K2-Dwarf V471 TAU: a stellar version of solar variability
Technical Report
·
OSTI ID:6436183
Simultaneous observations of the rotational modulation with a 1/2 day period of chromospheric H alpha emission and of broadband irradiance for the K2-dwarf in V471 Tau are presented. The observations cover eight rotation periods but do not cover the full surface of the dwarf because of timing constraints. Preliminary results show a phase relation between enhanced chromospheric emission and continuum darkening similar to that observed on the Sun. A comparison with chromospheric Mg II resonance emission modulation observed about 2 1/4 years earlier by Guinan and Sion shows that the same active longitude is involved. This is either coincidental due to lucky phasing or it signifies a stable longitude that has persisted for hundreds of rotations.
- Research Organization:
- High Altitude Observatory, Boulder, CO (USA)
- OSTI ID:
- 6436183
- Report Number(s):
- N-84-27647
- Country of Publication:
- United States
- Language:
- English
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