Preliminar Determination of the Basal Chromospheric Emission for Late-Type Stars.
Abstract
We present a preliminar determinations of the basal emission for chromospheric very inactive dwarf and giant late type stars using data collected from the literature. We also derive the activity indeces SHK and RHK for about 550 solar type dwarf and giant using the 1Å, FWHM resolution spectra of the Indo-U.S. library. All the sample stars where in addition selected in the distance range 20< d <100 pc. The new fitting curves of the basal emission extend previous calibrations of the activity index RHK to the range \mbox{0.2< B-V <2.2 .
- Publication:
-
Memorie della Societa Astronomica Italiana Supplementi
- Pub Date:
- 2012
- Bibcode:
- 2012MSAIS..19..209T
- Keywords:
-
- Stars: activity of;
- Stars: chromospheres of;
- Stars: late-type