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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 constructed new sets of He-enhanced (Y = 0.30, Y = 0.40) nonlinear, time-dependent convective hydrodynamical models of RR Lyrae (RRL) stars covering a broad range in metal abundances (Z = 0.0001-0.02). The increase in He content from the canonical value (Y = 0.245) to Y = 0.30-0.40 causes a si...


Marconi, M.Bono, G.Pietrinferni, A.Braga, V.F.Castellani, M.Stellingwerf, R.F.[On the Impact of Helium Content on the RR Lyrae Distance Scale]On the Impact of Helium Content on the RR Lyrae Distance Scale

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

Context. Type II Cepheids (T2Cs) are radially pulsating variables that trace old stellar populations and provide distance estimates through their period-luminosity (PL) relation. Aims. We trace the structure of old stellar population in the Galactic bulge using new distance estimates and kinemati...


Braga, V.F.Bhardwaj, A.Contreras Ramos, R.Minniti, D.Bono, G.De Grijs, R.Minniti, J.H.Rejkuba, M.[Structure and kinematics of Type II Cepheids in the Galactic bulge based on near-infrared VVV data]Structure and kinematics of Type II Cepheids in the Galactic bulge based on near-infrared VVV data

D'Orazi, V.Magurno, D.Bono, G.Matsunaga, N.Braga, V.F.Elgueta, S.S.Fukue, K.Hamano, S.Inno, L.Kobayashi, N.Kondo, S.Monelli, M.Nonino, M.Przybilla, N.Sameshima, H.Saviane, I.Taniguchi, D.Thevenin, F.Urbaneja-Perez, M.Watase, A.Arai, A.Bergemann, M.Buonanno, R.Dall'Ora, M.Da Silva, R.Fabrizio, M.Ferraro, I.Fiorentino, G.Francois, P.Gilmozzi, R.Iannicola, G.Ikeda, Y.Jian, M.Kawakita, H.Kudritzki, R.P.Lemasle, B.Marengo, M.Marinoni, S.Martínez-Vázquez, C.E.Minniti, D.Neeley, J.Otsubo, S.Prieto, J.L.Proxauf, B.Romaniello, M.Sanna, N.Sneden, C.Takenaka, K.Tsujimoto, T.Valenti, E.Yasui, C.Yoshikawa, T.Zoccali, M.[On the Chemical Abundances of Miras in Clusters: V1 in the Metal-rich Globular NGC 5927]On the Chemical Abundances of Miras in Clusters: V1 in the Metal-rich Globular NGC 5927

Braga, V.F.Stetson, P.B.Bono, G.Dall'Ora, M.Ferraro, I.Fiorentino, G.Iannicola, G.Marconi, M.Marengo, M.Monson, A.J.Neeley, J.Persson, S.E.Beaton, R.L.Buonanno, R.Calamida, A.Castellani, M.Carlo, E.D.Fabrizio, M.Freedman, W.L.Inno, L.Madore, B.F.Magurno, D.Marchetti, E.Marinoni, S.Marrese, P.Matsunaga, N.Minniti, D.Monelli, M.Nonino, M.Piersimoni, A.M.Pietrinferni, A.Prada-Moroni, P.Pulone, L.Stellingwerf, R.Tognelli, E.Walker, A.R.Valenti, E.Zoccali, M.[On the RR Lyrae Stars in Globulars. V. the Complete Near-infrared (JHK s) Census of ω Centauri RR Lyrae Variables]On the RR Lyrae Stars in Globulars. V. the Complete Near-infrared (JHK s) Census of ω Centauri RR Lyrae Variables

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