Abstract
Globular clusters contain the largest coeval populations of stars in the Milky Way, making them prime targets for stellar evolution studies. We present new theoretical isochrones for the brightest monometallic globular cluster 47 Tucanae, based on the spectroscopic measurements of the chemical composition in literature. Calculated colors are compared to existing photometric observations with Advanced Camera for Surveys on the Hubble Space Telescope. We find that the adopted abundances are consistent with the blue tail of the observed color distribution, implying a possible systematic offset between spectroscopic and photometric abundances of globular clusters. Additionally, we make color–magnitude predictions for future observations with the Near Infrared Camera on the James Webb Space Telescope in bands corresponding to the ongoing observational campaigns.
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