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Mass loss from alpha Cyg /A2Ia/ derived from the profiles of low excitation Fe II linesThe 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).
Document ID
19820039565
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Hensberge, H.
(Vrije Univ. Brussels, Belgium)
De Loore, C.
(Brussel, Vrije Universiteit Brussels, Belgium)
Lamers, H. J. G. L. M.
(Laboratorium voor Ruimte-Onderzoek Utrecht, Netherlands)
Bruhweiler, F. C.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 10, 2013
Publication Date
February 1, 1982
Publication Information
Publication: Astronomy and Astrophysics
Volume: 106
Issue: 1, Fe
Subject Category
Astrophysics
Accession Number
82A23100
Distribution Limits
Public
Copyright
Other

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