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Sounding stellar cycles with Kepler – II. Ground-based observations★

Title: Sounding stellar cycles with Kepler – II. Ground-based observations★.
Name(s): Karoff, C., author
Metcalfe, T. S., author
Chaplin, W. J., author
Frandsen, S., author
Grundahl, F., author
Kjeldsen, H., author
Christensen-Dalsgaard, J., author
Nielsen, M. B., author
Frimann, S., author
Thygesen, A. O., author
Arentoft, T., author
Amby, T. M., author
Sousa, S. G., author
Buzasi, D. L., author
Type of Resource: text
Genre: Article
Date Issued: 2013-06-22
Abstract: We have monitored 20 Sun-like stars in the Kepler field-of-view for excess flux with the FIES spectrograph on the Nordic Optical Telescope since the launch of Kepler spacecraft in 2009. These 20 stars were selected based on their asteroseismic properties to sample the parameter space (effective temperature, surface gravity, activity level etc.) around the Sun. Though the ultimate goal is to improve stellar dynamo mod- els, we focus the present paper on the combination of space-based and ground-based observations can be used to test the age-rotation-activity relations. In this paper we describe the considerations behind the selection of these 20 Sun- like stars and present an initial asteroseismic analysis, which includes stellar age es- timates. We also describe the observations from the Nordic Optical Telescope and present mean values of measured excess fluxes. These measurements are combined with estimates of the rotation periods obtained from a simple analysis of the modula- tion in photometric observations from Kepler caused by starspots, and asteroseismic determinations of stellar ages, to test relations between between age, rotation and activity.
Identifier: 10.1093/mnras/stt964 (doi), fgcu_ir_000068 (IID), (uri)
Subject(s): activity
Persistent Link to This Record:
Use and Reproduction: publisher
Owner Institution: FGCU
Is Part Of: Monthly Notices of the Royal Astronomical Society.