Stellar Lyman alpha and Lyman beta profiles

Details Stellar Lyman alpha and Lyman beta profiles Stellar Lyman alpha and Lyman beta profiles

Sep 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977a%26a....60..211v&link_type=abstract

Astronomy and Astrophysics, vol. 60, no. 2, Sept. 1977, p. 211-219.

Astronomy and Astrophysics

Astrophysics

4

Early Stars, Lyman Alpha Radiation, Lyman Beta Radiation, Stellar Spectra, Ultraviolet Spectra, Oao 3, Radiation Spectra, Stellar Temperature, Thermodynamic Equilibrium, Ultraviolet Photometry

Scientific paper

Measurements of Lyman-alpha and Lyman-beta profiles, as obtained by the Copernicus satellite for 20 early-type stars, are reported. The profiles are compared with theoretical profiles computed using unblanketed non-LTE model atmospheres. The Ly-alpha profiles are found to be systematically broader than the Ly-beta profiles, contrary to the theoretical predictions; this discrepancy is ascribed to line-blanketing effects.

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