Abstract
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.
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© 1989 International Astronomical Union
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Arkhipova, V.P., Yesipov, V.F., Yudin, B.F. (1989). Optical and Infrared Observations of the Peculiar Planetary Nebula HE2-442. In: Torres-Peimbert, S. (eds) Planetary Nebulae. International Astronomical Union / Union Astronomique Internationale, vol 131. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-0865-9_11
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DOI: https://doi.org/10.1007/978-94-009-0865-9_11
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