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    Light Curve Analysis of Hipparcos Data for the Massive O-type Eclipsing Binary UW CMa

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    Hipparcos photometric data for the massive O-type binary UW CMa were analysed within the framework of the Roche model. Photometric solutions were obtained for five mass ratios in the q=M2/M1=0.5−1.5q=M_2/M_1=0.5-1.5 range. The system is found to be in a contact configuration. Independently of qq, the best-fitting model solutions correspond to the orbital inclination i∼71∘i \sim 71^\circ and the temperature of the secondary component T2∼33500 KT_2 \sim 33500\,K, at the fixed temperature of the primary T1=33750KT_1=33750 K. Considering that the spectrum of the secondary is very weak, photometric solutions corresponding to the contact configuration favor the mass ratio qq smaller than unity (in which case the luminosity of the secondary is smaller than that of the primary). The absolute parameters of the system are estimated for different values of the mass ratio.Comment: 18 pages, 6 figure
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