Other
Scientific paper
Nov 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aipc..637..284h&link_type=abstract
CLASSICAL NOVA EXPLOSIONS: International Conference on Classical Nova Explosions. AIP Conference Proceedings, Volume 637, pp. 2
Other
3
Novae, Dwarf Novae, Recurrent Novae, And Other Cataclysmic Variables, Supernovae, Faint Blue Stars, White Dwarfs, Degenerate Stars, Nuclei Of Planetary Nebulae, Accretion And Accretion Disks, Masses
Scientific paper
Theoretical light curves of 8 recurrent novae in outburst are modeled to obtain various physical parameters. Light curve calculation includes reflection effects of the companion star and the accretion disk by the photosphere of the white dwarf (WD). We also include a radiation-induced warping instability of the accretion disk in order to reproduce the second peak of T CrB outbursts. The early visual light curves are well reproduced with an expanded WD photosphere of a thermonuclear runaway model on a very massive WD close to the Chandrasekhar mass limit, i.e., MWD = 1.35 - 1.37 Msolar except for CI Aql. The white dwarf mass of CI Aql is estimated to be MWD = 1.2 +/- 0.05 Msolar. Optically thick winds, which blow from the WDs during the outbursts, play a key role in determining the nova duration and the speed of decline because the wind quickly reduces the envelope mass on the WD. Each envelope mass at the optical maximum is estimated, which indicates an average mass accretion rate on to the WDs during the quiescent phase before the last outburst. Although a large part of the envelope mass is blown in the wind, each WD can retain a substantial part of the envelope mass after hydrogen burning ends. Thus, we have obtained net mass-increasing rates of the WDs. These obtained values strongly indicate that the WDs in the recurrent novae have now grown up to near the Chandrasekhar mass limit and will soon explode as a Type Ia supernova if the WDs consist of carbon and oxygen. We have also clarified the reason why only T CrB shows a secondary maximum.
Hachisu Izumi
Kato Mariko
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