Search Results - "Villanova, Sandro"

Very Metal-poor Stars in the Solar Vicinity: Kinematics and Abundance Analysis by Plotnikova, Anastasiia, Carraro, Giovanni, Villanova, Sandro, Ortolani, Sergio

“…Abstract Very metal-poor stars contain crucial information on the Milky Way’s infancy. In our previous study we derived a mean age of ∼13.7 Gyr for a sample of…”
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IDENTIFICATION OF NEODYMIUM IN THE APOGEE H-BAND SPECTRA by Hasselquist, Sten, Shetrone, Matthew, Cunha, Katia, Smith, Verne V., Holtzman, Jon, Lawler, J. E., Prieto, Carlos Allende, Beers, Timothy C., Chojnowski, Drew, Fernández-Trincado, J. G., García-Hernández, D. A., Hearty, Fred R., Majewski, Steven R., Pereira, C. B., Placco, Vinicius M., Villanova, Sandro, Zamora, Olga

“…ABSTRACT We present the detection of 10 lines of singly ionized neodymium (Nd ii, Z = 60) in H-band spectra using observations from the SDSS-III Apache Point…”
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The Passa Três Granite Intrusion-Related/Hosted Neoproterozoic Gold Deposit (Paraná State, Brazil): Mineralogical, Geochemical, Fluid Inclusion and Sulphur Isotope Constraints by Bárbara Carolina Dressel, Alain Chauvet, Kalin Kouzmanov, Barbara Trzaskos, Olivier Bruguier, Patrick Monié, Sandro Notto Villanova, José Bazille Newton

“…The Passa Três granite is a 5 km2 intrusion in southern Brazil with an NNE–SSW-elongated shape, hosting gold-bearing quartz veins with fluorite, carbonates,…”
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NGC 6791: A Probable Bulge Cluster without Multiple Populations by Villanova, Sandro, Carraro, Giovanni, Geisler, Doug, Monaco, Lorenzo, Assmann, Paulina

“…Abstract NGC 6791 is a unique stellar cluster, key to our understanding of both the multiple stellar population phenomenon and the evolution and assembly of…”
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Very Metal-poor Stars in the Solar Vicinity: Age Determination by Plotnikova, Anastasiia, Carraro, Giovanni, Villanova, Sandro, Ortolani, Sergio

“…Abstract The ages of the oldest and most metal-poor stars in the Milky Way bear important information on the age of the universe and its standard model. We…”
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Detailed Chemical Composition and Orbit of the Newly Discovered Globular Cluster FSR 1758: Implications for the Accretion of the Sequoia Dwarf Galaxy onto the Milky Way Based on observations carried out at the Magellan/Clay telescope under program CN2018B-71 by Villanova, Sandro, Monaco, Lorenzo, Geisler, Doug, O'Connell, Julia, Minniti, Dante, Assmann, Paulina, Barbá, Rodolfo

“…We present detailed chemical abundances, radial velocity, and orbital parameters for FSR 1758, a recently discovered massive cluster in the direction of the…”
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Ages and Heavy Element Abundances from Very Metal-poor Stars in the Sagittarius Dwarf Galaxy by Hansen, Camilla Juul, El-Souri, Mariam, Monaco, Lorenzo, Villanova, Sandro, Bonifacio, Piercarlo, Caffau, Elisabetta, Sbordone, Luca

“…Abstract Sagittarius (Sgr) is a massive disrupted dwarf spheroidal galaxy in the Milky Way halo that has undergone several stripping events. Previous chemical…”
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A Distance Determination to the Small Magellanic Cloud with an Accuracy of Better than Two Percent Based on Late-type Eclipsing Binary Stars by Graczyk, Dariusz, Pietrzy ski, Grzegorz, Thompson, Ian B., Gieren, Wolfgang, Zgirski, Bart omiej, Villanova, Sandro, Górski, Marek, Wielgórski, Piotr, Karczmarek, Paulina, Narloch, Weronika, Pilecki, Bogumi, Taormina, Monica, Smolec, Rados aw, Suchomska, Ksenia, Gallenne, Alexandre, Nardetto, Nicolas, Storm, Jesper, Kudritzki, Rolf-Peter, Ka uszy ski, Miko aj, Pych, Wojciech

“…We present a new study of late-type eclipsing binary stars in the Small Magellanic Cloud (SMC) undertaken with the aim of improving the distance determination…”
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APOGEE Chemical Abundance Patterns of the Massive Milky Way Satellites by Hasselquist, Sten, Hayes, Christian R., Lian, Jianhui, Weinberg, David H., Zasowski, Gail, Horta, Danny, Beaton, Rachael, Feuillet, Diane K., Garro, Elisa R., Gallart, Carme, Smith, Verne V., Holtzman, Jon A., Minniti, Dante, Lacerna, Ivan, Shetrone, Matthew, Jönsson, Henrik, Cioni, Maria-Rosa L., Fillingham, Sean P., Cunha, Katia, O’Connell, Robert, Fernández-Trincado, José G., Muñoz, Ricardo R., Schiavon, Ricardo, Almeida, Andres, Anguiano, Borja, Beers, Timothy C., Bizyaev, Dmitry, Brownstein, Joel R., Cohen, Roger E., Frinchaboy, Peter, García-Hernández, D. A., Geisler, Doug, Lane, Richard R., Majewski, Steven R., Nidever, David L., Nitschelm, Christian, Povick, Joshua, Price-Whelan, Adrian, Roman-Lopes, Alexandre, Rosado, Margarita, Sobeck, Jennifer, Stringfellow, Guy, Valenzuela, Octavio, Villanova, Sandro, Vincenzo, Fiorenzo

“…Abstract The SDSS-IV Apache Point Observatory Galactic Evolution Experiment (APOGEE) survey has obtained high-resolution spectra for thousands of red giant…”
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Detailed Chemical Composition and Orbit of the Newly Discovered Globular Cluster FSR 1758: Implications for the Accretion of the Sequoia Dwarf Galaxy onto the Milky Way by Villanova, Sandro, Monaco, Lorenzo, Geisler, Doug, O’Connell, Julia, Minniti, Dante, Assmann, Paulina, Barbá, Rodolfo

“…Abstract We present detailed chemical abundances, radial velocity, and orbital parameters for FSR 1758, a recently discovered massive cluster in the direction…”
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THE ARAUCARIA PROJECT. THE DISTANCE TO THE SMALL MAGELLANIC CLOUD FROM LATE-TYPE ECLIPSING BINARIES by Graczyk, Dariusz, Pietrzynski, Grzegorz, Thompson, Ian B, GIEREN, WOLFGANG, PILECKI, BOGUMILL, KONORSKI, PIOTR, Udalski, Andrzej, Soszynski, Igor, Villanova, Sandro, Gorski, Marek, SUCHOMSKA, KSENIA, KARCZMAREK, PAULINA, KUDRITZKI, ROLF-PETER, Bresolin, Fabio, GALLENNE, ALEXANDRE

“…We present a distance determination to the Small Magellanic Cloud (SMC) based on an analysis of four detached, long-period, late-type eclipsing binaries…”
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NGC 6791: A Probable Bulge Cluster without Multiple Populations Based on observations carried out at La Silla Paranal Observatory under program 095.D-0294 by Villanova, Sandro, Carraro, Giovanni, Geisler, Doug, Monaco, Lorenzo, Assmann, Paulina

“…NGC 6791 is a unique stellar cluster, key to our understanding of both the multiple stellar population phenomenon and the evolution and assembly of the Galaxy…”
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APOGEE Chemical Abundances of the Sagittarius Dwarf Galaxy by Hasselquist, Sten, Shetrone, Matthew, Smith, Verne, Holtzman, Jon, McWilliam, Andrew, Fernández-Trincado, J. G., Beers, Timothy C., Majewski, Steven R., Nidever, David L., Tang, Baitian, Tissera, Patricia B., Alvar, Emma Fernández, Allende Prieto, Carlos, Almeida, Andres, Anguiano, Borja, Battaglia, Giuseppina, Carigi, Leticia, Delgado Inglada, Gloria, Frinchaboy, Peter, García-Hernández, D. A., Geisler, Doug, Minniti, Dante, Placco, Vinicius M., Schultheis, Mathias, Sobeck, Jennifer, Villanova, Sandro

“…The Apache Point Observatory Galactic Evolution Experiment provides the opportunity of measuring elemental abundances for C, N, O, Na, Mg, Al, Si, P, K, Ca, V,…”
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A comparative analysis of the chemical compositions of Gaia-Enceladus/Sausage and Milky Way satellites using APOGEE by Fernandes, Laura, Mason, Andrew C, Horta, Danny, Schiavon, Ricardo P, Hayes, Christian, Hasselquist, Sten, Feuillet, Diane, Beaton, Rachael L, Jönsson, Henrik, Kisku, Shobhit, Lacerna, Ivan, Lian, Jianhui, Minniti, Dante, Villanova, Sandro

“…ABSTRACT We use data from the 17th data release of the Apache Point Observatory Galactic Evolution Experiment (APOGEE 2) to contrast the chemical composition…”
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High-resolution Extinction Map in the Direction of the Strongly Obscured Bulge Fossil Fragment Liller 1 by Pallanca, Cristina, Ferraro, Francesco R., Lanzoni, Barbara, Crociati, Chiara, Saracino, Sara, Dalessandro, Emanuele, Origlia, Livia, Rich, Michael R., Valenti, Elena, Geisler, Douglas, Mauro, Francesco, Villanova, Sandro, Moni Bidin, Christian, Beccari, Giacomo

“…Abstract We used optical images acquired with the Wide Field Camera of the Advanced Camera for Surveys on board the Hubble Space Telescope and near-infrared…”
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Chemical Abundances of Main-sequence, Turnoff, Subgiant, and Red Giant Stars from APOGEE Spectra. I. Signatures of Diffusion in the Open Cluster M67 by Souto, Diogo, Cunha, Katia, Smith, Verne V., Prieto, C. Allende, García-Hernández, D. A., Pinsonneault, Marc, Holzer, Parker, Frinchaboy, Peter, Holtzman, Jon, Johnson, J. A., Jönsson, Henrik, Majewski, Steven R., Shetrone, Matthew, Sobeck, Jennifer, Stringfellow, Guy, Teske, Johanna, Zamora, Olga, Zasowski, Gail, Carrera, Ricardo, Stassun, Keivan, Fernandez-Trincado, J. G., Villanova, Sandro, Minniti, Dante, Santana, Felipe

“…Detailed chemical abundance distributions for 14 elements are derived for eight high-probability stellar members of the solar metallicity old open cluster M67…”
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APOGEE chemical abundances of globular cluster giants in the inner Galaxy by Schiavon, Ricardo P., Johnson, Jennifer A., Frinchaboy, Peter M., Zasowski, Gail, Mészáros, Szabolcs, García-Hernández, D. A., Cohen, Roger E., Tang, Baitian, Villanova, Sandro, Geisler, Douglas, Beers, Timothy C., Fernández-Trincado, J. G., García Pérez, Ana E., Lucatello, Sara, Majewski, Steven R., Martell, Sarah L., O'Connell, Robert W., Prieto, Carlos Allende, Bizyaev, Dmitry, Carrera, Ricardo, Lane, Richard R., Malanushenko, Elena, Malanushenko, Viktor, Muñoz, Ricardo R., Nitschelm, Christian, Oravetz, Daniel, Pan, Kaike, Roman-Lopes, Alexandre, Schultheis, Matthias, Simmons, Audrey

“…We report chemical abundances obtained by Sloan Digital Sky Survey (SDSS)-III/Apache Point Observatory Galactic Evolution Experiment for giant stars in five…”
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Disentangling the Galactic Halo with APOGEE. II. Chemical and Star Formation Histories for the Two Distinct Populations by Fernández-Alvar, Emma, Carigi, Leticia, Schuster, William J., Hayes, Christian R., Ávila-Vergara, Nancy, Majewski, Steve R., Allende Prieto, Carlos, Beers, Timothy C., Sánchez, Sebastián F., Zamora, Olga, García-Hernández, Domingo Aníbal, Tang, Baitian, Fernández-Trincado, José G., Tissera, Patricia, Geisler, Douglas, Villanova, Sandro

“…The formation processes that led to the current Galactic stellar halo are still under debate. Previous studies have provided evidence for different stellar…”
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Atmospheric parameters and chemical abundances within 100 pc: a sample of G, K, and M main-sequence stars by López-Valdivia, Ricardo, Adame, Lucía, Zagala Lagunas, Eduardo, Román-Zúñiga, Carlos G, Hernández, Jesús, Sánchez, Edilberto, Fernández-Trincado, José G, Carigi, Leticia, Kounkel, Marina, Lane, Richard R, Stassun, Keivan G, Villanova, Sandro

“…ABSTRACT To date, we have access to enormous inventories of stellar spectra that allow the extraction of atmospheric parameters and chemical abundances…”
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A comparative analysis of the chemical compositions of Gaia-Enceladus/Sausage and Milky Way satellites using APOGEE by Fernandes, Laura, Mason, Andrew C., Horta, Danny, Schiavon, Ricardo P., Hayes, Christian, Hasselquist, Sten, Feuillet, Diane, Beaton, Rachael L., Jönsson, Henrik, Kisku, Shobhit, Lacerna, Ivan, Lian, Jianhui, Minniti, Dante, Villanova, Sandro

“…ABSTRACT We use data from the 17th data release of the Apache Point Observatory Galactic Evolution Experiment (APOGEE 2) to contrast the chemical composition…”
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