A 235 Star Sample Sodium, Magnesium, and Aluminum Abundance Study in the Globular Clusters M3 (NGC 5272) and M13 (NGC 6205)

We have derived sodium, magnesium, and aluminum abundances for more than 100 red giant branch (RGB) stars in each of the Galactic globular clusters M3 and M13 (235 total stars), using moderate resolution ( \documentclass{aastex} \usepackage{amsbsy} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{bm} \usepackage{mathrsfs} \usepackage{pifont} \usepackage{stmaryrd} \usepackage{textcomp} \usepackage{portland,xspace} \usepackage{amsmath,amsxtra} \usepackage[OT2,OT1]{fontenc} \newcommand\cyr{ \renewcommand\rmdefault{wncyr} \renewcommand\sfdefault{wncyss} \renewcommand\encodingdefault{OT2} \normalfont \selectfont} \DeclareTextFontCommand{\textcyr}{\cyr} \pagestyle{empty} \DeclareMathSizes{10}{9}{7}{6} \begin{document} \landscape $R\sim 10,000$ \end{document} ) spectra obtained with the 3.5 m WIYN telescope and Hydra multifiber spectrograph. Temperatures for the cluster samples are based on calibrations of photometric indices, in particular \documentclass{aastex} \usepackage{amsbsy} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{bm} \usepackage{mathrsfs} \usepackage{pifont} \usepackage{stmaryrd} \usepackage{textcomp} \usepackage{portland,xspace} \usepackage{amsmath,amsxtra} \usepackage[OT2,OT1]{fontenc} \newcommand\cyr{ \renewcommand\rmdefault{wncyr} \renewcommand\sfdefault{wncyss} \renewcommand\encodingdefault{OT2} \normalfont \selectfont} \DeclareTextFontCommand{\textcyr}{\cyr} \pagestyle{empty} \DeclareMathSizes{10}{9}{7}{6} \begin{document} \landscape $V-K$ \end{document} . Gravities, microturbulent velocities, and the overall M3 and M13 metallicities ( \documentclass{aastex} \usepackage{amsbsy} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{bm} \usepackage{mathrsfs} \usepackage{pifont} \usepackage{stmaryrd} \usepackage{textcomp} \usepackage{portland,xspace} \usepackage{amsmath,amsxtra} \usepackage[OT2,OT1]{fontenc} \newcommand\cyr{ \renewcommand\rmdefault{wncyr} \renewcommand\sfdefault{wncyss} \renewcommand\encodingdefault{OT2} \normalfont \selectfont} \DeclareTextFontCommand{\textcyr}{\cyr} \pagestyle{empty} \DeclareMathSizes{10}{9}{7}{6} \begin{document} \landscape $[ \mathrm{Fe}\,/ \mathrm{H}\,] \sim -1.50$ \end{document} ) are based on the results of previous work by the Lick‐Texas group. Na and Mg abundances have been determined from observed versus synthetic spectrum matches of the Naiλλ5682, 5688 lines and the Mgiλ5711 line. Al abundances have been determined from equivalent‐width measurements of the Ali(λλ6696, 6698) doublet. Th