On the nature of MWC 349

Details On the nature of MWC 349 On the nature of MWC 349

Aug 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...239..905h&link_type=abstract

Astrophysical Journal, Part 1, vol. 239, Aug. 1, 1980, p. 905-910.

Astronomy and Astrophysics

Astrophysics

39

Emission Spectra, Line Spectra, Stellar Spectra, Stellar Winds, Electron Scattering, H Alpha Line, H Ii Regions, Photosphere, Spectral Line Width, Stellar Mass Ejection, Wind Velocity

Scientific paper

Line profile observations of MWC 349 confirm the suggestion of Olnon (1975) that the compact H II region surrounding the star is a stellar wind. The broad wings on H-alpha are caused by electron-scattering redistribution; the appreciable Thomson optical depth in the wind indicates that the photosphere of the star is extended. The terminal velocity of the wind is about 50 km/s, extremely slow for mass ejection from an early-type star. It is suggested that the slow wind and extended photosphere can be reconciled with the radiatively driven wind theory of Castor, Abbott, and Klein (1975) if MWC 349 has a low effective surface gravity, possibly because the star is overluminous for its mass.

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