within the U.S. granted by agreement |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/232430 |
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