Astronomy and Astrophysics – Astronomy
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21822704n&link_type=abstract
American Astronomical Society, AAS Meeting #218, #227.04; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
We have observed about 200 targets in Kepler Cycle 1/2 Guest Observer programs. The sample of active star candidates was selected primarily using GALEX colors, and the Kepler light curves have revealed a rich variety of variability. Rotational modulation (typical periods a few days) due to starspots over the multi-year timeline of the Kepler observations will permit us to measure surface differential rotation and stellar magnetic cycles. On shorter timescales, the Kepler data show dramatic evidence of stellar pulsations across much of the HR diagram. Our selection criteria yielded a sample of magnetically active G and K dwarfs, which might show solar-like pulsations. It also yielded subsamples of several well-known pulsators (e.g., Delta Scuti stars) as well as pulsators that currently defy easy classification. We are systematically classifying and analyzing the pulsating stars in the our Kepler GO program. We are particularly interested in using pulsations to probe the interior properties of active G and K dwarfs, while the starspots serve as a probe of the convection zone and surface layers. We will present summary results for several different types of pulsation, and we will provide a detailed asteroseismic analysis of those stars in our sample that were observed to have both pulsations and magnetic activity.
This work contains results obtained using the NASA Kepler satellite and from the Apache Point Observatory, the MMT (using NOAO community access time), and the Hobby-Eberly Telescope. Funding is provided by NASA Kepler grants NNX10AC51G and NNX11AC79G.
Brown Adrian
Hawley Scott
Kowalski Adam
Neff James E.
Saar Steve
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