Reinvestigation of the binary frequency in the open cluster IC 4665

Details Reinvestigation of the binary frequency in the open cluster IC 4665 Reinvestigation of the binary frequency in the open cluster IC 4665

Sep 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...378..157m&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 378, Sept. 1, 1991, p. 157-162.

Astronomy and Astrophysics

Astrophysics

13

Binary Stars, Open Clusters, Radial Velocity, Stellar Rotation, Charge Coupled Devices, Orbital Elements, Velocity Measurement

Scientific paper

The radial velocities of 15 bright B3-A2 stars in the cluster IC 4665 are measured using a CCD. Only four of the 15 stars are spectroscopic binaries, giving a binary frequency of 27 percent. Four of the six sharp-lined stars are binaries, and none of the more rapidly rotating stars are binaries with K at least 10 km/s. Statistically, nearly all of the stars with low projected rotational velocities are slow rotators, and most are binaries; two of the four binaries may rotate synchronously. In two of the four binaries, the mass ratios are near 1.0, as would be expected for binary formation in three-body interactions after many crossing times. The measured cluster velcoity dispersion is only 1.6 km/s, but most of that is still probably due to measuring errors.

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