Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-10-11
Astronomy and Astrophysics
Astrophysics
2 pages, to appear in "The Physics of Cataclysmic Variables and Related Objects", eds. B. Gaensicke, K. Beuermann & K. Reinsch
Scientific paper
The recurrent nova CI Aquilae entered the final decline phase a bit before May of 2001, showing the slowest evolution among the recurrent novae. Based on the optically thick wind mass-loss theory of the thermonuclear runaway model, we have estimated the turn-off time of the CI Aql 2000 outburst in March of 2001, after a supersoft X-ray source (SSS) phase lasts 150 days from December of 2000 until May of 2001. Fitting our theoretical light curves with both the 1917 and 2000 outbursts, we also obtained the WD mass to be M_{WD}= 1.2 \pm 0.05 M_\sun, helium enrichment of ejecta, He/H ~ 0.5 by number, the mass of the hydrogen-rich envelope on the WD of \Delta M ~ 6 x 10^{-6} M_\sun at the optical maximum, which is indicating an average mass accretion rate of \dot M_{acc} ~ 0.8 x 10^{-7} M_\sun yr^{-1} during the quiescent phase between the 1917 and 2000 outbursts.
Hachisu Izumi
Kato Mariko
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