Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21934802j&link_type=abstract
American Astronomical Society, AAS Meeting #219, #348.02
Astronomy and Astrophysics
Astronomy
Scientific paper
Using the catalog of the All-Sky American Survey (ASAS) variable stars in the Kepler Field, we analyzed Kepler light curves from quarters 0, 1, and 2 using the NASA Star and Exoplanet Database (NStED) periodogram service and determined periods and amplitudes for the 777 variables we could access. The ASAS periods agree very well to the periods determined from the Kepler data except for semiregular variables. This is due to roughly a week-long interval between ASAS observations. With a higher observing frequency, these stars are much better characterized. We investigated the quality of the NStED service period determinations by comparing periods of the ASAS eclipsing binaries to the periods determined for them by Slawson et al. We determined that NStED determines similar periods to Slawson et al. for well-defined eclipsing binaries with sharply peaked periodograms, but when the main peak of the periodogram is broad there is greater uncertainty in the measurements. We also present an analysis of red giants that exhibit solar-like oscillations from the data set of Hekker et al. and compare their amplitudes (as measured from the Kepler light curves) to the strongly variable red giants in the ASAS data set. We find that variable red giants must be quiet in order to sustain solar-like oscillations.
Jimenez was supported by the NOAO/KPNO Research Experiences for Undergraduates (REU) Program which is funded by the National Science Foundation Research Experiences for Undergraduates Program and the Department of Defense ASSURE program through Scientific Program Order No. 13 (AST-0754223) of the Cooperative Agreement No. AST-0132798 between the Association of Universities for Research in Astronomy (AURA) and the NSF.
Jimenez Nicholas J.
Mighell Kenneth J.
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