Ring nebulae around Wolf-Rayet stars - Filaments and diffuse matter in NGC 6888

Details Ring nebulae around Wolf-Rayet stars - Filaments and diffuse matter in NGC 6888 Ring nebulae around Wolf-Rayet stars - Filaments and diffuse matter in NGC 6888

Jun 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980sval....6..193l&link_type=abstract

(Pis'ma v Astronomicheskii Zhurnal, vol. 6, June 1980, p. 350-353.) Soviet Astronomy Letters, vol. 6, May-June 1980, p. 193-195.

Astronomy and Astrophysics

Astronomy

9

Diffuse Radiation, Filaments, Hot Stars, Nebulae, Stellar Envelopes, Wolf-Rayet Stars, Forbidden Transitions, Interferometry, Interstellar Gas, Neutron Stars, Spectral Line Width, Stellar Winds, Supernova Remnants, Thermal Radiation

Scientific paper

New interferometric observations of the diffuse emission of NGC 6888 are reported. The halfwidths of the H alpha and 6584-A forbidden N II lines emitted by the smoothly distributed interfilament gas are 250 + or - 50 km/sec, 210 + or - 60 km/sec, respectively, values five times the halfwidth of these lines in the filaments. The contrasts of the filaments above the diffuse background are found to be 12 + or - 3, and 6 + or - 3. The nature of the ring nebulae observed around Wolf-Rayet stars is discussed.

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