THE LONG-TERM X-RAY LIGHTCURVE OF RX-J-0527.8-6954

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