Other
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21931305m&link_type=abstract
American Astronomical Society, AAS Meeting #219, #313.05
Other
Scientific paper
Asteroseismology with the Kepler space telescope is providing not only an improved characterization of exoplanets and their host stars, but also a new window on stellar structure and evolution for the large sample of solar-type stars in the field. We perform a uniform analysis for 22 of the best and brightest asteroseismic targets observed for 1 month each during the first year of the mission, and we quantify the precision and accuracy of asteroseismic determinations of the stellar radius, mass, and age that are possible using various methods. We present the properties of each star in the sample derived from an automated analysis of the individual oscillation frequencies and other observational constraints using the Asteroseismic Modeling Portal (AMP), and we compare them to the results of model-grid-based methods that fit the global oscillation properties. We find that fitting the individual frequencies typically yields asteroseismic radii and masses to 1% precision (respectively 2 and 5 times better than fitting the global oscillation properties), and ages to 2.5% precision (nearly an order of magnitude improvement over grid-based methods). The absolute level of agreement between the results from different approaches is also encouraging, with model-grid-based methods yielding slightly smaller estimates of the radius and mass and slightly older values for the stellar age. The sample of targets for which this type of analysis is possible will grow as longer data sets are obtained during the remainder of the mission.
Mathur Savita
Metcalfe Travis Scott
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