Accretion in the recurrent nova T CrB: Linking the superactive state to the predicted outburst
2023
Online
report
Context: T CrB (NOVA CrB 1946) is a famous recurrent nova with a recurrence timescale of 80 years. Aims: We aim to estimate the colours, luminosity, and mass-accretion rate for T CrB (NOVA CrB 1946) during and after the superactive state. Methods and Results: We performed and analysed $UBV$ photometry of the recurrent nova T~CrB. For the hot component of T~CrB, we find average dereddened colours of $(U-B)_0 = -0.70 \pm 0.08$ and $(B-V)_0 = 0.23 \pm 0.06$, which correspond to an effective temperature of $9400 \pm 500$~K and an optical luminosity of $40-110~L_\odot$ during the superactive state (2016-2022). After the end of the superactive state, the hot component became significantly redder, $(U-B)_0 \approx -0.3$ and $(B-V)_0 \approx 0.6$ in August 2023, and its luminosity decreased markedly to $20-25$~$L_\odot$ in April-May 2023, and to $8-9~L_\odot$ in August 2023. The total mass accreted during the superactive state from 2014 to 2023 is $\sim 2 \times 10^{-7}$~M$_\odot$. This is a significant fraction of the mass required to cause a thermonuclear runaway (TNR). Overall our results support a model in which a large accretion disc acts as a reservoir with increased accretion rate onto the central white dwarf during disc high states, ultimately leading to a TNR explosion, which now seems to be imminent.
Comment: Astronomy & Astrophysics (accepted)
Titel: |
Accretion in the recurrent nova T CrB: Linking the superactive state to the predicted outburst
|
---|---|
Autor/in / Beteiligte Person: | Zamanov, R. ; Boeva, S. ; Latev, G. Y. ; Semkov, E. ; Minev, M. ; Kostov, A. ; Bode, M. F. ; Marchev, V. ; Marchev, D. |
Link: | |
Veröffentlichung: | 2023 |
Medientyp: | report |
Schlagwort: |
|
Sonstiges: |
|