The long-term X-ray lightcurve of RX J0527.8--6954

Details The long-term X-ray lightcurve of RX J0527.8--6954 The long-term X-ray lightcurve of RX J0527.8--6954

1996-01-23

arxiv.org/abs/astro-ph/9601124v1

Astronomy and Astrophysics

Astrophysics

6 pages LATEX (with A&A style macro l-aa.tex) including 1 postscript figure (using psfig.tex) accepted for publication in Astr

Scientific paper

Supersoft X-ray sources are commonly believed to be stably burning white dwarfs. However, the observations of some supersoft sources show dramatic variability of their X-ray flux on timescales ranging from days to years. Here, we present further observational data of the supersoft X-ray source RX J0527.8--6954 exhibiting a continuous decline over the past 5 yrs. With no clear trend of a concordant temperature decrease this might suggest a evolutionary scenario where the WD leaves the steady burning branch and the combined effect of reduced luminosity and cooling at constant radius produces the observed effect.

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