Physics – Nuclear Physics
Scientific paper
Jan 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999nuphs..69...40v&link_type=abstract
Nuclear Physics B Proceedings Supplements, Volume 69, Issue 1-3, p. 40-43.
Physics
Nuclear Physics
2
Scientific paper
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 recent 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 monitored, the visual brightening was associated with an increase of the UV flux, while the X-ray countrate largely faded. This systematic optical/UV and X-ray anticorrelation is explained, rather than by a quenching of the high energy source, by the increase of the accretor radius during outburst, and by the consequent decrease of its surface temperature which moves the maximum emission from soft X-rays to EUV.
Gonzalez Riestra Rosario
Greiner Jochen
Viotti Roberto
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