Ring nebulae around Of stars - Observations of S 119 and the central star 68 Cygni

Details Ring nebulae around Of stars - Observations of S 119 and the central star 68 Cygni Ring nebulae around Of stars - Observations of S 119 and the central star 68 Cygni

Oct 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982sva....26..582e&link_type=abstract

(Astronomicheskii Zhurnal, vol. 59, Sept.-Oct. 1982, p. 965-974) Soviet Astronomy (ISSN 0038-5301), vol. 26, Sept.-Oct. 1982, p.

Astronomy and Astrophysics

Astronomy

5

O Stars, Planetary Nebulae, Interferometry, Light Curve, Radio Spectra, Stellar Winds, Variable Stars

Scientific paper

Interferometric, spectrographic, and radio observations of the nebula S 119 are reported, together with electrophotometric data for Cygni 68. The shell expansion of S 119 was examined in the H-alpha and forbidden N II line using a Fabry-Perot interferometer. Spectral emissions in the 6000-7000 A region were studied photometrically with a 4 A resolution. The radio survey was performed at 408 and 1400 MHz for the central source and 102 MHz for the integral flux from the central region. S 119 was concluded to be a shell with a radius of 17 pc located at a distance of 700 pc. The radio emission is thermally initiated, and a mean density in the diffuse filaments was no more than 45/cu cm. The total shell mass is from 100-500 solar masses, accompanied by a velocity approaching 15 km/sec. Ionization is produced from a central star and the shell structure is influenced by the Cygni 68 stellar wind, which has a strength of 2.5 x 10 to the 35th erg/sec. Further observations are recommended for identifying a compact companion in Cygni 68.

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