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V5116 Sgr: a disc-ecipsed SSS post-outburst nova?

AuthorsSala, Gloria; Hernanz, Margarita ; Ferri, Carlo ; Greiner, Jochen
KeywordsNovae, cataclysmic variables
X-rays: individuals (V5116 Sgr)
Issue DateFeb-2010
CitationAstronomische Nachrichten 331 (2) : 201-204 (2010)
AbstractNova V5116 Sgr 2005 No. 2, discovered on 2005 July 4, was observed with XMM-Newton in March 2007, 20 months after the optical outburst. The X-ray spectrum showed that the nova had evolved to a pure supersoft X-ray source, indicative of residual H-burning on top of the white dwarf. The X-ray light-curve shows abrupt decreases and increases of the flux by a factor 8 with a periodicity of 2.97 h, consistent with the possible orbital period of the system. The EPIC spectra are well fit with an ONe white dwarf atmosphere model, with the same temperature both in the low and the high flux periods. This rules out an intrinsic variation of the X-ray source as the origin of the flux changes, and points to a possible partial eclipse as the origin of the variable light curve. The RGS high resolution spectra support this scenario showing a number of emission features in the low flux state, which either disappear or change into absorption features in the high flux state. A new XMM-Newton observation in March 2009 shows the SSS had turned off and V51 16 Sgr had evolved into a weaker and harder X-ray source.
DescriptionPublicado en línea el 9 de febrero de 2010.
Publisher version (URL)http://dx.doi.org/10.1002/asna.200911327
Appears in Collections:(ICE) Artículos
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