Search Results - "Braga, Vittorio F."

Metallicity of Galactic RR Lyrae from Optical and Infrared Light Curves. I. Period–Fourier–Metallicity Relations for Fundamental-mode RR Lyrae by Mullen, Joseph P., Marengo, Massimo, Martínez-Vázquez, Clara E., Neeley, Jillian R., Bono, Giuseppe, Dall’Ora, Massimo, Chaboyer, Brian, Thévenin, Frédéric, Braga, Vittorio F., Crestani, Juliana, Fabrizio, Michele, Fiorentino, Giuliana, Gilligan, Christina K., Monelli, Matteo, Stetson, Peter B.

“…Abstract We present newly calibrated period– ϕ 31 –[Fe/H] relations for fundamental-mode RR Lyrae stars in the optical and, for the first time, mid-infrared…”
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Precise Empirical Determination of Metallicity Dependence of Near-infrared Period–Luminosity Relations for RR Lyrae Variables by Bhardwaj, Anupam, Marconi, Marcella, Rejkuba, Marina, de Grijs, Richard, Singh, Harinder P., Braga, Vittorio F., Kanbur, Shashi, Ngeow, Chow-Choong, Ripepi, Vincenzo, Bono, Giuseppe, De Somma, Giulia, Dall’Ora, Massimo

“…Abstract RR Lyrae variables are excellent Population II distance indicators thanks to their well-defined period–luminosity relations (PLRs) at infrared…”
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On a New Theoretical Framework for RR Lyrae Stars. II. Mid-infrared Period-Luminosity-Metallicity Relations by Neeley, Jillian R., Marengo, Massimo, Bono, Giuseppe, Braga, Vittorio F., Dall'Ora, Massimo, Magurno, Davide, Marconi, Marcella, Trueba, Nicolas, Tognelli, Emanuele, Moroni, Pier G. Prada, Beaton, Rachael L., Freedman, Wendy L., Madore, Barry F., Monson, Andrew J., Scowcroft, Victoria, Seibert, Mark, Stetson, Peter B.

“…We present new theoretical period-luminosity-metallicity (PLZ) relations for RR Lyræ stars (RRLs) at Spitzer and WISE wavelengths. The PLZ relations were…”
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Sparse Identification of Variable Star Dynamics by Pasquato, Mario, Abbas, Mohamad, Trani, Alessandro A., Nori, Matteo, Kwiecinski, James A., Trevisan, Piero, Braga, Vittorio F., Bono, Giuseppe, Macciò, Andrea V.

“…Abstract Variable stars play a crucial role as standard candles and provide valuable insights into stellar physics. They can be modeled either through fully…”
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RR Lyrae Mid-infrared Period–Luminosity–Metallicity and Period–Wesenheit–Metallicity Relations Based on Gaia DR3 Parallaxes by Mullen, Joseph P., Marengo, Massimo, Martínez-Vázquez, Clara E., Chaboyer, Brian, Bono, Giuseppe, Braga, Vittorio F., Dall’Ora, Massimo, D’Orazi, Valentina, Fabrizio, Michele, Monelli, Matteo, Thévenin, Frédéric

“…Abstract We present new empirical infrared period–luminosity–metallicity (PLZ) and period–Wesenheit–metallicity (PWZ) relations for RR Lyae based on the latest…”
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A DECam view of the diffuse dwarf galaxy Crater II – Variable stars by Vivas, A Katherina, Walker, Alistair R, Martínez-Vázquez, Clara E, Monelli, Matteo, Bono, Giuseppe, Dorta, Antonio, Nidever, David L, Fiorentino, Giuliana, Gallart, Carme, Andreuzzi, Gloria, Braga, Vittorio F, Dall’Ora, Massimo, Olsen, Knut, Stetson, Peter B

“…ABSTRACT Time series observations of a single dithered field centred on the diffuse dwarf satellite galaxy Crater II were obtained with the Dark Energy Camera…”
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Metallicities from high-resolution spectra of 49 RR Lyrae variables by Gilligan, Christina K, Chaboyer, Brian, Marengo, Massimo, Mullen, Joseph P, Bono, Giuseppe, Braga, Vittorio F, Crestani, Juliana, Dall’Ora, Massimo, Fiorentino, Giuliana, Monelli, Matteo, Neeley, Jill R, Fabrizio, Michele, Martínez-Vázquez, Clara E, Thévenin, Frédéric, Sneden, Christopher

“…ABSTRACT Accurate metallicities of RR Lyrae are extremely important in constraining period–luminosity–metallicity (PLZ) relationships, particularly in the…”
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Sparse Logistic Regression for RR Lyrae versus Binaries Classification by Trevisan, Piero, Pasquato, Mario, Carenini, Gaia, Mekhaël, Nicolas, Braga, Vittorio F., Bono, Giuseppe, Abbas, Mohamad

“…Abstract RR Lyrae (RRL) stars are old, low-mass, radially pulsating variable stars in their core helium burning phase. They are popular stellar tracers and…”
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Metallicity of Galactic RR Lyrae from Optical and Infrared Light Curves. II. Period–Fourier–Metallicity Relations for First Overtone RR Lyrae by Mullen, Joseph P., Marengo, Massimo, Martínez-Vázquez, Clara E., Bono, Giuseppe, Braga, Vittorio F., Chaboyer, Brian, Crestani, Juliana, Dall’Ora, Massimo, Fabrizio, Michele, Fiorentino, Giuliana, Monelli, Matteo, Neeley, Jillian R., Stetson, Peter B., Thévenin, Frédéric

“…Abstract We present new period- ϕ 31 -[Fe/H] relations for first-overtone RRL stars (RRc), calibrated over a broad range of metallicities (−2.5 ≲ [Fe/H] ≲ 0.0)…”
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On the Dwarf Irregular Galaxy NGC 6822. I. Young, Intermediate, and Old Stellar Populations by Tantalo, Maria, Dall’Ora, Massimo, Bono, Giuseppe, Stetson, Peter B., Fabrizio, Michele, Ferraro, Ivan, Nonino, Mario, Braga, Vittorio F., da Silva, Ronaldo, Fiorentino, Giuliana, Iannicola, Giacinto, Marengo, Massimo, Monelli, Matteo, Mullen, Joseph P., Pietrinferni, Adriano, Salaris, Maurizio

“…Abstract We present accurate and deep multiband ( g , r , i ) photometry of the Local Group dwarf irregular galaxy NGC 6822. The images were collected with…”
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The GALAH survey: tracing the Milky Way’s formation and evolution through RR Lyrae stars by D’Orazi, Valentina, Storm, Nicholas, Casey, Andrew R, Braga, Vittorio F, Zocchi, Alice, Bono, Giuseppe, Fabrizio, Michele, Sneden, Christopher, Massari, Davide, Giribaldi, Riano E, Bergemann, Maria, Campbell, Simon W, Casagrande, Luca, de Grijs, Richard, De Silva, Gayandhi, Lugaro, Maria, Zucker, Daniel B, Bragaglia, Angela, Feuillet, Diane, Fiorentino, Giuliana, Chaboyer, Brian, Dall’Ora, Massimo, Marengo, Massimo, Martínez-Vázquez, Clara E, Matsunaga, Noriyuki, Monelli, Matteo, Mullen, Joseph P, Nataf, David, Tantalo, Maria, Thevenin, Frederic, Vitello, Fabio R, Kudritzki, Rolf-Peter, Bland-Hawthorn, Joss, Buder, Sven, Freeman, Ken, Kos, Janez, Lewis, Geraint F, Lind, Karin, Martell, Sarah, Sharma, Sanjib, Stello, Dennis, Zwitter, Tomaž

“…ABSTRACT Stellar mergers and accretion events have been crucial in shaping the evolution of the Milky Way (MW). These events have been dynamically identified…”
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Impact of Distance Determinations on Galactic Structure. II. Old Tracers by Kunder, Andrea, Valenti, Elena, Dall’Ora, Massimo, Pietrukowicz, Pawel, Sneden, Chris, Bono, Giuseppe, Braga, Vittorio F., Ferraro, Ivan, Fiorentino, Giuliana, Iannicola, Giacinto, Marconi, Marcella, Martínez-Vázquez, Clara E., Monelli, Matteo, Musella, Ilaria, Ripepi, Vincenzo, Salaris, Maurizio, Stetson, Peter B.

“…Here we review the efforts of a number of recent results that use old tracers to understand the build up of the Galaxy. Details that lead directly to using…”
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Confirmation of a New Metal-poor Globular Cluster in the Galactic Bulge by Minniti, Dante, Schlafly, E. F., Palma, Tali, Clariá, Juan J., Hempel, Maren, Alonso-García, Javier, Bica, Eduardo, Bonatto, Charles, Braga, Vittorio F., Clementini, Gisella, Garofalo, Alessia, Gómez, Matías, Ivanov, Valentin D., Lucas, Phillip W., Pullen, Joyce, Saito, Roberto K., Smith, Leigh C.

“…Abstract We use deep near-IR photometry of the VISTA Variables in the Vía Láctea (VVV) Survey and deep DECam Plane Survey (DECaPS) optical photometry to…”
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Accretion onto the Supermassive Black Hole in the High-redshift Radio-loud AGN 0957+561 by Gil-Merino, Rodrigo, Goicoechea, Luis J, Shalyapin, Vyacheslav N, Braga, Vittorio F

“…We present the results of our X-ray, UV, and optical monitoring campaign of the first gravitationally lensed active galactic nucleus (AGN) from late 2009 to…”
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Confirmation of a New Metal-poor Globular Cluster in the Galactic Bulge∗ ∗ Based on observations collected at the European Organisation for Astronomical Research in the Southern Hemisphere under ESO programmes 179.B-2002 and 298.D-5048 by Minniti, Dante, Schlafly, E. F., Palma, Tali, Clariá, Juan J., Hempel, Maren, Alonso-García, Javier, Bica, Eduardo, Bonatto, Charles, Braga, Vittorio F., Clementini, Gisella, Garofalo, Alessia, Gómez, Matías, Ivanov, Valentin D., Lucas, Phillip W., Pullen, Joyce, Saito, Roberto K., Smith, Leigh C.

“…We use deep near-IR photometry of the VISTA Variables in the Vía Láctea (VVV) Survey and deep DECam Plane Survey (DECaPS) optical photometry to confirm the…”
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ACCRETION ONTO THE SUPERMASSIVE BLACK HOLE IN THE HIGH-REDSHIFT RADIO-LOUD AGN 0957+561 by GIL-MERINO, Rodrigo, GOICOECHEA, Luis J, SHALYAPIN, Vyacheslav N, BRAGA, Vittorio F

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Variable Star Light Curves in Koopman Space by Mekhaël, Nicolas, Pasquato, Mario, Carenini, Gaia, Braga, Vittorio F, Trevisan, Piero, Bono, Giuseppe, Hezaveh, Yashar

“…We present the first application of data-driven techniques for dynamical system analysis based on Koopman theory to variable stars. We focus on light curves of…”
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Sparse logistic regression for RR Lyrae vs binaries classification by Trevisan, Piero, Pasquato, Mario, Carenini, Gaia, Mekhael, Nicolas, Braga, Vittorio F, Bono, Giuseppe, Abbas, Mohamad

“…RR Lyrae (RRL) are old, low-mass radially pulsating variable stars in their core helium burning phase. They are popular stellar tracers and primary distance…”
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RR Lyrae mid-infrared Period-Luminosity-Metallicity and Period-Wesenheit-Metallicity relations based on Gaia DR3 parallaxes by Mullen, Joseph P, Marengo, Massimo, Martínez-Vázquez, Clara E, Chaboyer, Brian, Bono, Giuseppe, Braga, Vittorio F, Dall'Ora, Massimo, D'Orazi, Valentina, Fabrizio, Michele, Monelli, Matteo, Thévenin, Frédéric

“…We present new empirical infrared Period-Luminosity-Metallicity (PLZ) and Period-Wesenheit-Metallicity (PWZ) relations for RR Lyrae based on the latest Gaia…”
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Type II Cepheids as stellar tracers and distance indicators by Bhardwaj, Anupam, Braga, Vittorio F, Minniti, Dante, Ramos, Rodrigo Contreras, Rejkuba, Marina

“…Type II Cepheids are both useful distance indicators and tracers of old age stellar populations in their host galaxy. We summarize near-infrared observations…”
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