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New Main-Sequence Luminosity Functions for Globular Clusters

  • Robert D. McClure (a1), Peter B. Stetson (a1), James E. Hesser (a1), Graham H. Smith (a1), William E. Harris (a2) and Don A. VandenBerg (a3)...

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We report new results from a program which is aimed at obtaining deep CCD photometry for a sample of relatively nearby globular clusters having a wide range of metallicities. The CCD cameras on the CFHT 3.6 m, CTIO 4 m and KPNO 4 m telescopes have been used over the past 4 years to obtain deep exposures in regions of a number of clusters. In order to avoid the severest crowding, all of our observations have been obtained at distances of greater than ~ 5 core radii from the cluster centers. The images have been analysed by using the DAOPHOT point-spread-function fitting routines.

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Copyright

References

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McClure, R. D., VandenBerg, D. A., Smith, G. H., Fahlman, G. C. Richer, H. B., Hesser, J. E., Harris, W. E., Stetson, P. B. and Bell, R. A. 1986 Astrophys. J. Letters 307, L49.
Pilachowski, C. A. 1984 Astrophys. J. 281, 614.
VandenBerg, D. A. and Bell, R. A. 1985 Astrophys. J. Suppl. 58, 561.
Webbink, R. F. 1985 in IAU Symposium No. 113, Dynamics of Star Clusters, J. Goodman and Hut, P., eds., Reidel, Dorgrecht, p. 541.
Zinn, R. and West, M. J. 1984 Astrophys. J. Suppl. 55, 45.

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