Observations of the diffuse gaseous nebulae Barnard Loop and IC 434 at decametric wavelengths

Details Observations of the diffuse gaseous nebulae Barnard Loop and IC 434 at decametric wavelengths Observations of the diffuse gaseous nebulae Barnard Loop and IC 434 at decametric wavelengths

Jun 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992azh....69..489a&link_type=abstract

Astronomicheskii Zhurnal (ISSN 0004-6299), vol. 69, no. 3, May-June 1992, p. 489-496. In Russian.

Astronomy and Astrophysics

Astronomy

Decametric Waves, H Ii Regions, Interstellar Gas, Nebulae, Radio Emission, Brightness Distribution, Electron Energy, Radio Telescopes, Thermal Emission

Scientific paper

Observations of the extended HII regions Barnard Loop and IC 434 were carried out with the radio telescope UTR-2 at five frequencies between 12.6 and 25 MHz. The resolution of the telescope was 28 x 45 arcmin at 25 MHz. The maps of brightness distribution at the direction of the HII regions are presented. The physical parameters of the nebulae have been obtained. The electron temperature of Barnard Loop is 5900 K, the optical depth is 0.4 at 25 MHz, emission measure is 200 pc cm exp -6. The parameters are 6000 K, 2.7 and 1300 pc cm exp -6, respectively, for IC 434.

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