Astronomy and Astrophysics – Astrophysics
Scientific paper
1999-03-17
Astronomy and Astrophysics
Astrophysics
6 pages including 2 figures, to be published in ApJ Letters
Scientific paper
10.1086/312027
A new interpretation for the second peak of T Coronae Borealis (T CrB) outbursts is proposed based on a thermonuclear runaway (TNR) model. The system consists of a very massive white dwarf (WD) with a tilting accretion disk and a lobe-filling red-giant. The first peak of the visual light curve of T CrB outbursts is well reproduced by the TNR model on a WD close to the Chandrasekhar mass ($M_{\rm WD} \gtrsim 1.35 ~M_\odot$), while the second peak is reproduced by the combination of the irradiated M-giant and the irradiated tilting disk. The derived fitting parameters are the WD mass $M_{\rm WD} \sim 1.35 ~M_\odot$, the M-giant companion mass $M_{\rm RG} \sim 0.7 M_\odot$ ($0.6-1.0 M_\odot$ is acceptable), the inclination angle of the orbit $i \sim 70 \arcdeg$, and the tilting angle of the disk $i_{\rm prec} \sim 35 \arcdeg$. These parameters are consistent with the recently derived binary parameters of T CrB.
Hachisu Izumi
Kato Mariko
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