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Starspot variability and evolution from modeling Kepler photometry of active late-type stars

Published online by Cambridge University Press:  26 August 2011

Alexander Brown ,
Heidi Korhonen ,
Svetlana Berdyugina ,
Barton Tofany ,
Thomas R. Ayres ,
Adam Kowalski ,
Suzanne Hawley ,
Graham Harper  and
Nikolai Piskunov
Alexander Brown
Affiliation:
Center for Astrophysics and Space Astronomy, University of Colorado, Boulder, CO 80309-0593, USA email: Alexander.Brown@colorado.edu, Barton.Tofany@colorado.edu, Thomas.Ayres@@colorado.edu
Heidi Korhonen
Affiliation:
European Southern Observatoty, Garching, Germanyhkorhon@eso.org
Svetlana Berdyugina
Affiliation:
KIS, Freiburg, Germanysveta@kis.uni-freiburg.de
Barton Tofany
Affiliation:
Center for Astrophysics and Space Astronomy, University of Colorado, Boulder, CO 80309-0593, USA email: Alexander.Brown@colorado.edu, Barton.Tofany@colorado.edu, Thomas.Ayres@@colorado.edu
Thomas R. Ayres
Affiliation:
Center for Astrophysics and Space Astronomy, University of Colorado, Boulder, CO 80309-0593, USA email: Alexander.Brown@colorado.edu, Barton.Tofany@colorado.edu, Thomas.Ayres@@colorado.edu
Adam Kowalski
Affiliation:
University of Washington, Seattle, WA, USAkowalski@astro.washington.edu, slh@astro.washington.edu
Suzanne Hawley
Affiliation:
University of Washington, Seattle, WA, USAkowalski@astro.washington.edu, slh@astro.washington.edu
Graham Harper
Affiliation:
Trinity College Dublin, Dublin, Irelandgraham.harper@tcd.ie
Nikolai Piskunov
Affiliation:
Dept. of Astronomy & Space Physics, Uppsala University, Box 515, SE-75120 Uppsala, Sweden email: piskunov@astro.uu.se
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Abstract

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The Kepler satellite provides a unique opportunity to study the detailed optical photometric variability of late-type stars with unprecedentedly long (several year) continuous monitoring and sensitivity to very small-scale variations. We are studying a sample of over two hundred cool (mid-A - late-K spectral type) stars using Kepler long-cadence (30 minute sampling) observations. These stars show a remarkable range of photometric variability, but in this paper we concentrate on rotational modulation due to starspots and flaring. Modulation at the 0.1% level is readily discernable. We highlight the rapid timescales of starspot evolution seen on solar-like stars with rotational periods between 2 and 7 days.

Keywords

Stars:spotsstars:activitystars:rotationstars: late-type
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 6 , Symposium S273: The Physics of Sun and Star Spots , August 2010 , pp. 78 - 82
Copyright
Copyright © International Astronomical Union 2011

References

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