The X-ray spectra of VW Hydri during the outburst cycle

Details The X-ray spectra of VW Hydri during the outburst cycle The X-ray spectra of VW Hydri during the outburst cycle

1999-08-09

arxiv.org/abs/astro-ph/9908096v1

Astronomy and Astrophysics

Astrophysics

Accepted for publication in A&A main journal

Scientific paper

We report six BeppoSAX X-ray observations of VW Hydri during and after the outburst of Sep 23 1998. The outburst flux is lower than the quiescent flux in the entire observed energy band (0.1-10 keV), in agreement with earlier observations. The X-ray spectra are fitted with two-temperature plasma and cooling flow spectral models. These fits show a clear spectral evolution in X-rays for the first time in VW Hydri: the hard X-ray turn-up after the outburst is reflected in the emission measure and the temperature. Moreover, during outburst the 1.5-10 keV flux decreases significantly. We argue that this is not consistent with the constant flux during a ROSAT outburst observation made eight years earlier. We conclude from this observation that there are significant differences between outburst X-ray lightcurves of VW Hydri.

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