Spectroscopic Orbit of the Eclipsing Symbiotic Star CH Cyg

  • M. Mikołajewski
  • R. Szczerba
  • T. Tomov
Part of the Astrophysics and Space Science Library book series (ASSL, volume 145)


Mikołajewski et al. (1987) quoted convincing arguments that CH Cygni is eclipsing binary system:
  1. 1

    Photometric minima in U light were separated by 5700÷5780 days which is very close to the spectroscopic period (P=5750±250d) found by Yamashita and Maehara (1979) .

  2. 2

    Variations of Hβ and Hγ profiles during both minima can be succesfully interpreted as an eclipse of a rotating disk or envelope from which these profiles originate (see also Fernie et al., 1986).

  3. 3

    The flickering activity was absent during the 1985 minimum while observed before and after the minimum.

  4. 4

    Only forbidden lines were unaffected by the minimum. Recently, additional arguments for the eclipsing nature of CH Cygni have been found:

  5. 5

    Deep minimum in the IUE integrated flux was coincided with the minimum detected in U light (Mikołajewska et al., 1987a).

  6. 6

    Changes of Balmer decrement and Balmer continuum emission measure suggest a presence of relatively small dense region occulted during the minimum and extended low density region coinciding with the radio jets (Mikołajewska et al., 1987b).

  7. 7

    Radial velocity of the jet spatially resolved by Solf (1987) in the [OIII] 5007 line suggests the jet is practically perpendicular to the line of sight.



  1. Fernie J.D., Lyons R., Beattie B., Garrison R.F.:1986, IBVS No. 2935 Google Scholar
  2. Mikołajewska J., Selvelli P.L., Hack M. : 1987a, submitted to Astron. Astrophys.Google Scholar
  3. Mikołajewska J., Mikołajewski M., Biernikowicz R., Selvelli P.L., Turło Z.:1987b, in proceedings of IAU Symp. No. 122, Reidel Co., p. 487Google Scholar
  4. Mikołajewski M., Tomov T., Mikołajewska J., : 1987, Astrophys. Sp. Sci. 131 , 733ADSCrossRefGoogle Scholar
  5. Solf J.:1987, Astron. Astrophys., 180, 207ADSGoogle Scholar
  6. Yamashita Y., Maehara H.:1979, Publ. Astron. Soc. Japan 31 , 307Google Scholar

Copyright information

© Kluwer Academic Publishers 1988

Authors and Affiliations

  • M. Mikołajewski
    • 1
  • R. Szczerba
    • 2
  • T. Tomov
    • 3
  1. 1.Institute of AstronomyUMKToruńPoland
  2. 2.N. Copernicus Astronomical CenterToruńPoland
  3. 3.Rozhen ObservatoryBulgarian Academy of SciencesBulgaria

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