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Optical and Infrared Observations of the Peculiar Planetary Nebula He2-442

Published online by Cambridge University Press:  19 July 2016

V.P. Arkhipova ,
V.F. Yesipov  and
B.F. Yudin
V.P. Arkhipova
Affiliation:
Sternberg Astronomical Institute, 117234 Moscow, USSR
V.F. Yesipov
Affiliation:
Sternberg Astronomical Institute, 117234 Moscow, USSR
B.F. Yudin
Affiliation:
Sternberg Astronomical Institute, 117234 Moscow, USSR

Abstract

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Infrared observations of He2-442 carried out at Crimean Station of Sternberg Institute during 1984–1986 revealed that in the past ten years the 1–10 μm flux has decreased by factor ∼ 2.4, the colour temperature determined from (K-L) index has decreased by ∼ 300 K, and the infrared energy distribution has been changed also essentially. However, the definite cool star features, for example, Mira-like variability was not yet recorded.

Type
I. Observational Data on Nebulae
Information
Symposium - International Astronomical Union , Volume 131: Planetary Nebulae , 1989 , pp. 54
Copyright
Copyright © Kluwer 1989