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HST and optical data reveal white dwarf cooling, spin, and periodicities in GW Librae 3-4 years after outburst
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Szkody, Paula, Mukadam, Anjum S., Gänsicke, B. T. (Boris T.), Henden, Arne, Sion, Edward M., Townsley, Dean, Chote, Paul, Harmer, Diane, Harpe, Eric J., Hermes, J. J., Sullivan, Denis J. and Winget, D. E. (2012) HST and optical data reveal white dwarf cooling, spin, and periodicities in GW Librae 3-4 years after outburst. Astrophysical Journal, Volume 753 (Number 2). Article no. 158. doi:10.1088/0004-637X/753/2/158 ISSN 0004-637X.
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Official URL: http://dx.doi.org/10.1088/0004-637X/753/2/158
Abstract
Since the large amplitude 2007 outburst which heated its accreting, pulsating white dwarf, the dwarf nova system GW Librae has been cooling to its quiescent temperature. Our Hubble Space Telescope ultraviolet spectra combined with ground-based optical coverage during the third and fourth year after outburst show that the fluxes and temperatures are still higher than quiescence (T = 19,700K and 17,300K versus 16,000K pre-outburst for a log g = 8.7 and d = 100pc). The K wd of 7.6 ± 0.8km s -1 determined from the C Iλ1463 absorption line, as well as the gravitational redshift implies a white dwarf mass of 0.79 ± 0.08 M . The widths of the UV lines imply a white dwarf rotation velocity v sin i of 40km s -1 and a spin period of 209s (for an inclination of 11deg and a white dwarf radius of 7 × 10 8cm). Light curves produced from the UV spectra in both years show a prominent multiplet near 290s, with higher amplitude in the UV compared to the optical, and increased amplitude in 2011 versus 2010. As the presence of this set of periods is intermittent in the optical on weekly timescales, it is unclear how this relates to the non-radial pulsations evident during quiescence. © 2012. The American Astronomical Society. All rights reserved..
| Item Type: | Journal Article | ||||
|---|---|---|---|---|---|
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
| Journal or Publication Title: | Astrophysical Journal | ||||
| Publisher: | IOP Publishing | ||||
| ISSN: | 0004-637X | ||||
| Official Date: | 10 July 2012 | ||||
| Dates: |
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| Volume: | Volume 753 | ||||
| Number: | Number 2 | ||||
| Page Range: | Article no. 158 | ||||
| DOI: | 10.1088/0004-637X/753/2/158 | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Restricted or Subscription Access |
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