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Symbiotic Star AG Pegasi - Retrospect and Prospects

Published online by Cambridge University Press:  12 April 2016

D. Chochol
D. Chochol*
Affiliation:
Astronomical Institute, Slovak Academy of Sciences 059 60 Tatranská Lomnica, Czechoslovakia

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Symbiotic star AG Peg (HD 207757), which is still declining from the outburst in the last century, appears to be related to the very slow RT Serpentis type novae: binary stars consisting of a cool M giant and a hot component, which underwent outburst.

AG Peg was ninth magnitude star before the year 1850. Then it slowly rised in brightness and reached fifth magnitude in 1885. After the sudden drop of brightness in 1892 due to the dust formation in expanding envelope, the star returned to the sixth magnitude and then it was continuously decreasing in brightness (Lundmark, 1921; Rigollet, 1947; Belyakina, 1968). Nowadays the decrease of brightness is 0.021 mag/yr (Fernie, 1985).

Type
Session 3. Physics of Individual Objects
Information
International Astronomical Union Colloquium , Volume 103: The Symbiotic Phenomenon , 1988 , pp. 251 - 255
Copyright
Copyright © Kluwer 1988

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