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Swift X-ray and UV monitoring of the Classical Nova V458 Vul (Nova Vul 2007)
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(2009) Swift X-ray and UV monitoring of the Classical Nova V458 Vul (Nova Vul 2007). The Astronomical Journal, Vol. 137 (No. 5). pp. 4160-4168. doi:10.1088/0004-6256/137/5/4160 ISSN 0004-6256.
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Official URL: http://dx.doi.org/10.1088/0004-6256/137/5/4160
Abstract
We describe the highly variable X-ray and UV emission of V458 Vul (Nova Vul 2007), observed by Swift between 1 and 422 days after outburst. Initially bright only in the UV, V458 Vul became a variable hard X-ray source due to optically thin thermal emission at kT = 0.64 keV with an X-ray band unabsorbed luminosity of 2.3 × 1034 erg s–1 during days 71-140. The X-ray spectrum at this time requires a low Fe abundance (0.2+0.3–0.1 solar), consistent with a Suzaku measurement around the same time. On day 315 we find a new X-ray spectral component which can be described by a blackbody with temperature of kT = 23+9–5 eV, while the previous hard X-ray component has declined by a factor of 3.8. The spectrum of this soft X-ray component resembles those typically seen in the class of supersoft sources (SSS) which suggests that the nova ejecta were starting to clear and/or that the white dwarf photosphere is shrinking to the point at which its thermal emission reaches into the X-ray band. We find a high degree of variability in the soft component with a flare rising by an order of magnitude in count rate in 0.2 days. In the following observations on days 342.4-383.6, the soft component was not seen, only to emerge again on day 397. The hard component continued to evolve, and we found an anticorrelation between the hard X-ray emission and the UV emission, yielding a Spearman rank probability of 97%. After day 397, the hard component was still present, was variable, and continued to fade at an extremely slow rate but could not be analyzed owing to pile-up contamination from the bright SSS component.
| Item Type: | Journal Article | ||||
|---|---|---|---|---|---|
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
| Journal or Publication Title: | The Astronomical Journal | ||||
| Publisher: | The American Astronomical Society | ||||
| ISSN: | 0004-6256 | ||||
| Official Date: | 2009 | ||||
| Dates: |
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| Volume: | Vol. 137 | ||||
| Number: | No. 5 | ||||
| Page Range: | pp. 4160-4168 | ||||
| DOI: | 10.1088/0004-6256/137/5/4160 | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published |
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