R. Viotti et al., THE PECULIAR X-RAY BEHAVIOR OF THE OUTBURSTING SYMBIOTIC STAR AG DRACONIS, Nuclear physics. B, Proceedings supplement, 69(1-3), 1999, pp. 40-43
The symbiotic system AG Dra is one of the best representatives of the
category of the supersoft X-ray sources. The system was subject in rec
ent times to a sequence of visual outbursts which were monitored in X-
rays with the EXOSAT and ROSAT satellites, and in the ultraviolet with
the IUE satellite. We find that during all the outbursts so far monit
ored, the visual brightening was associated with an increase of the UV
flux, while the X-ray countrate largely faded. This systematic optica
l/UV and X-ray anticorrelation is explained, rather than by a quencing
of the high energy source, by the increase of the accretor radius dur
ing outburst, and by the consequent decrease of its surface temperatur
e which moves the maximum emission from soft X-rays to EUV.