Computer Science
Scientific paper
May 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984siva.work..185s&link_type=abstract
In NASA, Washington Solar Irradiance Variations on Active Region Time Scales p 185-196 (SEE N84-27635 17-92)
Computer Science
1
Dwarf Stars, Eclipsing Binary Stars, Light Curve, Solar Flux Density, Stellar Activity, Variable Stars, Chromosphere, H Alpha Line, Light Modulation, Stellar Rotation, Stellar Spectra
Scientific paper
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.
Skumanich Andrew
Young Alex
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