Abstract:
From a measurement of the equivalent width of H alpha in the star gamma 1 Velorum, it is found that My (gamma1 Vel)=-3.1. Assummg gamma 1 and 2 Velorum are at the same distance, a distance modulus of 7.4 magnitudes for gamma., Velorum is obtained. From a study of the absorption lines of the 091 component and the emission lines in the infra-red of the We8 component the difference in magnitude between
the two components is found to be about one magnitude. The 0 component is brighter and the derived
magnitudes are Mv (WC8+09I)=- 5.6, MT (091)=
-5.2 and Mv (WC8)=-4.2.