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Periodic Variability of the Symbiotic Star CH Cyg


Affiliations
1 Batabat Astrophysical Observatory of Nakhchivan branch of ANAS, Nakhchivan,, Azerbaijan
2 Baku State University, Baku,, Azerbaijan
 

Using the AAVSO database of photometric observations, the light curve of the symbiotic star CH Cyg was constructed for 1963-2021. Analysis of the light curve showed that all minima correspond to variations of ~750 days, excluding the period of the outburst of stars. Periodic analysis of the brightness and radial velocities of absorption lines was carried out using the Fourier scargle analysis. The light curves for 1966-1976 and 2000-2005 revealed a period of 750 days, corresponding to the relatively quiet state of the star, and 751 days for the velocities of the absorption lines of the red giant. The radial-velocity curve is ahead of the light curve by 0.30 phases.

Keywords

Symbiotic stars; CH Cyg; Photometry; Radial velocity; Period.
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  • Munari U, Renzini A, Bernacca PL. HIPPARCOS Observations of Symbiotic Stars. InHipparcos-Venice'97 1997 (Vol. 402, pp. 413-416).

  • Yamashita Y. A binary model for CH Cygni.

  • Tomov T, Kolev D, Munari U, et al. Time-resolved high-resolution spectroscopy of CH Cygni: evidence for a magnetic propeller state in 1994. Mon. Not. R. Astron. Soc. 1996;278(2):542-50.

  • Sokoloski JL, Kenyon SJ. CH Cygni. II. Optical Flickering from an Unstable Disk. Astrophys. J. 2003;584(2):1027.

  • Hinkle KH, Fekel FC, Johnson DS, et al. The triple symbiotic system CH Cygni.

  • Mammadov RT, Mikailov KM, Alakbarov IA. 750-DAYS VARIABILITY OF THE CH CYG. J. OF AZERBAIJAN. 2022 :37.

  • Hinkle KH, Fekel FC, Joyce RR. Infrared Spectroscopy of Symbiotic Stars. VII. Binary Orbit and Long Secondary Period Variability of CH Cygni. Astrophys. J. 2009;692(2):1360.

  • Iijima T, Naito H, Narusawa S. High-velocity equatorial mass ejections and some other spectroscopic phenomena of the symbiotic star CH Cygni in an active stage. Astron. Astrophys. 2019;622:A45.


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  • Periodic Variability of the Symbiotic Star CH Cyg

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Authors

Mammadov Ruslan
Batabat Astrophysical Observatory of Nakhchivan branch of ANAS, Nakhchivan,, Azerbaijan
Mikailov Khidir
Baku State University, Baku,, Azerbaijan

Abstract


Using the AAVSO database of photometric observations, the light curve of the symbiotic star CH Cyg was constructed for 1963-2021. Analysis of the light curve showed that all minima correspond to variations of ~750 days, excluding the period of the outburst of stars. Periodic analysis of the brightness and radial velocities of absorption lines was carried out using the Fourier scargle analysis. The light curves for 1966-1976 and 2000-2005 revealed a period of 750 days, corresponding to the relatively quiet state of the star, and 751 days for the velocities of the absorption lines of the red giant. The radial-velocity curve is ahead of the light curve by 0.30 phases.

Keywords


Symbiotic stars; CH Cyg; Photometry; Radial velocity; Period.

References