Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...230..380d&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 230, no. 2, April 1990, p. 380-388.
Astronomy and Astrophysics
Astrophysics
2
B Stars, Early Stars, Electron Scattering, H Alpha Line, Periodic Variations, Stellar Envelopes, Balmer Series, Emission Spectra, Stellar Atmospheres, Stellar Luminosity, Stellar Spectra
Scientific paper
It is shown that the observed variations of visual brightness of the Be stars HR 2825 and HR 4930 are clearly correlated to variations of the widths of their H-alpha emission-line wings. Both effects can be attributed to the influence of Thomson scattering in the circumstellar envelopes of these stars. Observed photometric variations are quantitatively analyzed in terms of variations of emission measures of the envelopes and are found to be connected with important changes of envelope geometry and electron density. Plausible order-of-magnitude estimates for electron column densities and resulting values of electron densities and of envelope masses are presented and discussed.
Dachs Joachim
Rohe Christian
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