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Galex and Optical Observations of GW Librae during the Long Decline from SuperoutburstThe prototype of accreting, pulsating white dwarfs (GW Lib) underwent a large amplitude dwarf nova outburst in 2007. We used ultraviolet data from Galaxy Evolution Explorer 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 minute 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 two years after outburst but is not in phase with the UV. The pre-outburst pulsations are not yet visible after three years, likely indicating the white dwarf has not returned to its quiescent state.
Document ID
20120008347
Acquisition Source
Headquarters
Document Type
Reprint (Version printed in journal)
Authors
Bullock, Eric
(Washington Univ. Seattle, WA, United States)
Szkody, Paula
(Washington Univ. Seattle, WA, United States)
Mukadam, Anjum S.
(Washington Univ. Seattle, WA, United States)
Borges, Bernardo W.
(Universidade Federal da Grande Dourados Dourados, Brazil)
Fraga, Luciano
(Cerro Tololo Inter-American Observatory La Serena, Chile)
Gansicke, Boris T.
(Warwick Univ. Coventry, United Kingdom)
Harrison, Thomas E.
(New Mexico State Univ. Las Cruces, NM, United States)
Henden, Arne
(American Association of Variable Star Observers Cambridge, MA, United States)
Holtzman, Jon
(New Mexico State Univ. Las Cruces, NM, United States)
Howell, Steve B.
(National Optical Astronomy Observatories Tucson, AZ, United States)
Lawson, Warrick A.
(New South Wales Univ. Canberra, Australia)
Levine, Stephen
(Naval Observatory Flaggstaff, AZ, United States)
Plotkin, Richard M.
(Washington Univ. Seattle, WA, United States)
Seibert, Mark
(Carnegie Institution of Washington Pasadena, CA, United States)
Templeton, Matthew
(American Association of Variable Star Observers Cambridge, MA, United States)
Teske, Johanna
(Arizona Univ. Tucson, AZ, United States)
Vrba, Frederick J.
(Naval Observatory Flaggstaff, AZ, United States)
Date Acquired
August 25, 2013
Publication Date
March 1, 2011
Publication Information
Publisher: American Astronautical Society
Subject Category
Astronomy
Report/Patent Number
AD-A538731
Funding Number(s)
CONTRACT_GRANT: NNX09AF87G
CONTRACT_GRANT: NNX08AU43G
Distribution Limits
Public
Copyright
Other

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