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THE OPEN CLUSTER NGC 6193: ANOTHER CLUSTER RICH IN SPECTROSCOPIC BINARIES
MARCELO ARNAL, NIDIA MORRELL, BEATRIZ GARCÍA and HUGO LEVATO
Publications of the Astronomical Society of the Pacific
Vol. 100, No. 631 (September 1988), pp. 1076-1083
Published by: Astronomical Society of the Pacific
Stable URL: http://www.jstor.org/stable/40679327
Page Count: 8
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From spectrographic observations of probable members of NGC 6193 we have obtained their radial velocities, projected axial rotational velocities, and approximate spectral types. We computed the average axial rotation with respect to the field stars for the members of NGC 6193 as 0.67 ± 0.08 and an average heliocentric radial velocity for the cluster of –33. km sec⁻¹. Six new spectroscopie binaries and a He-rich star were discovered. We compare the high incidence of spectroscopie binaries among the main-sequence members of NGC 6193 with clusters of similar average axial rotation.
Publications of the Astronomical Society of the Pacific © 1988 The University of Chicago Press