Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...309l..11r&link_type=abstract
Astronomy and Astrophysics, v.309, p.L11-L14
Astronomy and Astrophysics
Astrophysics
35
Accretion, Stars: Binaries: Close, Stars: Binaries: Spectroscopic, Stars: Individual (Rx J0513.9-6951), Stars: Novae, Cataclysmic Variables, X-Rays: Stars
Scientific paper
We report the results of our optical multicolour monitoring campaign of the supersoft X-ray source RX J0513.9-6951. During this campaign, RX J0513.9-6951 went through an optical low-state, lasting ~40days. The decrease of the optical flux, {DELTA}V~1mag, and the accompanying reddening, {DELTA}(B-V)~0.1-0.2mag and {DELTA}(V-R)~0.1mag, can be quantitatively described by variations in the irradiation of the accretion disk by the hot central star. In this simple model, we consider a white dwarf with nuclear burning of accreted matter. Its photospheric radius shrinks in response to a temporarily slightly reduced mass-transfer rate. The same model can account for the temporarily increased soft X-ray flux observed twice with ROSAT and we expect that during the optical low-state the system turned on again as a soft X-ray source in the 0.1-2.4keV energy band.
Abbott Timothy Mark Cameron
Beuermann Klaus
Reinsch Klaus
van Teeseling Andre
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