Infrared photometry of five long-period binaries

We present and discuss JHKLM photometry for five long-period binaries (VV Cep, ZZ CMi, WY Gem, ε Aur, and ζ Aur). The IR radiation from WY Gem may contain a component with a period of ～430 days, attributable to temperature pulsations of an M supergiant. The 3.5-and 5-μm radiation from the eclipsing binary ε Aur outside the eclipse exhibits excess (relative to the light from an F supergiant) fluxes which correspond to the emission from a cool source with a temperature of ～1000 K. For the eclipsing binary Aur, we present the hitherto unpublished results of our optical and IR photometry during 1982–1985, when a primary eclipse was observed in the system.