UBVRI observations of the flickering of the dwarf nova RX And
R. K. Zamanov, G. Nikolov, A. T. Georgieva

TL;DR
This study presents multi-band observations of flickering in the dwarf nova RX And, revealing how brightness variations correlate with changes in the flickering source’s temperature and size.
Contribution
First detailed multi-band flickering analysis of RX And showing how brightness increases affect flickering source properties.
Findings
Flickering amplitude decreases as star brightens.
Flickering source radius roughly doubles during brightness increase.
Flickering source temperature slightly decreases with increased brightness.
Abstract
We report observations of the flickering variability of the dwarf nova RX And in five bands (UBVRI) on two nights. On 25 October 2019 the brightness of the star was mag, the amplitude of the flickering was 0.47 mag, and we estimate for the flickering source temperature K, and radius . On 2 January 2020, the star was about 3 magnitudes brighter (), the amplitude of the flickering was significantly lower (0.07 mag) and we derive for the flickering source K, and radius . The results indicate that 3 magnitudes brightening of the star doubled the radius of the flickering source. The data are available upon request from the authors.
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Taxonomy
TopicsAstrophysical Phenomena and Observations · High-pressure geophysics and materials · X-ray Spectroscopy and Fluorescence Analysis
