The Frequency of Binary Stars in the Young Cluster Trumpler 14

• Published in: Publications of the Astronomical Society of the Pacific Vol. 105; no. 688; pp. 588 - 594
• Main Authors: Penny, Laura R., Gies, Douglas R., Hartkopf, William I., Mason, Brian D., Turner, Nils H.
• Format: Journal Article
• Language: English
• Published: Chicago, IL American Institute of Physics 01-06-1993; University of Chicago Press
• Subjects: Astronomical research; Astronomy; Earth, ocean, space; Exact sciences and technology; Globular clusters in the milky way; O stars; Observational research; Orbital velocity; Radial velocity; Rotation; Stars; Stellar clusters and associations; Stellar spectra; Stellar spectral lines; Stellar systems. Galactic and extragalactic objects and systems. The universe; Wavelengths; Massive star; O star; Open cluster; B star; Binary star; Radial velocity; Speckle interferometry; Spectroscopical observation; Optical spectrum
• ISSN: 0004-6280; 1538-3873
• DOI: 10.1086/133200

We present radial-velocity data for the six brightest members of the open cluster Trumpler 14 based on high-dispersion spectra obtained over a five-night interval. None of these O-type stars appear to be spectroscopie binaries with periods of the order of a week or less, and none are speckle binaries. This binary fraction is low for O-type stars, and we suggest that the lack of primordial hard binaries and their dynamical interactions may explain how the cluster has maintained a high spatial density even after several cluster crossing times.