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19 April 2024

» arxiv » 1101.1238

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GALEX and Optical Observations of GW Librae During the Long Decline from Superoutburst
Eric Bullock ; Paula Szkody ; Anjum S. Mukadam ; Bernardo W. Borges ; Luciano Fraga ; Boris T. Gänsicke ; Thomas E. Harrison ; Arne Henden ; Jon Holtzman ; Steve B. Howell ; Warrick A. Lawson ; Stephen Levine ; Richard M. Plotkin ; Mark Seibert ; Matthew Templeton ; Johanna Teske ; Frederick J. Vrba ;
Date:	6 Jan 2011
Abstract:	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.
Source:	arXiv, 1101.1238
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