The possible role of proton beams in flares on dwarf stars.
Abstract
The author has investigated the possible role of proton beams during flares on dwarf stars. Simultaneous observations of flares at optical and X-ray wavelengths indicate that a gradual phase is sometimes absent. This can be explained when ionization due to the beam energy deposition plays an important role. Two well observed optical/X-ray flares on BY Dra and on YZ CMi are discussed. It is shown that optical flares on dMe stars require energy deposition in the chromosphere by beams instead of by a conductive flux, in order to be consistent with the observations. The absence of correlation between optical flares and microwave emission can be explained if during flares the energy for the optical flare is carried to the chromosphere by proton beams.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- December 1988
- Bibcode:
- 1988A&A...207..101V
- Keywords:
-
- Dwarf Stars;
- Plasma Acceleration;
- Proton Beams;
- Stellar Flares;
- Stellar Physics;
- Temporal Distribution;
- Coronal Loops;
- Exosat Satellite;
- M Stars;
- Solar Flares;
- Stellar Spectra;
- X Ray Spectra;
- Astrophysics