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Spectroscopic Orbit of the Eclipsing Symbiotic Star CH Cyg

Published online by Cambridge University Press:  12 April 2016

M. Mikołajewski ,
R. Szczerba  and
T. Tomov
M. Mikołajewski
Affiliation:
Institute of Astronomy, UMK, Toruń, Poland
R. Szczerba
Affiliation:
N. Copernicus Astronomical Center, Toruń, Poland
T. Tomov
Affiliation:
Rozhen Observatory, Bulgarian Academy of Sciences, Bulgaria

Extract

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

  1. 1. Photometric minima in U light were separated by 57004÷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.

Type
Session 3. Physics of Individual Objects
Information
International Astronomical Union Colloquium , Volume 103: The Symbiotic Phenomenon , 1988 , pp. 221 - 222
Copyright
Copyright © Kluwer 1988

References

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