Flickering variability of T Coronae Borealis

Abstract

We present electro-photometric UBV and high-speed U-band flickering observations of the recurrent nova T CrB during a period when its U brightness varies by more than 2 mag. The V band is dominated by the ellipsoidal variability of the red giant, however, the variability of the hot component also causes 0.15 mag variations in V. We define a set of parameters which characterise the flickering. The Fourier spectra of all 27 nights are similar to each other. The power spectral density of the variations has a power law component (f^{-1.46} on average). We do not detect a dependence of the Fourier spectra and autocorrelation function on the brightness of the object. Having subtracted the contribution of the red giant, we show that the flickering amplitude correlates with the average flux of the accreting component. A comparison with CH Cyg and MWC 560 indicates that the flickering of T CrB is more stable (at least during the time of our observations), than that in the jet-ejecting symbiotic stars. The data are available in electronic form from the authors.

8 pages, 6 figures, 2 tables, accepted for publication in MNRAS

References in corpus (9)

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• A Search for Rapid Photometric Variability in Symbiotic Binaries
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• The Behavior of Novae Light Curves Before Eruption
• The B & V Light Curves for Recurrent Nova T CrB From 1842--2022, the Unique Pre- and Post-Eruption High-States, the Complex Period Changes, and the Upcoming Eruption in 2025.5$\pm$1.3
• Active phases and flickering of a symbiotic recurrent nova T CrB
• Searching for flickering statistics in T CrB
• Symbiotic star T CrB as an extreme SU UMa type dwarf nova
• Optical Flickering of the recurrent nova RS Ophiuchi: amplitude - flux relation
• T CrB: overview of the accretion history, Roche-lobe filling, orbital solution, and radiative modeling
• Bipolar jets growth and decline in Hen 3-1341: a direct link to fast wind and outburst evolution
• Rapid H-alpha variability in T Coronae Borealis