Characterization of Cataclysmic Variables and White Dwarfs in the Kepler Field
MetadataShow full item record
We present long baseline Kepler photometry and ground-based Hale 200" spectroscopy of five known white dwarfs, five newly identified white dwarfs, and a cataclysmic variable, V523 Lyr. Analysis of the photometric and spectroscopic data is used to characterize the white dwarfs and the cataclysmic variable, by determining preliminary fundamental parameters. We model the white dwarfs to determine their fundamental parameters, effective temperature and surface gravity. If the effective temperature of a white dwarf falls within a specific range, the white dwarf is expected to be a pulsator. We verified possible pulsation with complementary Kepler light curves when possible. The modeled effective temperatures place one out of our ten white dwarfs in the pulsator regime. Pulsating white dwarfs help to refine the temperature range where pulsations occur and are used to probe their internal structure. V523 Lyr is hypothesized to be a dwarf nova type cataclysmic variable, which exhibits 28 outbursts over ~1000 days of Kepler data. The outbursts are quasi-periodic and occur approximately every 25 days and last ~9 days. V523 Lyr is hypothesized to be on the rise of an outburst during our spectral observations.