We present recent data of absolute measurements of flux emmitted in the visible continua of some galactic Wolf-Rayet stars, carried out by means of a two-channel scanner built up cooperatively by the Observatoire de Lyon and the Laboratoire d'Astronomie Spatiale. Our measurements lead to the determination of stellar angular diameters which enable us to compute log L∗/L⊙ L∗/L⊙ and to locate the WR stars in the HR diagram: The WR stars are cooler than the zero age main sequence (ZAMS) and the WN7, WN8 types appear more luminous than other subclasses. The stellar wind terminal velocities, V∞ V∞ , deduced from the empirical relation of the effective temperatures by Underhil1(1983) and V∞ V∞ adopted from the work of Willis(1982) show about 2,000km/s. We derived the rate of mass loss for the program stars from the formula, ˙ M=ε(Teff)L/V∞⋅c M˙=ε(Teff)L/V∞⋅c by using the obtained effective temperatures, luminosities and V∞ V∞ in this work. Their values range from ˙ M=1.4×10−5 M˙=1.4×10−5 to ˙ M=5.8×10−5 ˙ M⊙/yr M˙=5.8×10−5M˙⊙/yr .

The absolute measurements of fluxes in the region λ λ 3 , 100 − 8 , 090 |AA emitted in the visible continua of some galactic Wolf-Rayet stars are presented. These observations were made by a two-channel scanner which was built up cooperatively by the Observatoire of Lyon and the Laboratoire d'Astronomie Spatiale. The fluxes, dereddened from those data, were combined with IUE and ANS ultraviolet measurements. These fluxes were compared with those of LTE plane paralleled model atmospheres of Kurucz (1979) and were also integrated in order to derive effective temperatures and bolometric corrections for the program stars. The derived effective temperatures and bolometric corrections for the stars were in the range of 25, 000 K ∼ 32,700 K, and of − 2.5 mag . ∼ − 3.7 mag ., respectively.