XMM-Newton observations of Nova Sgr 1998

Abstract

We report on X-ray observations of Nova Sagittarius 1998 (V4633 Sgr), performed with XMM-Newton at three different epochs, 934, 1083 and 1265 days after discovery. The nova was detected with the EPIC cameras at all three epochs, with emission spanning the whole energy range from 0.2 to 10 keV. The X-ray spectra do not change significantly at the different epochs, and are well fitted for the first and third observations with a multi-temperature optically thin thermal plasma, while lower statistics in the second observations lead to a poorer fit. The thermal plasma emission is most probably originated in the shock heated ejecta, with chemical composition similar to that of a CO nova. However, we can not completely rule out reestablished accretion as the origin of the emission. We also obtain upper limits for the temperature and luminosity of a potential white dwarf atmospheric component, and conclude that hydrogen burning had already turned-off by the time of our observations.

18 pages, 3 figures. Accepted in Astrophysical Journal

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• OGLE Atlas of Classical Novae I. Galactic Bulge Objects
• Accretion Flows in Nonmagnetic White Dwarf Binaries as Observed in X-rays
• V5116 Sgr, an Eclipsing Supersoft Post-Outburst Nova?
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• X-Ray Spectroscopy of the Classical Nova V458 Vulpeculae with Suzaku
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• The XMM-Newton Detection of Extended Emission from the Nova Remnant of T Pyxidis
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• A Reanalysis of High Resolution XMM-Newton Data of V2491 Cyg Using Collisionally Ionized Hot Absorber Models
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