Abstract
view Abstract Citations (11) References (7) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS A model for P Cygni based on the He I spectrum. Oegerle, W. R. ; van Blerkom, D. Abstract Recent work on the interpretation of hydrogen emission lines from P Cygni has led to contradictory models of its atmosphere. In order to resolve the problem, we have constructed a model for He i emission in an accelerating envelope. The statistical equilibrium equations are solved at several points in the envelope using a 36 level neutral helium atom with continuum and the escape probability method to simplify the transfer of radiation. The resulting line profiles agree quite well with the observed lines for a mass loss rate of 2 x 10-6 M0 yr -`. The unusual behavior of helium lines, noted by Adams and Merrill, in which absorption components of lines in the same series have quite different displacements from line center, is a natural consequence of our model. The evidence of the radial velocity-excitation potential relation together with our line profile results point strongly to an accelerating flow in the region of P Cygni's envelope where the He I spectrum is formed. Subject headings: line profiles - stars: atmospheres - stars: circumstellar shells - stars: emission-line Publication: The Astrophysical Journal Pub Date: September 1976 DOI: 10.1086/154626 Bibcode: 1976ApJ...208..453O full text sources ADS | data products SIMBAD (1)
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