Rediscussion of eclipsing binaries. XVII - Spectroscopic orbits of OB systems with a cross-correlation procedure

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Abstract

An effort is made to apply the reduction techniques, including cross correlation, developed at Victoria by Hill et al. (1982) to photographic spectrograms of OB binaries in order to correct for the effects of overlapping profiles. According to the calibration using synthetic binaries, the values of K derived by the cross correlation method are larger than the true values by an average of 2.0 percent for the primary components and 3.0 percent for the secondaries. The average luminosity ratio is 0.7. The values of K obtained for the eclipsing binaries by the procedure are, as expected, greater than the values obtained by oscilloscopic scanning of the same spectrograms. Although the values of K and hence the masses and radii are probably more reliable than earlier results, it is concluded that the elimination of systematic effects in the velocities of double-line OB binaries is a difficult task that may not have been accomplished completely.

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