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Spectroscopic and Photometric Observations of the Southern, Intermediate-Age Clusters NGC 2477 and NGC 2660

Published online by Cambridge University Press:  14 August 2015

James E. Hesser  and
Horace A. Smith
James E. Hesser
Affiliation:
Dominion Astrophysical Observatory
Horace A. Smith
Affiliation:
Yale University Observatory

Extract

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47 A mm−1 image-tube spectra show that the turnoff region and blue straggler stars in NGC 2477 are not, in general, rapid rotators, as postulated by Hartwick and Hesser (1974) to explain, via mixing induced by meridional circulation, the widely differing photometric metallicity estimates based upon uvbyβ photometry of the main-sequence stars and DDO photometry of the giant stars. However, the discrepant metallicity estimates are largely reconciled by recent revisions in the reddening corrections for the DDO system (Boyle 1979, Janes 1979); and by small color corrections of the type described by Muzzio (1978) and Schmidt and Taylor (1979) applied to the β-photometry. The mean radial velocity is found to be 5.6 kms−1 while the mean Vsini is 105 km s−1. Star “m” is spectroscopically confirmed to be an Am star.

Type
August 28 Open Clusters
Information
Symposium - International Astronomical Union , Volume 85: Star Clusters , 1980 , pp. 235 - 236
Copyright
Copyright © Reidel 1980 

References

Boyle, R.: 1979, Ph.D. Dissertation, Yale University (in preparation).Google Scholar
Demarque, P., and McClure, R. D.: 1973, Mon. Not. Roy. Ast. Soc. 164, 5P.Google Scholar
Hartwick, F.D.A., and Hesser, J. E.: 1973, Astrophys. J. 183, 883.Google Scholar
Hartwick, F.D.A., and Hesser, J. E.: 1974, Ibid., 192, 391.Google Scholar
Janes, K.A.: 1979, Astrophys. J. Suppl. 39, 135.Google Scholar
Muzzio, J. C.: 1978, Astron. J. 83, 1643.Google Scholar
Schmidt, E. S., and Taylor, D. J.: 1979, Ibid. 84, 1193.Google Scholar