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Sounding stellar cycles with Kepler – preliminary results from ground-based chromospheric activity measurements†

Published online by Cambridge University Press:  26 February 2010

C. Karoff ,
T. S. Metcalfe ,
W. J. Chaplin ,
S. Frandsen ,
F. Grundahl ,
H. Kjeldsen ,
D. Buzasi ,
T. Arentoft  and
J. Christensen-Dalsgaard
C. Karoff
Affiliation:
School of Physics and Astronomy, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK email: [email protected]
T. S. Metcalfe
Affiliation:
High Altitude Observatory and Scientific Computing Division, NCAR, PO Box 3000, Boulder, CO 80307, USA
W. J. Chaplin
Affiliation:
School of Physics and Astronomy, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK email: [email protected]
S. Frandsen
Affiliation:
Department of Physics and Astronomy, Aarhus University, DK-8000 Aarhus C, Denmark
F. Grundahl
Affiliation:
Department of Physics and Astronomy, Aarhus University, DK-8000 Aarhus C, Denmark
H. Kjeldsen
Affiliation:
Department of Physics and Astronomy, Aarhus University, DK-8000 Aarhus C, Denmark
D. Buzasi
Affiliation:
Eureka Scientific, Inc., 2452 Delmer Street Suite 100, Oakland, CA 94602, USA
T. Arentoft
Affiliation:
Department of Physics and Astronomy, Aarhus University, DK-8000 Aarhus C, Denmark
J. Christensen-Dalsgaard
Affiliation:
Department of Physics and Astronomy, Aarhus University, DK-8000 Aarhus C, Denmark
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Abstract

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Due to its unique long-term coverage and high photometric precision, observations from the Kepler asteroseismic investigation will provide us with the possibility to sound stellar cycles in a number of solar-type stars with asteroseismology. By comparing these measurements with conventional ground-based chromospheric activity measurements we might be able to increase our understanding of the relation between the chromospheric changes and the changes in the eigenmodes.

In parallel with the Kepler observations we have therefore started a programme at the Nordic Optical Telescope to observe and monitor chromospheric activity in the stars that are most likely to be selected for observations for the whole satellite mission. The ground-based observations presented here can be used both to guide the selection of the special Kepler targets and as the first step in a monitoring programme for stellar cycles. Also, the chromospheric activity measurements obtained from the ground-based observations can be compared with stellar parameters such as ages and rotation in order to improve stellar evolution models.

Keywords

Sun: activitySun: oscillationsstars: activitystars: oscillations
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 5 , Symposium S264: Solar and Stellar Variability: Impact on Earth and Planets , August 2009 , pp. 57 - 59
Copyright
Copyright © International Astronomical Union 2010

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