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Title:
Sounding stellar cycles with Kepler - preliminary results from ground-based chromospheric activity measurements†
Authors:
Karoff, C.; Metcalfe, T. S.; Chaplin, W. J.; Frandsen, S.; Grundahl, F.; Kjeldsen, H.; Buzasi, D.; Arentoft, T.; Christensen-Dalsgaard, J.
Affiliation:
AA(School of Physics and Astronomy, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK ), AB(High Altitude Observatory and Scientific Computing Division, NCAR, PO Box 3000, Boulder, CO 80307, USA), AC(School of Physics and Astronomy, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK ), AD(Department of Physics and Astronomy, Aarhus University, DK-8000 Aarhus C, Denmark), AE(Department of Physics and Astronomy, Aarhus University, DK-8000 Aarhus C, Denmark), AF(Department of Physics and Astronomy, Aarhus University, DK-8000 Aarhus C, Denmark), AG(Eureka Scientific, Inc., 2452 Delmer Street Suite 100, Oakland, CA 94602, USA), AH(Department of Physics and Astronomy, Aarhus University, DK-8000 Aarhus C, Denmark), AI(Department of Physics and Astronomy, Aarhus University, DK-8000 Aarhus C, Denmark)
Publication:
Solar and Stellar Variability: Impact on Earth and Planets, Proceedings of the International Astronomical Union, IAU Symposium, Volume 264, p. 57-59
Publication Date:
02/2010
Origin:
CUP
Keywords:
Sun: activity, Sun: oscillations, stars: activity, stars: oscillations
DOI:
10.1017/S1743921309992353
Bibliographic Code:
2010IAUS..264...57K

Abstract

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.


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