A re-analysis of the eclipsing binary system VV Orionis

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Astronomical Photometry, Early Stars, Eclipsing Binary Stars, Ubv Spectra, B Stars, Computer Programs, Limb Darkening, Orbital Elements, Stellar Luminosity, Tables (Data)

Scientific paper

The observations of VV Ori in UBV and in uvby obtained by Chambliss in 1975-1979 are reanalyzed using an updated version of the WINK program of Wood (1971, 1972). Several solutions are obtained using the normal points. These establish fairly reliable values for the linear limb-darkening coefficient of VV Ori A and approximate values for the luminosity of this system's third component. Attempts to determine nonlinear coefficients of limb darkening for the primary component, however, are unavailing. Solutions are also obtained using all observations. Extremely close agreement is obtained between the values of the geometric elements determined from these solutions and those determined using the normal points only. The solutions based on all observations produce reliable values for the limb-darkening coefficient of VV Ori A, typically 0.30 + or - 0.04. It is noted that these results are in good agreement with theoretical limb darkening coefficients derived from model atmosphere calculations.

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