Activity in late-type stars. VII. Chromospheric and transition region line fluxes in 2 dM and dM(e) stars.
Abstract
Ultraviolet spectra of the two dM stars Gl380 and Gl411 and the dM(e) Gl900 are presented. The dM stars show mean surface fluxes in a variety of emission lines arising throughout the chromosphere and the lower transition region which are very similar to those of the quiet sun. In the one star in which it could be determined the electron density at log T(e) was roughly 4.75, also within a factor of roughly 2.5 that of the solar value. Results for a single dM(e) star indicate higher mean surface fluxes in these same lines, consistent with the view that they are intermediate between the dM and the dMe stars.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- November 1990
- Bibcode:
- 1990A&A...238..221B
- Keywords:
-
- Chromosphere;
- Dwarf Stars;
- Late Stars;
- M Stars;
- Stellar Activity;
- Emission Spectra;
- Iue;
- Lyman Alpha Radiation;
- Stellar Atmospheres;
- Ultraviolet Spectra;
- Astrophysics