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The light history of AG Peg (HD 207757) is characterized by a ~3 mag brightening which took place during 1850-70 followed by a slow decline ever since. In recent times the V magnitude has shown variations between 7.7 and 8.8, and a semi–regular behaviour with maxima 600 to 700 days apart (Mattei 1981). The optical spectrum and its time variation was studied among others by Boyarchuk (1967) and Hutchings et al. (1975) who suggested the presence of a binary system consisting in an M type giant and a WN6 companion surrounded by a nebular region.
- Type
- Session II – Discussion on Individual Stars
- Information
- International Astronomical Union Colloquium , Volume 70: The Nature of Symbiotic Stars , 1982 , pp. 201 - 202
- Copyright
- Copyright © Reidel 1982
Footnotes
*
Since the original report of CD. Keyes has not arrived in time to be included in the Proceedings, a short abstract was prepared by the Editors partly based on notes taken during Keyes’ talk.
References
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Keyes, C.D., Plavec, M.J.: 1980, The Universe at Ultraviolet Wavelengths, Chapman, R.D. (ed.), NASA CP-217I, p. 443
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Mattei, J.A.: 1981, North American Workshop on Symbiotic Stars, Stencel, R.E. (ed.), JILA and University of Colorado, p. 31
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