Other
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21734207k&link_type=abstract
American Astronomical Society, AAS Meeting #217, #342.07; Bulletin of the American Astronomical Society, Vol. 43, 2011
Other
Scientific paper
Flare emission is thought to be the observational consequence of transiently heated plasma by the dynamic interaction of magnetic fields throughout the stellar atmosphere. Other magnetic activity measures indicate that age may be a fundamental parameter for the generation and presence of surface magnetic fields. However, flares have been observed on both old and young stars, and the importance of age on the flare rate of a stellar population is not well known, as previous flare rate studies have been limited to the surrounding solar neighborhood and young disk population. The SWEEPS project monitored a 202x202 arcsec dense stellar field in the Sagittarius window of the Galactic bulge for a continuous seven-day period using the HST/ACS F606W (V) and F814W (I) filters. These data were aimed at a search for transiting exoplanets, but the high-cadence light curves, consisting of 260 epochs in each filter, provide a unique repository to mine for flare incidence in an evolved stellar population of dwarfs. We employ a customized algorithm to search for flares on 200,000 cool dwarfs of intermediate-old age, and we study the stellar flare rate and flare properties as a function of mass, V - I color, and the degree of underlying variability. These rates allow us to compare to the flare rates of younger stars and to extend the investigation of the evolution of magnetic activity to an older stellar population.
Hawley Suzanne L.
Kowalski Adam
Osten Rachel Ann
Sahu Kailash C.
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