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FG sagittae, a test of the theory of evolution of double shell source stars

Published online by Cambridge University Press:  04 August 2017

Yu. A. Fadeyev
Yu. A. Fadeyev*
Affiliation:
Astronomical Council, USSR Academy of Sciences

Extract

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FG Sge is a unique stellar object possessing a number of unusual properties which are as follows: (1) FG Sge is a core of a planetary nebula, (2) at least since 1894 this star has crossed the HR diagram from the left to the right, (3) the atmosphere of FG Sge was enriched in s-elements, (4) FG Sge is a pulsating variable the period of which progressively increases from 15 days in 1962 to 110 days in 1980.

Type
III. BINARITY, PULSATION, ROTATION AND MIXING
Information
Symposium - International Astronomical Union , Volume 105: Observational Tests of the Stellar Evolution Theory , 1984 , pp. 471 - 473
Copyright
Copyright © Reidel 1984 

References

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