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HST Observations of the DAV White Dwarf G 226--29

Kepler, S. O.; Robinson, E. L.; Nather, R. E.

We observed G 226-29 for 15 hours with the HST and detected two problems in spectrograms obtained with the post-COSTAR Faint Object Spectrograph and the G160L grating. First, using the 1 arcsec entrance aperture with a triple peakup, we found a strong ( =~ 3 %) modulation of the total count rate on a time scale similar to the HST orbital period. S…