Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a...103....5b&link_type=abstract
Astronomy and Astrophysics, vol. 103, no. 1, Nov. 1981, p. 5-18.
Astronomy and Astrophysics
Astrophysics
17
B Stars, Balmer Series, Electron Scattering, Emission Spectra, Paschen Series, Stellar Envelopes, Black Body Radiation, Spectrum Analysis, Stellar Models, Stellar Spectra
Scientific paper
The intensities of hydrogen emission lines have been studied for a sample of 15 Be stars, with spectral types ranging from B0e to B5e, in order to test the validity of Sobolev's theory (1947) by comparing the observed and theoretical intensities of Balmer and Paschen emission lines. It is found that: (1) there is no agreement between observations and theory when electron collisions in the circumstellar envelope are neglected; (2) when electron collision in the envelope are taken into account, agreement can be found between observations and theory only for the hottest stars (B0e and B1e); and (3) no agreement is found for later spectral types of Be stars with Paschen emission lines. Possible causes of the disagreement between theory and observations are examined.
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