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UV and optical spectroscopy of CH Cygni in 1980–86

Published online by Cambridge University Press:  04 August 2017

J. Mikołajewska ,
M. Mikołajewski ,
R. Biernikowicz ,
P.L. Selvelli  and
Z. Turło
J. Mikołajewska
Affiliation:
1 Institute of Astronomy, UMK, Torun, Poland
M. Mikołajewski
Affiliation:
1 Institute of Astronomy, UMK, Torun, Poland
R. Biernikowicz
Affiliation:
1 Institute of Astronomy, UMK, Torun, Poland
P.L. Selvelli
Affiliation:
2 Astronomical Observatory, Trieste, Italy
Z. Turło
Affiliation:
3 Astrophysical Laboratory, CAMK-PAN, Torun, Poland

Extract

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CH Cyg is a binary (P∼5750 days) consisting of a normal M6-7 giant and an unseen companion. During active phase its spectrum is similar to that of a symbiotic star - the strong B-A continuum and numerous low-excitation emission lines dominate the visual and UV spectrum. The last outburst, started in 1977, is conspicuous by the highest brightness level observed since monitoring begun in 1935. In mid 1984, a drop in brightness was accompanied by large continuum and emission line changes and correlated with a radio outburst and two expanding jets appearance (Taylor et al. 1985).

Type
Symbiotic Stars
Information
Symposium - International Astronomical Union , Volume 122: Circumstellar Matter , 1987 , pp. 487 - 489
Copyright
Copyright © Reidel 1987 

References

Drake, S.A., Ulrich, R.K., 1980, Ap. J. Suppl., 42, 351.Google Scholar
Farragiana, R., Hack, M., 1980, IBVS No. 1861.Google Scholar
Leahy, D., Taylor, A.R., 1986, preprint.Google Scholar
Mikołajewska, J., Selvelli, P.L., Hack, M., 1987, IAU Coll. No. 93.Google Scholar
Mikołajewski, M., Tomov, T., Mikołajewska, J., 1986, ibid. Google Scholar
Selvelli, P.L., Hack, M., 1985, Astronomy Express, 1, 115.Google Scholar
Taylor, A.R., Seaquist, E.R., Mattei, J.A., 1986, Nature, 359, 58.Google Scholar