The Wolf-Rayet nebula NGC 6888 as a pressure driven bubble

Details The Wolf-Rayet nebula NGC 6888 as a pressure driven bubble The Wolf-Rayet nebula NGC 6888 as a pressure driven bubble

Nov 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988mnras.235..391m&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 235, Nov. 15, 1988, p. 391-402.

Astronomy and Astrophysics

Astronomy

33

Astronomical Spectroscopy, H Alpha Line, Wolf-Rayet Stars, Continuous Radiation, Emission Spectra, Far Infrared Radiation, Infrared Astronomy Satellite, Stellar Winds, Velocity Distribution

Scientific paper

Profiles of the H-alpha and forbidden N II emission lines have been obtained across the major axis of the Wolf-Rayet ring nebula NGC 6888 with the Manchester echelle spectrometer combined with the Isaac Newton Telescope. Although triple profiles are found, this nebula is shown to approximate to a shell of radius 3 pc expanding at 85 km/s. The ionized mass in the shell is 3.5 + or - 1.2 solar masses. IRAS survey maps also reveal a shell of neutral material containing 40 solar masses, assuming the far-infrared continuum emission from warm dust dominates the line emission. If it is assumed that this mass is also expanding at 85 km/s, it is shown that the nebula is a pressure driven bubble, which conserves the kinetic energy of the driving stellar wind.

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