Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975azh....52..515l&link_type=abstract
Astronomicheskii Zhurnal, vol. 52, May-June 1975, p. 515-520. In Russian.
Astronomy and Astrophysics
Astronomy
3
H Alpha Line, Nebulae, Radio Sources (Astronomy), Supernova Remnants, Astronomical Photography, Cygnus Constellation, Forbidden Bands, H Ii Regions
Scientific paper
Optical observations with a 125-cm reflector are reported for the nebula near gamma Cyg that has been identified with the supernova remnant DR 4. Photographs were taken in H-alpha as well as the forbidden lines of N II, S II, and O III; interferometric observations were made of the nebula and a nearby H II region in H-alpha as well as the 6584-A forbidden line of N II; and spectrograms of the nebula were obtained in the region between 6000 and 7000 A with dispersions of 25, 60, and 260 A/mm. Numerical values are given for the H-alpha emission, the ratios of other emissions to that of H-alpha, the radial and expansion velocities, and the average half-width of the H-alpha and forbidden N II (6584 A) lines across the nebula. It is shown that this nebula may not be a typical supernova shell like the Cygnus Loop, IC 443, or W 28, and that the recombination radio emission from DR 4 is caused by this nebula and not by the diffuse background.
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