Spectral line profiles from spherical shells

Details Spectral line profiles from spherical shells Spectral line profiles from spherical shells

Apr 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...120....6w&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 120, no. 1, April 1983, p. 6-14. Sponsorship: Deutsche Forschungsgemeinschaft.

Astronomy and Astrophysics

Astrophysics

23

H Alpha Line, Late Stars, Spectral Line Width, Stellar Envelopes, Stellar Spectrophotometry, T Tauri Stars, B Stars, Balmer Series, Interstellar Extinction, Orion Nebula, Spectral Energy Distribution, Stellar Evolution, Stellar Mass Accretion, Stellar Mass Ejection

Scientific paper

The authors study line profiles formed in spherical, radially thin shells. They investigate the effects of the shell dimensions and line formation parameters on the profiles and show that Type III P Cygni profiles can easily be formed in this framework. The authors demonstrate that the apparent contradiction caused by the simultaneous presence in the spectra of YY Orionis stars of a Type III P Cygni profile at Hα and inverse P Cygni profiles at the higher Balmer lines can be resolved if the Balmer lines arise in a shell detached from the star. Some physical implications of this new picture are briefly discussed.

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