Spectroscopic rotational modulation associated with chromospheric active structures.
Abstract
Several active late-type dwarfs have been monitored along their rotational period to study the spectroscopic variability in the main chromospheric lines. The authors analyse the Ca II H index and profile modulation of 20% for α Cen B in terms of solar-like components of activity (analogous to the quiet network and plage on the Sun). A simulation of the Ca II H spectra of α Cen B based on multicomponent features is shown, allowing to estimate the performance of methods deriving the signature of stellar chromospheric plages from flux, velocity and asymmetry modulation diagnostics.
- Publication:
-
Modeling the Stellar Environment: How and Why?
- Pub Date:
- 1989
- Bibcode:
- 1989mse..proc..211C
- Keywords:
-
- Astronomical Spectroscopy;
- Chromosphere;
- Dwarf Stars;
- Late Stars;
- Stellar Activity;
- Stellar Rotation;
- Calcium;
- Centaurus Constellation;
- Plasma Diagnostics;
- Stellar Flares;
- Variable Stars;
- Astrophysics;
- Stellar Activity: Late-Type Dwarfs;
- Stellar Chromospheres: Late-Type Stars