Photometric Flickering of the CH CYG IN 2018

Abstract

Photometric observations of the CH Cyg symbiotic star were conducted using the Zeiss 600 telescope at the ShAO (Shamakhy Astrophysical Observatory) between 06.07.2018 and 16.09.2018 over the course of 17 nights with the V-filter. The light curve for this star was constructed based on our observations and data from the AAVSO (American Association of Variable Star Observers) database. To analyze the nature of the variability, we performed statistical spectral Fourier analysis utilizing the Scargle method. Our findings align perfectly with those of the AAVSO. The star’s light has increased during the observation period up to 2 stars size – from 8.5m to 6.5m. Continuous observations have shown that short-term flickering of the star occurs during the night up to 0.2-0.45 magnitude. We suppose that the cause of these flickering is the increase in the flow rate of matter from the Red Giant star to the surface of the White Dwarf in the period close to the periastron.

Keywords

• symbiotic star
• ch cyg
• photometric variable
• flickering
• power spectrum
• observation
• cdd photometry