| タイトル | M dwarfs from the Einstein extended medium sensitivity survey |
| 著者（英） | Maccacaro, Tommaso; Gioia, Isabella M.; Fleming, Thomas A.; Liebert, James |
| 著者所属（英） | Harvard-Smithsonian Center for Astrophysics|Arizona Univ. |
| 発行日 | 1988-08-15 |
| 言語 | eng |
| 内容記述 | A complete sample of X-ray selected M dwarfs are presented which were serendipitously detected in the extended Einstein Observatory Medium Sensitivity Survey (MSS). The MSS detected only early M dwarfs (type MO through M5), 84 percent of which were emission stars (i.e., type Me V). It was calculated that the X-ray luminosity function for early M dwarfs with a log Lx greater than 27.6 and, by comparison to optical luminosity functions, find that about 25 percent of all early M dwarfs emit X-rays at a level greater than log Lx = 27.6. This result is compared to luminosity function estimates from optically selected samples and discussed in light of the sample's kinematic and mean age. Also presented is H alpha and Ca II K line fluxes for each member of the sample and it is shown that the surface H alpha and Ca II K luminosities do indeed correlate with Lx. The significance of this effect to theories of chromospheric and coronal heating is explained. |
| NASA分類 | ASTROPHYSICS |
| レポートNO | 88A49305 |
| 権利 | Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/369292 |
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