Abstract
Using an Infrared photometer with InSb photovoltaic detector at the 182cm Copernicus telescope of the Asiago Observatory, Italy, we have measured theJHKL’ M magnitudes of 12 IRC sources 7 of which are very late type stars with [ICIT -K] greater than 5 magnitudes. These data have been fitted to blackbody distributions to obtain their effective temperatures. The present data, in combination with other available photometric data at longer wavelengths seems to indicate excess emission at 11 μm from sources 10066, 10510 and 10234, and at 19.8 μm from source 20052. The source 60098 shows extreme infrared colours.
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Work carried out when the first author was a guest scientist at Max Planck-Institut für Extraterrestrische Physik,Garching FRG.
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Iyengar, K.V.K., Strafella, F., Lorenzetti, D. et al. Near infrared observations of some of the IRC sources. J Astrophys Astron 3, 451–463 (1982). https://doi.org/10.1007/BF02714885
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DOI: https://doi.org/10.1007/BF02714885