Date of Thesis Acceptance
Major Department or Program
This work presents new BV photometric observations of the Ga lactic globular cluster NGC 6712. The observations include an 18 ′ square centered on the cluster with a limiting V magnitude of 21. Heavy field star c ontamination makes NGC 6712 a difficult cluster to study, but simply restrict ing image analysis to a narrow field of view centered on the cluster prov ides enough definition of the cluster color magnitude diagram (CMD) to id entify the red giant and sub-giant branches. This CMD is fit with the Dartmou th Stellar Evolution Program (DSEP) models which determine that NGC 671 2 has an age of 12 ± 1 Gyr, distance modulus of (m − M) V =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 o f the accuracy of the DSEP models.
Astronomical photometry -- Observation, Galactic clusters, Stars -- New General Catalogue of Nebulae and Clusters of Stars -- NGC 6712, Horizontal branch stars -- Red giant branch, HR diagrams, Hertzsprung-Russell diagram, Subgiant stars, Stars -- Clusters, Red giants, Color-magnitude diagram, Stellar evolution, Whitman College -- Dissertation collection 2012 -- Astronomy Department
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