UV and X-Ray Monitoring of AG Draconis During the 1994/1995 Outbursts

Details UV and X-Ray Monitoring of AG Draconis During the 1994/1995 Outbursts UV and X-Ray Monitoring of AG Draconis During the 1994/1995 Outbursts

1996-06-20

arxiv.org/abs/astro-ph/9606130v1

Astronomy and Astrophysics

Astrophysics

12 pages postscript incl. figures, Proc. of Workshop on Supersoft X-Ray Sources, to appear in Lecture Notes in Physics vol. 47

Scientific paper

The recent 1994-1995 active phase of AG Draconis has given us for the first time the opportunity to follow the full X-ray behaviour of a symbiotic star during two successive outbursts and to compare with its quiescence X-ray emission. With \ros observations we have discovered a remarkable decrease of the X-ray flux during both optical maxima, followed by a gradual recovering to the pre-outburst flux. In the UV the events were characterized by a large increase of the emission line and continuum fluxes, comparable to the behaviour of AG Dra during the 1980-81 active phase. The anticorrelation of X-ray/UV flux and optical brightness evolution is shown to very likely be due to a temperature decrease of the hot component. Such a temperature decrease could be produced by an increased mass transfer to the burning compact object, causing it to slowly expand to about twice its original size.

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