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We present a detailed spectroscopic analysis of horizontal branch stars in the globular cluster NGC 3201. We collected optical (4580-5330), high-resolution (∼34,000), high signal-to-noise ratio (∼200) spectra for 11 RR Lyrae stars and one red horizontal branch star with the multifiber spectrograp...


Magurno, D.Sneden, C.Braga, V.F.Bono, G.Mateo, M.Persson, S.E.Dall'Ora, M.Marengo, M.Monelli, M.Neeley, J.R.[Chemical Compositions of Field and Globular Cluster RR Lyrae Stars. I. NGC 3201]Chemical Compositions of Field and Globular Cluster RR Lyrae Stars. I. NGC 3201

We present new theoretical period-luminosity-metallicity (PLZ) relations for RR Lyræ stars (RRLs) at Spitzer and WISE wavelengths. The PLZ relations were derived using nonlinear, time-dependent convective hydrodynamical models for a broad range of metal abundances (Z = 0.0001-0.0198). In deriving...


Neeley, J.R.Marengo, M.Bono, G.Braga, V.F.Dall'ora, M.Magurno, D.Marconi, M.Trueba, N.Tognelli, E.Moroni, P.G.P.Beaton, R.L.Freedman, W.L.Madore, B.F.Monson, A.J.Scowcroft, V.Seibert, M.Stetson, P.B.[On a New Theoretical Framework for RR Lyrae Stars. II. Mid-infrared Period-Luminosity-Metallicity Relations]On a New Theoretical Framework for RR Lyrae Stars. II. Mid-infrared Period-Luminosity-Metallicity Relations

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