RS CVn stars - Chromospheric phenomena
Abstract
The observational information regarding chromospheric emission features in surface-active RS CVn stars is reviewed. Three optical features are considered in detail: Ca II H and K, Balmer H-alpha and He I 10830 A. While the qualitative behavior of these lines is in accord with solar-analogy/rotation-activity ideas, the quantitative variation and scaling are very poorly understood. In many cases, the spectroscopic observations with sufficient SNR and resolution to decide these questions have simply not yet been made. The FK Com stars, in particular, present extreme examples of rotation that may well tax present understanding of surface activity to its limits.
- Publication:
-
IAU Colloq. 71: Activity in Red-Dwarf Stars
- Pub Date:
- 1983
- DOI:
- 10.1007/978-94-009-7157-8_43
- Bibcode:
- 1983ASSL..102..363B
- Keywords:
-
- Chromosphere;
- Eclipsing Binary Stars;
- H Lines;
- K Lines;
- Stellar Flares;
- Stellar Spectra;
- Balmer Series;
- Giant Stars;
- H Alpha Line;
- Infrared Absorption;
- Stellar Rotation;
- Variable Stars;
- Astrophysics