3-13 /um Spectroscopy of Nova Cassiopeiae 1993

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We report 3 - 13 /um spectroscopy (resolution of 30 - 130) from the Infrared Telescope Facility in Hawaii. On Dec 14.3 1994 UT, the nova showed a strong infrared excess with IR magnitudes of L = 6.6 177 0.2, M = 5.5 177 0.07 and N = 1.8 177 0.15. The continuum between 8 and 13 /um falls off more steeply than a Planck function. The spectrum displayed two prominent emission features, one at 3.4 /um (197 0.25 /um wide) and the other at 11.3 /um (197 0.4 /um wide.) If the 3.4 /um and 11.3 /um have the same or similar origins as those that cause the 3.4 /um and 11.3 /um UIR features (Unidentified InfraRed), the 8.6 /um feature which always accompanies the later two is noticeably absent here.

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