Fig. 2
Spectrum of HD 50975 retrieved from IUE archive in the far ultraviolet region where radiation of the hot secondary star dominates. Four standard stars of spectral types between B0.5 and B3 are presented for comparison purposes. The profiles of Lyman α line at 1215 Å calculated using atmospheric models with Teff = 17 000 (solid line) and 25 000 K (dashed line) are shown.
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