Observations of (S III) emission from Galactic radio sources - The detection of distant planetary nebulae and a search for supernova remnant emission

Narrow-band near-infrared imaging observations at wavelengths corresponding to [S III] (λλ9069,9532) have been carried out at the MDM 1.3 m telescope for twenty-three radio sources near the Galactic plane in an attempt to detect emission associated with nebulae marking the endpoints of stellar evolution―i.e., supernova remnants and planetary nebulae (PNe). While none of the known remnants or remnant candidates were detected, ten of the eleven PN candidates from a new radio imaging survey of the Galactic plane were clearly seen in the [S III] (λ9532) line, even in cases for which nothing was visible at the candidate position on the Palomar Sky Survey