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- Title
X-ray and UV observations of V751 Cygni in an optical high state.
- Authors
Page, K. L.; Osborne, J. P.; Beardmore, A. P.; Evans, P. A.; Rosen, S. R.; Watson, M. G.
- Abstract
Aims. The VY Scl system (anti-dwarf nova) V751 Cyg is examined following a claim of a super-soft spectrum in the optical low state. Methods. A serendipitous XMM-Newton X-ray observation and, 21 months later, Swift X-ray and UV observations, have provided the best such data on this source so far. These optical high-state datasets are used to study the flux and spectral variability of V751 Cyg. Results. Both the XMM-Newton and Swift data show evidence for modulation of the X-rays for the first time at the known 3.467 h orbital period of V751 Cyg. In two Swift observations, taken ten days apart, the mean X-ray flux remained unchanged, while the UV source brightened by half a magnitude. The X-ray spectrum was not super-soft during the optical high state, but rather due to multi-temperature optically thin emission, with significant (1021-22 cm-2) absorption, which was higher in the observation by Swift than that of XMM-Newton. The X-ray flux is harder at orbital minimum, suggesting that the modulation is related to absorption, perhaps linked to the azimuthally asymmetric wind absorption seen previously in Hα.
- Subjects
X-ray binaries; P Cygni stars; XMM-Newton Observatory (Artificial satellite); CATACLYSMIC variable stars; NOVAE (Astronomy); ULTRAVIOLET stars; STELLAR magnitudes
- Publication
Astronomy & Astrophysics / Astronomie et Astrophysique, 2014, Vol 570, p1
- ISSN
0004-6361
- Publication type
Article
- DOI
10.1051/0004-6361/201424777