Are tides responsible for enhanced MG II emission in late-type binaries ?
Abstract
Mg II h and k fluxes are measured for a homogeneous sample of 30 G III and K III binaries. The spectra have been obtained from the IUE archive and calibrated in absolute units (erg cm-2s-1). Contrary to the generally accepted view that the rate of rotation is responsible for the enhanced chromospheric activity, the Mg II h and k fluxes correlate much better with parameters containing the separation of components in binary systems. It is suggested that the enhanced chromospheric emission in late-type giant binary systems is due to tides rather than to rotational velocities.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- January 1988
- Bibcode:
- 1988A&A...189..199G
- Keywords:
-
- Binary Stars;
- Chromosphere;
- Late Stars;
- Magnesium;
- Stellar Magnetic Fields;
- Stellar Spectra;
- Tides;
- Bolometers;
- Emission Spectra;
- G Stars;
- K Stars;
- Astrophysics