A Long‐Period Spectroscopic Binary in the O‐Star Multiple System HD 193322

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Abstract

We present radial velocity measurements and a single‐lined spectroscopic orbit for the bright O‐type star, HD 193322A, which we show to be a 311 day binary system that has a distant third companion (detected by speckle interferometry) in a 31 yr orbit. We suggest that the speckle companion appears in the spectrum as a broad‐lined component of early B type. We also present a spectrum of the visual companion, HD 193322B, which appears to be an unresolved, double‐lined spectroscopic binary. Thus, HD 193322, the central object in the open cluster Collinder 419, is a multiple system that contains at least five stars (possibly seven if the C and D components are physical). Such systems may play a key role in the dynamical ejection of runaway stars from young clusters.

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