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The dependence of maximum starspot amplitude and the amplitude distribution on stellar properties

Published online by Cambridge University Press:  26 August 2011

Steven H. Saar ,
Michelle Dyke ,
Søren Meibom  and
Sydney A. Barnes
Steven H. Saar
Affiliation:
Smithsonian Astrophysical Obs., 60 Garden Street, Cambridge, MA 02138, USA email: saar@cfa.harvard.edu, smeibom@cfa.harvard.edu
Michelle Dyke
Affiliation:
Smithsonian Astrophysical Obs., 60 Garden Street, Cambridge, MA 02138, USA email: saar@cfa.harvard.edu, smeibom@cfa.harvard.edu Yale Univ. New Haven, CTUSA
Søren Meibom
Affiliation:
Smithsonian Astrophysical Obs., 60 Garden Street, Cambridge, MA 02138, USA email: saar@cfa.harvard.edu, smeibom@cfa.harvard.edu
Sydney A. Barnes
Affiliation:
Lowell Obs., 1400 W. Mars Hill Road, Flagstaff, AZ 86011 email: barnes@lowell.edu
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Abstract

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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.

Keywords

Stars: spotsstars: rotationstars: magnetic fieldsstars: late-typestars: evolution
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 6 , Symposium S273: The Physics of Sun and Star Spots , August 2010 , pp. 469 - 473
Copyright
Copyright © International Astronomical Union 2011

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