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Deep Mixing and Metallicity: Carbon Depletion in Globular Cluster Giants
Sarah L. Martell, Graeme H. Smith, Michael M. Briley
We present the results of an observational study of the efficiency of deep mixing in globular cluster red giants as a function of stellar metallicity. We determine [C/Fe] abundance…
An Improved Bandstrength Index for the CH G Band of Globular Cluster Giants
Sarah L. Martell, Graeme H. Smith, Michael M. Briley
Spectral indices are useful tools for quantifying the strengths of features in moderate-resolution spectra and relating them to intrinsic stellar parameters. This paper focuses on…
CN Bimodality at Low Metallicity: The Globular Cluster M53
Sarah L. Martell, Graeme H. Smith, Michael M. Briley
We present low resolution UV-blue spectroscopic observations of red giant stars in the globular cluster M53 ([Fe/H]=-1.84), obtained to study primordial abundance variations and de…
Stellar Activity and the Stromgren Photometric Metallicity Calibration of Intermediate-Type Dwarf Stars
Sarah L. Martell, Graeme H. Smith
We consider the effect of stellar activity, as measured by X-ray luminosity, on metallicities of Solar-neighborhood F and G dwarfs derived from Stromgren photometry. Rocha-Pinto &…
An Improved uvby-Metallicity Calibration for Metal-Rich Stars
Sarah Martell, Gregory Laughlin
We present an improved uvby-metallicity relation calibrated for F, G, and early K dwarfs, and an analogous uvby-T(eff) relation, both derived using a Levenberg-Marquardt minimizati…