astro-ph.SR

# Title:Optical Flickering of the recurrent nova RS Ophiuchi: amplitude - flux relation

Abstract: We report observations of the flickering variability of the symbiotic recurrent nova RS~Oph at quiescence in five bands ($UBVRI$). We find evidence of a correlation between the peak-to-peak flickering amplitude ($\Delta F$) and the average flux of the hot component ($F_{\rm av}$). The correlation is highly significant, with a correlation coefficient of 0.85 and a $p$-value of~$\sim 10^{-20}$. Combining the data from all wavebands, we find a dependence of the type $\Delta F \propto F^k_{\rm av}$, with power-law index $k = 1.02 \pm 0.04$ for the $UBVRI$ flickering of RS~Oph. Thus, the relationship between the amplitude of variability and the average flux of the hot component is consistent with linearity. The rms amplitude of flickering is on average 8 per cent ($\pm2$ per cent) of $F_{\rm av}$. The detected correlation is similar to that found in accreting black holes/neutron stars and cataclysmic variables. The possible reasons are briefly discussed. The data are available upon request from the authors.
 Comments: accepted: MNRAS 450, 3958-3965 (2015) Subjects: Solar and Stellar Astrophysics (astro-ph.SR) Journal reference: MNRAS 450, 3958-3965 (2015) DOI: 10.1093/mnras/stv873 Cite as: arXiv:1501.02628 [astro-ph.SR] (or arXiv:1501.02628v2 [astro-ph.SR] for this version)

## Submission history

From: Radoslav K. Zamanov [view email]
[v1] Mon, 12 Jan 2015 12:57:23 UTC (155 KB)
[v2] Thu, 21 May 2015 11:07:46 UTC (272 KB)
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