Gclusters :: Bibliographic item "gc417"

Release 11.12 ("Hergest Ridge")

Gclusters :: Bibliographic item "gc417"

Article ID: gc417

Author Shapley, H.

Title Studies based on the colors and magnitudes in stellar clusters. XV. A photometric analysis of the globular cluster system Messier 68
Journal Astrophysical Journal, 51, 49-61
Year of publication 1920 (on gclusters from 2013-11-28 11:15:36 )

Abstract The paper contains the results of a characteristic photometric analysis of this hitherto unexplored typical cluster, based on fifteen photographs made at the primary focus of the 60-inch reflector. Twenty-eight variable stars were discovered, all but one of which appear to be typical, short-period, cluster variables. The cluster is poorer in giant stars than some others, as only 250 are brighter than the absolute magnitude zero. The magnitudes and colors of 56 of the brightest of these are tabulated. Most of them are red or yellow. The distance of the cluster as computed by three methods which give concordant results is about 55,000 light-years. The form is quite accurately circular as far as the two thousands brightest stars are concerned.

Tags NGC 4590
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Article ID: gc417
Author	Shapley, H.
Title	Studies based on the colors and magnitudes in stellar clusters. XV. A photometric analysis of the globular cluster system Messier 68
Journal	Astrophysical Journal, 51, 49-61
Year of publication	1920 (on gclusters from 2013-11-28 11:15:36 )
Abstract	The paper contains the results of a characteristic photometric analysis of this hitherto unexplored typical cluster, based on fifteen photographs made at the primary focus of the 60-inch reflector. Twenty-eight variable stars were discovered, all but one of which appear to be typical, short-period, cluster variables. The cluster is poorer in giant stars than some others, as only 250 are brighter than the absolute magnitude zero. The magnitudes and colors of 56 of the brightest of these are tabulated. Most of them are red or yellow. The distance of the cluster as computed by three methods which give concordant results is about 55,000 light-years. The form is quite accurately circular as far as the two thousands brightest stars are concerned.
Tags	NGC 4590