| タイトル | Chromospheric Activity in Population II Giants |
| 著者（英） | Harper, Graham M. |
| 著者所属（英） | Colorado Univ. |
| 発行日 | 2004-08-01 |
| 言語 | eng |
| 内容記述 | One of the mysteries of Population II giants is that they still show chromospheric emission despite their great age. The global dynamo which was active during their main-sequence lifetimes is expected to become extremely weak through magnetic rotational braking. The nature of the observed emission is not understood; although acoustic shock waves might provide the heating, acoustic waves are not predicted to drive the observed mass loss - which in turn requires the dissipation of magneto-hydrodynamic waves. This program was designed to search for the faint stellar H Ly beta emission wings and the fluorescent Fe II and H2 emission from one of the brightest, metal poor, Population II stars. These FUSE diagnostics, when combined with existing UV and optical spectra, help determine the major radiative cooling channels for the chromosphere. This observation was to complement that previously planned for the mildly metal deficient giant alpha Boo (K2 III). However, alpha Boo has yet to be observed with FUSE. |
| NASA分類 | Astronomy |
| レポートNO | CU-1535515 |
| 権利 | No Copyright |
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