Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998pasp..110..900m&link_type=abstract
The Publications of the Astronomical Society of the Pacific, Volume 110, Issue 750, pp. 900-905.
Astronomy and Astrophysics
Astronomy
15
Stars: Binaries: Spectroscopic, Stars: Binaries: Visual, Galaxy: Open Clusters And Associations: Individual: Name: Collinder 419, Stars: Individual: Henry Draper Number: Hd 193322Ab
Scientific paper
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.
Bagnuolo William G. Jr.
Bolton Charles T.
Fullerton Alex W.
Gies Douglas R.
Hahula Michael E.
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