Intra-night flickering of RS Ophiuchi: I. Sizes and cumulative energies of time structures. (arXiv:1811.09153v1 [astro-ph.SR])
<a href="http://arxiv.org/find/astro-ph/1/au:+Georgiev_T/0/1/0/all/0/1">Ts. B. Georgiev</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Zamanov_R/0/1/0/all/0/1">R. K. Zamanov</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Boeva_S/0/1/0/all/0/1">S. Boeva</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Latev_G/0/1/0/all/0/1">G. Latev</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Spassov_B/0/1/0/all/0/1">B. Spassov</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Marti_J/0/1/0/all/0/1">J. Marti</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Nikolov_G/0/1/0/all/0/1">G. Nikolov</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Ibryamov_S/0/1/0/all/0/1">S. Ibryamov</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Tsvetkova_S/0/1/0/all/0/1">S. V. Tsvetkova</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Stoyanov_K/0/1/0/all/0/1">K. A. Stoyanov</a>
We analyzed 29 pairs of time series in B and V bands of the recurrent nova RS
Oph. The observations were carried out in 2008-2017 with duration 0.6 – 3.6
hours, with time resolution 0.5 – 3.3 min. We scanned digitally each series by
data windows with various sizes Theta and derived two of the simplest fractal
parameters for every Theta – standard deviation D and structural deviation S.
Using the local minima of the structural function log S = f_S(log Theta) we
unveiled 80 time structures, 42 in B band and 38 in V band, with time sizes
10-120 min.
About 3/4 of the time sizes belong to the interval 10-40 min and about 1/4
lie in the interval 60-120 min. The respective cycles per day are 144-36 c/d
and 24-15 c/d. On logarithmic scale, the distribution of the time sizes shows
maximums at about 10, 21, 36 and 74 min. The 10 min flickering is poorly
detectable in our series and we found the most widespread time structures (in
about 1/5 of the cases) have time sizes about 21 min (about 69 c/d). Using the
deviation function log D = f_D(log Theta) we estimated the relative cumulative
energy (including the energy of the shorter structures in it), associated with
the detected structure sizes, to be in the interval of the relative fluxes 2-11
%. The energies correlate weakly with the logarithms of the structure sizes,
with correlation coefficients 0.60 and 0.57, under slope coefficients 0.04 and
0.03 in B and V band, respectively. The distributions of the energies occur
bimodal, with maximums about 4% and 6% in B band, as well as about 3% and 5% in
V band. The left and right modes of the distributions may be associated with
the structure sizes 10 – 21 min and 37 – 74 min, respectively.
We analyzed 29 pairs of time series in B and V bands of the recurrent nova RS
Oph. The observations were carried out in 2008-2017 with duration 0.6 – 3.6
hours, with time resolution 0.5 – 3.3 min. We scanned digitally each series by
data windows with various sizes Theta and derived two of the simplest fractal
parameters for every Theta – standard deviation D and structural deviation S.
Using the local minima of the structural function log S = f_S(log Theta) we
unveiled 80 time structures, 42 in B band and 38 in V band, with time sizes
10-120 min.
About 3/4 of the time sizes belong to the interval 10-40 min and about 1/4
lie in the interval 60-120 min. The respective cycles per day are 144-36 c/d
and 24-15 c/d. On logarithmic scale, the distribution of the time sizes shows
maximums at about 10, 21, 36 and 74 min. The 10 min flickering is poorly
detectable in our series and we found the most widespread time structures (in
about 1/5 of the cases) have time sizes about 21 min (about 69 c/d). Using the
deviation function log D = f_D(log Theta) we estimated the relative cumulative
energy (including the energy of the shorter structures in it), associated with
the detected structure sizes, to be in the interval of the relative fluxes 2-11
%. The energies correlate weakly with the logarithms of the structure sizes,
with correlation coefficients 0.60 and 0.57, under slope coefficients 0.04 and
0.03 in B and V band, respectively. The distributions of the energies occur
bimodal, with maximums about 4% and 6% in B band, as well as about 3% and 5% in
V band. The left and right modes of the distributions may be associated with
the structure sizes 10 – 21 min and 37 – 74 min, respectively.
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