[en] The paper presents brightness temperatures of the supernova remnant HB 9 measured with the UTR-2 radio telescope at the frequencies from 12,6 to 25 MHz. The spectral index of the source below 1 GHz is 0,43±0,05. Below 30 MHz, th spectrum shows a drop due to absorption in ionized hydrogen around or within the remnant. The optical depth of the hydrogen is 0,05±0,03 at 25 MHz and the electron density is 0,8 cm^-3. The volume density of radiation in the shell is about 7,5x10^-37 erg/(cm³xsxHz) at 25 MHz and the magnetic field strength is roughly 2,5x10^-5 Oe. The total energy of relativistic particles and the magnetic field in the supernova remnant is about 10⁵⁰ erg

[en] Observations of the ionized hydrogen region NGC 1499 have been carried out with the radio telescope UTR-2 at frequencies 12.6, 14.7, 16.7, 20 and 25 MHz. The half-power resolution of the instrument to zenith is 28' X 34' at 25 MHz. The average volume density of the non-thermal radio emission between the Sun and the nebula (1.75 X 10^-40 W m^-3 Hz^-1 ster^-1 at 25 MHz), the electron temperature of the H II nebula (Tsub(e) = 4400 K), the measure of emission (ME = 1500 cm^-6 pc) and other parameters have been obtained. Maps of brightness distribution over the source are presented for each observation frequency. The results are compared with previously obtained data. (Auth.)

[en] The results of observations of the Rosette emission nebula NGC 2237 with the radio telescope UTR-2 at frequencies 12.6, 14.7, 16.7, 20.0 and 25.0 MHz are given in the shape of contours of constant brightness temperature. The half-power beamwidth of the telescope to zenith at 25.0 MHz was 28'x38'. Density weighted mean values for the non-thermal radio emissivity between the Sun and the source (7.9x10^-41 W m^-3 Hz^-1 ster^-1 at 25.0 MHz) and the ratio of the intensity of emissivity generated before the area and the intensity of galactic radio emissivity appearing beyond the area equal to 1.3 have been obtained. The electron temperature Tsub(e)=3600 K, the optical depth (about ten at 25 MHz) the measure of emission (ME=3500 cm^-6 pc), the electron density Nsub(e)=8 cm^-3 and the nebular mass 16.6x10⁺³ solar masses have been determined. A comparison with other observation results has been made. (Auth.)

[en] Observations of the regions of ionized hydrogen in the vicinity of the Galaxy anticentre contained nebulae IC 405 and IC 410 were carried out with the radio telescope UTR-2 at five frequencies between 12.6 and 25 MHz, the resolution being 0. deg 5 to 1 deg. The H II regions are seen in absorption. The average volume density of the nonthermal interstellar radiation at 12.6 MHz is 135 Kxpc^-1 in the direction of IC 405 and 37 Kxpc^-1 in the direction of IC 410. The kinetic temperature of IC 410 is equal to 11000 K, and the electron concentrations is approximately 12 cm^-3. Electron temperature is calculated for the IC 410 source. The obtained value essentially exceeds the known values

[en] The H II region NGC 2264 has been observed with the UTR-2 radio telescope at 12.6, 14.7, 16.7, 20, 25 MHz. The half-power resolution at 25 MHz was 28' x 36'. The brightness distribution is mapped at each frequency; the nebula appears distinctly in absorption against a brighter nonthermal radio background. Several physical parameters are determined for the H II region: T_e = 4100 +- 2500 ₀K, emission measure 275 cm^-₆ pc, n_e = 2.7 cm^-₃. The average nonthermal radio-emission density in the medium between the sun and NGC 2264 at 12.6 MHz is 108 +- 20 ₀K/pc

[en] Observations of the HII region NGC 2264 have been carried out with the radio telescope UTR-2 at the frequencies 12.6, 14.7, 16.7, 20, 25 MHz. The half-power resolution of the instrument is 28'x36' at 25 MHz. The maps of brightness distribution over the source are presented for each observation frequency. The HII region is seen reliably in absorption at all frequencies. The electron temperature of the HII nebula is 4100+-2500 K, the emisssion measure is 275 cm^-6 pc, the electron density is 2.7 cm^-3. The average volume density of the non-thermal radio emission between the Sun and the nebula is 108+-20 K pc^-1 at 12.6 MHz

[en] Attempts to observe effects of absorption of background decameter radiation (at ß = 14.7, 16.7, 20 MHz) by Heiles' Cloud 2 place upper limits of roughly-equal10^-₂ cm^-₆ pc on its emission measure and roughly-equal10^-₁ cm^-₃ on its electron density

[en] The effect of absorption of the decametric background emission (at the frequencies 14.7, 16.7, 20 MHz) by the Heiles' dust Cloud 2 is observed. An upper limits on the emission measure of the Cloud approximately 10^-2 cm^-6 pc and the electron density approximately 10^-1 cm^-3 are obtained