The ultraviolet spectrum of Beta Ori, B8 IA

Selvelli, P. L.; Crivellari, L.; Stalio, R.
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Astronomy and Astrophysics Supplement Series, vol. 27, Jan. 1977, p. 1-29. Research supported by the Consiglio Nazionale delle Ricerche.

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A Copernicus spectrum of the early-type supergiant Beta Ori, extending from 1010 to 1440 A with 0.2-A resolution and from 1710 to 3215 A with 0.4-A resolution, is described. Some 1137 absorption lines are identified, and equivalent widths and profiles are computed for selected features. It is found that: (1) the Ly-alpha line is the major feature over the entire spectrum; (2) 'metals' are mostly in the first and second state of ionization; and (3) only the resonance lines of Si III and Si IV are markedly blue-shifted by about 180 km/s, but there is no evidence of P Cyg profiles.