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A Survey of Globular Cluster Velocity Dispersions

  • Carlton Pryor (a1), Robert D. McClure (a2), J. M. Fletcher (a2) and James E. Hesser (a2)

Extract

We have used the Dominion Astrophysical Observatory radial velocity spectrometer on the 3.6m Canada-France-Hawaii telescope to obtain radial velocities, accurate to ~0.8 km/s, for ~20 stars in each of nine globular clusters. The stars are generally within three core radii of the cluster center. The cluster names and metallicities (the latter are averages of values in Zinn and West (1984), Pilachowski (1984), and Webbink (1985)) are given in Table I. This sample includes two clusters with cusps in their surface brightness profiles: NGC 6624 and 6681.

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References

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Djorgovski, S. and King, I. R. 1984 Astrophys. J. Letters 277, L49.
Gunn, J. E. and Griffin, R. F. 1979 Astron. J. 84, 752.
McClure, R. D., VandenBerg, D. A., Smith, G. H., Fahlman, G. G., Richer, H. B., Hesser, J. E., Harris, W. E., Stetson, P. B. and Bell, R. A. 1986 Astrophys. J. Letters 307, L47.
Pilachowski, C. A. 1984 Astrophys. J. 281, 614.
Pryor, C., McClure, R. D. and Smith, G. H. 1986 Astron. J. 92, in press.
Webbink, R. F. 1985 in IAU Symposium No. 113. Dynamics of Star Clusters, Goodman, J. and Hut, P., eds., Reidel, Dordrecht, p. 541.
Zinn, R. and West, M. J. 1984 Astrophys. J. Suppl. 55, 45.

A Survey of Globular Cluster Velocity Dispersions

  • Carlton Pryor (a1), Robert D. McClure (a2), J. M. Fletcher (a2) and James E. Hesser (a2)

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