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GW Librae : still hot eight years post-outburst
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Szkody, Paula, Mukadam, Anjum S., Gänsicke, B. T. (Boris T.), Chote, Paul, Nelson, Peter, Myers, Gordon, Toloza, Odette, Waagen, Elizabeth O., Sion, Edward M., Sullivan, Denis J. and Townsley, Dean M. (2016) GW Librae : still hot eight years post-outburst. The Astronomical Journal, 152 (2). 48. doi:10.3847/0004-6256/152/2/48 ISSN 0004-6256.
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Official URL: http://dx.doi.org/10.3847/0004-6256/152/2/48
Abstract
We report continued Hubble Space Telescope (HST) ultraviolet spectra and ground-based optical photometry and spectroscopy of GW Librae eight years after its largest known dwarf nova outburst in 2007. This represents the longest cooling timescale measured for any dwarf nova. The spectra reveal that the white dwarf still remains about 3000 K hotter than its quiescent value. Both ultraviolet and optical light curves show a short period of 364–373 s, similar to one of the non-radial pulsation periods present for years prior to the outburst, and with a similar large UV/optical amplitude ratio. A large modulation at a period of 2 hr (also similar to that observed prior to outburst) is present in the optical data preceding and during the HST observations, but the satellite observation intervals did not cover the peaks of the optical modulation, and so it is not possible to determine its corresponding UV amplitude. The similarity of the short and long periods to quiescent values implies that the pulsating, fast spinning white dwarf in GW Lib may finally be nearing its quiescent configuration.
Item Type: | Journal Article | ||||||||
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Subjects: | Q Science > QB Astronomy Q Science > QC Physics |
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||
Library of Congress Subject Headings (LCSH): | Dwarf novae, Cataclysmic variable stars, Ultraviolet spectra | ||||||||
Journal or Publication Title: | The Astronomical Journal | ||||||||
Publisher: | Institute of Physics Publishing, Inc. | ||||||||
ISSN: | 0004-6256 | ||||||||
Official Date: | 4 August 2016 | ||||||||
Dates: |
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Volume: | 152 | ||||||||
Number: | 2 | ||||||||
Article Number: | 48 | ||||||||
DOI: | 10.3847/0004-6256/152/2/48 | ||||||||
Status: | Peer Reviewed | ||||||||
Publication Status: | Published | ||||||||
Access rights to Published version: | Restricted or Subscription Access | ||||||||
Date of first compliant deposit: | 10 March 2017 | ||||||||
Date of first compliant Open Access: | 10 March 2017 | ||||||||
Funder: | Space Telescope Science Institute (U.S.), National Science Foundation (U.S.) (NSF), Seventh Framework Programme (European Commission) (FP7), European Research Council (ERC) | ||||||||
Grant number: | HST-GO13807 (Space Telescope Science Institute), AST-1514737 (NSF), FP/2007–2013 (FP7), 320964 (ERC) |
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