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- W202227628 abstract "A rough estimate of the age of a globular cluster can be made by finding the magnitude of the bluest stars still on the main sequence. Globular clusters, such as 47 Tucanae, which are the most ancient objects clearly identified in studies of stellar evolution and are tens of thousands of light years distant, have been studied in the last few years with silicon-intensified vidicons and CCDs with increasing accuracy. Large telescope, long-exposure photographs of 47 Tucanae reveal crowded swarms of stars rich in elements other than H and He. Photometric studies at Cerro Tololo on a 47 Tucanae sample of 660 stars with visual or yellow (V) magnitudes between 17 and 22 have resulted in a best-ever plot of intrinsic color against absolute magnitude. Several refinements include a better definition of conditions at a star's surface, such as temperature and pressure, through the use of stellar atmosphere models which neglect effects of rotation, slight star-to-star age differences, and mass. An improvement is foreseen in intrinsic color against absolute magnitude plots because of CCD data obtained with large telescopes in both the Northern and Southern Hemispheres." @default.
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- W202227628 date "1984-09-01" @default.
- W202227628 modified "2023-09-26" @default.
- W202227628 title "Probing 47 Tucanae" @default.
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