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The Photometric and Spectral Variability of the Planetary Nebula IC 4997

Published online by Cambridge University Press:  19 July 2016

E.B. Kostyakova
E.B. Kostyakova*
Affiliation:
Sternberg State Astronomical Institute, Moscow, USSR

Abstract

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Among the planetary nebulae showing noticeable long-time variations of brightness (see our foregoing contributed paper; Astron. Circ. USSR, No. 1430, 3, 1986, and earlier publications) the young stellar planetary IC 4997 is the most prominent. Our photoelectric observations revealed its rather surprising behaviour. During 1968–85 its total UBV-brightness was monotonously decreasing, especially in filter V: the reduction of the value Δv amounted ∼ 0m.5–0m.6. The colour indices of the planetary showed that during the observation period the object as a whole, became definitely bluer. In 1985–86 our observations revealed an unexpected stop of mentioned brightness decrease, but in 1987 the object appeared to start brightening.

Type
I. Observational Data on Nebulae
Information
Symposium - International Astronomical Union , Volume 131: Planetary Nebulae , 1989 , pp. 56
Copyright
Copyright © Kluwer 1989