engleski

The eclipsing binary HD 92024: getting the orbit

HD 92024 (=V381 Car) is an SB1 eclipsing binary system with a $\beta$~Cephei star as primary component. We report on the progress of a combined photometric and spectroscopic investigation of this binary, being the only one of its kind known in the southern hemisphere. Pulsating components of spectroscopic binaries often introduce substantial line-profile variations in the spectra that hamper the determination of orbital radial-velocity amplitudes, and thus also of the stellar masses. Here, in order to minimise the bias from line-profile variations on the orbital RVs, we use selected matched-profile RV differences to derive the orbital parameters. The method is compared to straightforward cross-correlation with an averaged spectrum.

close binary stars; Beta Cephei pulsations; eclipsing binary

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