H-alpha versus X-ray luminosity in dwarf M stars.
Abstract
A power-law correlation is presented between the excess chromospheric H-alpha emission and the coronal X-ray emission for a group of dM and dMe stars. This excess emission was calculated by subtracting the maximum (i.e., saturated) observed H-alpha absorption equivalent width for a star of a similar color. Heating of the chromosphere through X-ray back-heating is not the dominant component of chromospheric heating in dM stars, although in the very active late-type stars its contribution could be about 50 percent.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- July 1989
- Bibcode:
- 1989A&A...218..195D
- Keywords:
-
- Dwarf Stars;
- H Alpha Line;
- M Stars;
- Stellar Luminosity;
- X Ray Stars;
- Absorption Spectra;
- Chromosphere;
- Late Stars;
- Stellar Coronas;
- Astrophysics