Physics
Scientific paper
Aug 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011iaus..273..469s&link_type=abstract
The Physics of Sun and Star Spots, Proceedings of the International Astronomical Union, IAU Symposium, Volume 273, p. 469-473
Physics
Stars: Spots, Stars: Rotation, Stars: Magnetic Fields, Stars: Late-Type, Stars: Evolution
Scientific paper
We combine photometric data from field stars, plus over a dozen open clusters and associations, to explore how the maximum photometric amplitude (Amax) and the distribution of amplitudes varies with stellar properties. We find a complex variation of Amax with inverse Rossby number Ro-1, which nevertheless can be modeled well with a simple model including an increase in Amax with rotation for low Ro-1, and a maximum level. Amax may then be further affected by differential rotation and a decline at the highest Ro-1. The distribution of Aspot below Amax varies with Ro-1 : it peaks at low Aspot with a long tail towards Amax for low Ro-1, but is more uniformly distributed at higher Ro-1. We investigate further dependences of the Aspot distributions on stellar properties, and speculate on the source of these variations.
Barnes Sydney A.
Dyke Michelle
Meibom Søren
Saar Steven H.
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