Mass loss from P Cygni. II - an equivalent two-level-atom approach

Details Mass loss from P Cygni. II - an equivalent two-level-atom approach Mass loss from P Cygni. II - an equivalent two-level-atom approach

Aug 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...224..193k&link_type=abstract

Astrophysical Journal, Part 1, vol. 224, Aug. 15, 1978, p. 193-197.

Astronomy and Astrophysics

Astrophysics

22

Astronomical Spectroscopy, Balmer Series, Stellar Envelopes, Stellar Mass Ejection, Cygnus Constellation, Emission Spectra, H Lines, Spectral Line Width, Stellar Models

Scientific paper

The formation of the Balmer-line spectrum of P Cygni is investigated by using an equivalent two-level-atom formalism. This approach eliminates the artificial distinction between a continuum-emitting core and line-emitting envelope, and also does not employ a supersonic approximation in the line-transfer problem. The results support the conclusion that a velocity distribution similar to the linear law, v(r) is proportional to r, exists in the envelope and can account for the observed Balmer lines. A more complicated velocity law derived from infrared continuum measurements does not give a good representation of the Balmer lines.

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