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The Cluster NGC 330 in the SMC: Radial Velocities of Individual Stars

Published online by Cambridge University Press:  14 August 2015

M. W. Feast  and
C. Black
M. W. Feast
Affiliation:
South African Astronomical Observatory, Cape
C. Black
Affiliation:
South African Astronomical Observatory, Cape

Extract

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Radial velocities based on 81 image tube spectra at 30 Å mm−1 are given for 25 stars (17 early type supergiants or upper main sequence stars and 8 late type stars) in the young SMC cluster NGC 330. An upper (one standard deviation) limit to the velocity dispersion is found to be 2 km s−1. The mass-to-light ratio is likely to be less than 0.1 in solar units. Results for other young Magellanic Cloud clusters derived on the assumption that they are tidally limited are consistent with this result. Spectroscopic binaries with semi-amplitudes, K, greater than about 10 km s−1 appear to be rare or absent amongst the stars studied.

Type
August 29 Open And Globular Clusters
Information
Symposium - International Astronomical Union , Volume 85: Star Clusters , 1980 , pp. 339
Copyright
Copyright © Reidel 1980