Pre-nova X-ray observations of V2491 Cyg (Nova Cyg 2008b)
arXiv:0902.3943 · doi:10.1051/0004-6361/200911710
Abstract
Classical novae are phenomena caused by explosive hydrogen burning on an accreting white dwarf. So far, only one classical nova has been identified in X-rays before the actual optical outburst occurred (V2487 Oph). The recently discovered nova, V2491 Cyg, is one of the fastest (He/N) novae observed so far. Using archival ROSAT, XMM-Newton and Swift data, we show that V2491 Cyg was a persistent X-ray source during its quiescent time before the optical outburst. We present the X-ray spectral characteristics and derive X-ray fluxes. The pre-outburst X-ray emission is variable, and at least in one observation it shows a very soft X-ray source.
arXiv comment4 pages, 2 figures. Astronomy and Astrophysics, in press
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- Swift detection of the super-swift switch-on of the super-soft phase in nova V745 Sco (2014)
- The Morphology of the Expanding Ejecta of V2491 Cygni (2008 N.2)
- An extensive optical study of V2491 Cyg (Nova Cyg 2008 N.2), from maximum brightness to return to quiescence
- Optical and X-ray Observations of M31N 2007-12b: An Extragalactic Recurrent Nova with a Detected Progenitor?
- Getting to know Classical Novae with Swift
- Neil Gehrels Swift Observatory studies of supersoft novae
- On the Progenitor System of Nova V2491 Cygni
- Nova M31N 2007-12b: Supersoft X-rays reveal an intermediate polar?
- Suzaku Detection of Super-hard X-ray Emission from the Classical Nova V2491 Cygni
- Optical observations of "hot" novae returning to quiescence
- X-ray Study of Rekindled Accretion in the Classical Nova V2491 Cygni
- X-ray Spectra and Light Curves of Cooling Novae and a Nova-Like
- A Reanalysis of High Resolution XMM-Newton Data of V2491 Cyg Using Collisionally Ionized Hot Absorber Models