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White dwarf variability with gPhoton: pulsators

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Bell,  Keaton J.
Max Planck Research Group in Stellar Ages and Galactic Evolution (SAGE), Max Planck Institute for Solar System Research, Max Planck Society;

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Citation

Tucker, M. A., Fleming, S. W., Pelisoli, I., Romero, A., Bell, K. J., Kepler, S. O., et al. (2018). White dwarf variability with gPhoton: pulsators. Monthly Notices of the Royal Astronomical Society, 475(4), 4768-4780. doi:10.1093/mnras/stx3297.


Cite as: http://hdl.handle.net/21.11116/0000-0003-4FDE-C
Abstract
We present results from a search for short time-scale white dwarf variability using gPhoton, a time-tagged data base of GALEX photon events and associated software package. We conducted a survey of 320 white dwarf stars in the McCook–Sion catalogue, inspecting each for photometric variability with particular emphasis on variability over time-scales less than ∼30  min. From that survey, we present the discovery of a new pulsating white dwarf: WD 2246-069. A Ca ii K line is found in archival ESO spectra and an IR excess is seen in WISE W1 and W2 bands. Its independent modes are identified in follow-up optical photometry and used to model its interior structure. Additionally, we detect UV pulsations in four previously known pulsating ZZ Ceti-type (DAVs). Included in this group is the simultaneous fitting of the pulsations of WD 1401-147 in optical, near-ultraviolet and far-ultraviolet bands using nearly concurrent Whole Earth Telescope and GALEX data, providing observational insight into the wavelength dependence of white dwarf pulsation amplitudes.