Electron scattering in the expanding atmosphere of P Cygni.
Abstract
High signal4onoise observations of hydrogen- and helium-line profiles in the spectrum of P Cyg show a new feature-broad weak emission wings extending to :1: 1500 km 1 from the line center. The wings are attributed to electron scattering in the extended atmosphere above the line formation region. A simple model calculation shows that an optical depth Te 0.2 for the electron scattering layer will fit the Ha observations. The broad wings are stronger for the He I lines and Te 0.4 is suggested. Key words: broad emission lines-stellar atmospheres-P Cygni stars-electron scattering
- Publication:
-
Publications of the Astronomical Society of the Pacific
- Pub Date:
- October 1978
- DOI:
- 10.1086/130376
- Bibcode:
- 1978PASP...90..520B
- Keywords:
-
- B Stars;
- Electron Scattering;
- Emission Spectra;
- Line Spectra;
- Stellar Atmospheres;
- Stellar Spectrophotometry;
- H Lines;
- Helium;
- Optical Thickness;
- Spectral Line Width;
- Stellar Models;
- Astrophysics;
- Atmospheres:P Cygni Stars;
- Line Profiles:P Cygni Stars;
- Scattering:Stellar Atmospheres