, Volume 61, Issue 3, pp 310–323 | Cite as

Photometric and Spectral Studies of the Object EG And

  • I. N. KondratyevaEmail author
  • F. K. Rspaev
  • I. V. Reva
  • M. A. Krugov

The symbiotic object EG And consists of a giant star (M4III) and a white dwarf. Numerous studies of this object show that its light curve has two minima. There are different hypotheses regarding the source of the secondary minimum, but the problem has not yet been solved. In this paper we present data from photometric and spectral observations of EG And during 2009-2018: B, V, and R magnitudes in the Johnson system and fluxes in the Hβ and Hα emission lines. An analysis of these data showed that the emission fluxes correlate with the orbital phase. The highest fluxes are observed near the secondary minimum. At the same time, emission fluxes are still observed in the primary minimum but attenuated by roughly a factor of 7-10. This indicates that the size of the ionized zone exceeds that of the giant star. On the whole, the light curve for 2009-2018 is consistent with previous photometric data. Rapid (over a few minutes) fluctuations in the brightness of this object are detected in the V and R bands with amplitudes of ~0m.15 and 0m.35, respectively.


variable stars symbiotic stars emission lines individual objects— EG And 


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© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  • I. N. Kondratyeva
    • 1
    Email author
  • F. K. Rspaev
    • 1
  • I. V. Reva
    • 1
  • M. A. Krugov
    • 1
  1. 1.Fesenkov Astrophysical InstituteAlmatyKazakhstan

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