Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...106..137h&link_type=abstract
Astronomy and Astrophysics, vol. 106, no. 1, Feb. 1982, p. 137-150.
Astronomy and Astrophysics
Astrophysics
10
Photosphere, Resonance Lines, Stellar Mass Ejection, Stellar Spectra, Stellar Winds, Ultraviolet Spectra, Absorption Spectra, Cygnus Constellation, Iron, Line Spectra, Spectrum Analysis, Stellar Models
Scientific paper
The low-excitation Fe II lines in the spectral region 2000-3000 A are studied in the spectrum of alpha-Cyg. The profiles of the resonance lines are described by four representative parameters, and a preliminary model is derived from the dependence of these parameters on theoretical line strength, taking into account the influence of blending photospheric lines in an overall and qualitative way. At least 11% of all iron in the wind is once ionized, unless a non-thermal heating source enhances the fraction Fe(++) without destroying much Al(+). It is shown that the contribution of blending photospheric absorption lines to weaker P Cygni profiles has been previously largely underestimated. The mass loss rate corresponding to the model is derived, and is smaller by a factor of 500 than the one derived from the infrared excess by Barlow and Cohen (1977).
Bruhweiler Fred C.
de Loore Camiel
Hensberge Herman
Lamers Henny J. G. L. M.
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