Investigation of radiosources of the second galactic quadrant from the Kallas and Reich survey at 7.6 and 31.3 cm wavelengths.

The RATAN-600 telescope was used to investigate 69 of 71 unidentified extended sources and 11 compact sources with flat spectra from the survey of the galactic plane at 21 cm wavelength made by Kallas and Reich in 1980 on the Bonn 100-m radio telescope (KR survey). It is shown that 23 sources are not extended, i.e., they show a size less than 1'. These sources have an average spectral index α = -1.03 and apparently belong to an extragalactic population. Twenty-five sources showed a two-component and seven a three-component structure. Apparently, the majority of these sources are also extragalactic. KR58 is a compact planetary nebula NGC 7354. Twelve sources have a broad extended structure. Four of them - KR4, KR6, KR140, and KR198 - have flat spectra and, apparently, are optically thin H II regions. Eight sources - KR48, KR74, KR114, KR171, KR180, KR184, KR191, and KR197 - have an extended structure and a nonthermal spectrum. Moreover, KR171, KR180, and KR191 have compact sources within the extended structure. These eight sources may be unidentified galactic supernova remnants. Eight of the 11 compact sources are apparently H II regions.