Photometry and isochrone fitting of NGC 6712
Schonfeld, Samuel Joseph
May 19, 2012
This work presents new BV photometric observations of the Galactic globular cluster NGC 6712. The observations include an 18′ square centered on the cluster with a limiting V magnitude of 21. Heavy field star contamination makes NGC 6712 a difficult cluster to study, but simply restricting image analysis to a narrow field of view centered on the cluster provides enough definition of the cluster color magnitude diagram (CMD) to identify the red giant and sub-giant branches. This CMD is fit with the Dartmouth Stellar Evolution Program (DSEP) models which determine that NGC 6712 has an age of 12±1 Gyr, distance modulus of (m-M)v̳=15.85±0.20, metallicity of [Fe/H]= -1.10±0.05, and a reddening of E(B-V)=0.41±0.05. These values agree well with previous studies and provide a confirmation of the accuracy of the DSEP models.
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