GALEX and Optical Observations of GW Librae During the Long Decline from Superoutburst

Details GALEX and Optical Observations of GW Librae During the Long Decline from Superoutburst GALEX and Optical Observations of GW Librae During the Long Decline from Superoutburst

2011-01-06

arxiv.org/abs/1101.1238v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

32 pages, 13 figures, to be published in The Astronomical Journal

Scientific paper

The prototype of accreting, pulsating white dwarfs (GW Lib) underwent a large amplitude dwarf nova outburst in 2007. We used ultraviolet data from GALEX and ground-based optical photometry and spectroscopy to follow GW Lib for three years following this outburst. Several variations are apparent during this interval. The optical shows a superhump modulation in the months following outburst while a 19 min quasi-periodic modulation lasting for several months is apparent in the year after outburst. A long timescale (about 4 hr) modulation first appears in the UV a year after outburst and increases in amplitude in the following years. This variation also appears in the optical 2 years after outburst but is not in phase with the UV. The pre-outburst pulsations are not yet visible after 3 years, likely indicating the white dwarf has not returned to its quiescent state.

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