| タイトル | X-ray studies of coeval star samples. III - X-ray emission in the Ursa Major stream |
| 著者（英） | Harnden, F. R., Jr.; Schmitt, J. H. M. M.; Micela, G.; Sciortino, S.; Vaiana, G. S. |
| 著者所属（英） | Osservatorio Astronomico|Max-Planck-Inst. fuer Extraterrestrische Physik|Harvard-Smithsonian Center for Astrophysics |
| 発行日 | 1990-03-10 |
| 言語 | eng |
| 内容記述 | Results are reported from a comprehensive survey of X-ray emission from stars known or suspected to be members of the UMa cluster and/or stream. Of the 42 UMa member stars surveyed, 18 were detected as X-ray sources, and spectral analysis was performed for 10 stars with sufficient X-ray counts. Consideration is given to relations between X-ray luminosity, color, and kinematics of the sample stars, and the X-ray spectra of the UMa stars are discussed in the context of the general problem of stellar X-ray temperatures. Also confirmed is the lack of X-ray-emitting A dwarfs among UMa members; among stars of later spectra type there is a rather large dispersion in X-ray luminosity. This dispersion cannot readily be explained by contamination with field star interlopers and appears rather to be a property of the UMa X-ray luminosity distribution function. |
| NASA分類 | ASTROPHYSICS |
| レポートNO | 90A25903 |
| 権利 | Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/357861 |
|
