ACTIVITY OF SYMBIOTIC STAR CI CYG BETWEEN 2008 AND 2012
Section: STARS AND THE INTERSTELLAR MEDIUM
Authors:
1.
Crimean Astrophysical Observatory of the Russian Academy of Sciences
Type:
Сonference article
Published:
27.12.2024
Subject area:
UDC 52
UDC 53
UDC 520
UDC 521
UDC 523
UDC 524
UDC 52-1
UDC 52-6
CSCSTI 41.00
CSCSTI 29.35
CSCSTI 29.31
CSCSTI 29.33
CSCSTI 29.27
CSCSTI 29.05
Russian Classification of Professions by Education 03.06.01
Russian Classification of Professions by Education 03.05.01
Russian Classification of Professions by Education 03.04.03
Russian Library and Bibliographic Classification 2
Russian Library and Bibliographic Classification 223
Russian Trade and Bibliographic Classification 614
Russian Trade and Bibliographic Classification 6135
BISAK SCI004000 Astronomy
BISAK SCI005000 Physics / Astrophysics
UDC 53
UDC 520
UDC 521
UDC 523
UDC 524
UDC 52-1
UDC 52-6
CSCSTI 41.00
CSCSTI 29.35
CSCSTI 29.31
CSCSTI 29.33
CSCSTI 29.27
CSCSTI 29.05
Russian Classification of Professions by Education 03.06.01
Russian Classification of Professions by Education 03.05.01
Russian Classification of Professions by Education 03.04.03
Russian Library and Bibliographic Classification 2
Russian Library and Bibliographic Classification 223
Russian Trade and Bibliographic Classification 614
Russian Trade and Bibliographic Classification 6135
BISAK SCI004000 Astronomy
BISAK SCI005000 Physics / Astrophysics
Language:
English
Keywords:
stars: symbiotic; individual: CI Cyg
Abstract (English):
The activity of the classical symbiotic star CI Cyg from 2006 to 2012 was studied based on the photometric and spectrophotometric data. The flux of the strongest spectral lines were calculated. It has been shown that the fluxes of H${\alpha}$, He I $\lambda$5876 lines with a low ionization potential were increased in the outburst. At the same time, the flux of lines with a high ionization potential of [Ne V] $\lambda$3426, [Fe VII] $\lambda$6087 lines were decreased or disappeared completely. In addition, during outbursts the molecular bands belonging to the cold component weakened and the ultraviolet excess behind the Balmer jump decreased or disappeared. At the maximum and close to it, only the emission lines H I, He I and Fe II were observed in the spectra. A comparison was made with the previous period of activity in 1971–1975. It is noted that both periods of activity have similar properties. In particular, a series of outbursts were observed, with each of the subsequent outburst being weaker than the previous one. In addition, the curve of eclipsing in the first outburst of the series was wider than the subsequent ones in both periods of activity. Besides, the brightness of the star weakened before the first flashes of the series.
The activity of the classical symbiotic star CI Cyg from 2006 to 2012 was studied based on the photometric and spectrophotometric data. The flux of the strongest spectral lines were calculated. It has been shown that the fluxes of H${\alpha}$, He I $\lambda$5876 lines with a low ionization potential were increased in the outburst. At the same time, the flux of lines with a high ionization potential of [Ne V] $\lambda$3426, [Fe VII] $\lambda$6087 lines were decreased or disappeared completely. In addition, during outbursts the molecular bands belonging to the cold component weakened and the ultraviolet excess behind the Balmer jump decreased or disappeared. At the maximum and close to it, only the emission lines H I, He I and Fe II were observed in the spectra. A comparison was made with the previous period of activity in 1971–1975. It is noted that both periods of activity have similar properties. In particular, a series of outbursts were observed, with each of the subsequent outburst being weaker than the previous one. In addition, the curve of eclipsing in the first outburst of the series was wider than the subsequent ones in both periods of activity. Besides, the brightness of the star weakened before the first flashes of the series.
Keywords:
stars: symbiotic; individual: CI Cyg
stars: symbiotic; individual: CI Cyg
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