Zobrazeno 1 - 10
of 444
pro vyhledávání: '"Stefano, O"'
Autor:
Souza, Stefano O., Valentini, Marica, Chiappini, Cristina, Pérez-Villegas, Angeles, Montalbán, Josefina, Bossini, Diego, Barbuy, Beatriz, Elsworth, Yvonne, Garcia, Rafael A.
The Galactic bulge hosts the Milky Way's oldest stars, possibly coming from disrupted globular clusters (GCs) or the bulge's primordial building blocks, making these stars witnesses to the Galaxy's early chemical enrichment. The Galactic bar currentl
Externí odkaz:
http://arxiv.org/abs/2411.08096
Autor:
Moreno-Hilario, Elizabeth, Martinez-Medina, Luis A., Li, Hui, Souza, Stefano O., Pérez-Villegas, Angeles
Dwarf galaxies are known to exhibit an unusual richness in numbers of globular clusters (GCs), property quantified by the specific frequency ($S_N$), which is high for dwarf and giant elliptical galaxies, but with a minimum for intermediate-mass gala
Externí odkaz:
http://arxiv.org/abs/2310.17396
Autor:
Souza, Stefano O., Ernandes, Heitor, Valentini, Marica, Barbuy, Beatriz, Chiappini, Cristina, Pérez-Villegas, Angeles, Ortolani, Sergio, Friaça, Amâncio C. S., Queiroz, Anna B. A., Bica, Eduardo
Publikováno v:
A&A 671, A45 (2023)
The information on Galactic assembly time is imprinted on the chemodynamics of globular clusters. This makes them important probes that help us to understand the formation and evolution of the Milky Way. Discerning between in-situ and ex-situ origin
Externí odkaz:
http://arxiv.org/abs/2301.05227
Autor:
Limberg, Guilherme, Souza, Stefano O., Pérez-Villegas, Angeles, Rossi, Silvia, Perottoni, Hélio D., Santucci, Rafael M.
We combine spectroscopic, photometric, and astrometric information from APOGEE data release 17 and $Gaia$ early data release 3 to perform a self-consistent characterization of $Gaia$-Sausage/Enceladus (GSE), the remnant of the last major merger exper
Externí odkaz:
http://arxiv.org/abs/2206.10505
Autor:
Souza, Stefano O., Valentini, Marica, Barbuy, Beatriz, Pérez-Villegas, Angeles, Chiappini, Cristina, Ortolani, Sergio, Nardiello, Domenico, Dias, Bruno, Anders, Friedrich, Bica, Eduardo
Publikováno v:
A&A 656, A78 (2021)
Palomar 6 (Pal~6) is a moderately metal-poor globular cluster projected towards the Galactic bulge. A full analysis of the cluster can give hints on the early chemical enrichment of the Galaxy and a plausible origin of the cluster. The aim of this st
Externí odkaz:
http://arxiv.org/abs/2109.04483
Autor:
Romero-Colmenares, María, Fernández-Trincado, José G., Geisler, Doug, Souza, Stefano O., Villanova, Sandro, Minniti, Penélope Longa-Peña Dante, Beers, Timothy C., Bidin, Cristian Moni, Pérez-Villegas, Angeles, Moreno, Edmundo, Garro, Elisa R., Baeza, Ian, Henao, Lady, Barbuy, Beatriz, Alonso-García, Javier, Cohen, Roger E., Lane, Richard R., Muñoz, Cesar
Publikováno v:
A&A 652, A158 (2021)
We present results from a study of fifteen red giant members of the intermediate-metallicity globular cluster (GC) FSR 1758 using high-resolution near-infrared spectra collected with the Apache Point Observatory Galactic Evolution Experiment II surve
Externí odkaz:
http://arxiv.org/abs/2106.00027
Autor:
Limberg, Guilherme, Santucci, Rafael M., Rossi, Silvia, Queiroz, Anna B. A., Chiappini, Cristina, Souza, Stefano O., Perottoni, Hélio D., Pérez-Villegas, Angeles, Barbosa, Fabrícia O.
We identified 8 additional stars as members of the Helmi stream (HStr) in the combined GALAH+ DR3 and $Gaia$ EDR3 catalog. By consistently reevaluating claimed members from the literature, we consolidate a sample of 22 HStr stars with parameters dete
Externí odkaz:
http://arxiv.org/abs/2105.05958
Equilibrium phase transitions between a normal and a photon condensate state (also known as superradiant phase transitions) are a highly debated research topic, where proposals for their occurrence and no-go theorems have chased each other for the pa
Externí odkaz:
http://arxiv.org/abs/2104.09468
Autor:
Fernández-Trincado, José G., Beers, Timothy C., Minniti, Dante, Carigi, Leticia, Placco, Vinicius M., Chun, Sang-Hyun, Lane, Richard R., Geisler, Doug, Villanova, Sandro, Souza, Stefano O., Barbuy, Beatriz, Pérez-Villegas, Angeles, Chiappini, Cristina, Queiroz, Anna. B. A., Tang, Baitian, Alonso-García, Javier, Piatti, Andrés E., Palma, Tali, Alves-Brito, Alan, Bidin, Christian Moni, Roman-Lopes, Alexandre, Muñoz, Ricardo R., Singh, Harinder P., Kundu, Richa, Chaves-Velasquez, Leonardo, Romero-Colmenares, María, Longa-Peña, Penelope, Soto, Mario, Vieira, Katherine
The central (`bulge') region of the Milky Way is teeming with a significant fraction of mildly metal-deficient stars with atmospheres that are strongly enriched in cyanogen ($^{12}$C$^{14}$N). Some of these objects, which are also known as nitrogen-e
Externí odkaz:
http://arxiv.org/abs/2102.01706
Autor:
Fernández-Trincado, José G., Minniti, Dante, Souza, Stefano O., Beers, Timothy C., Geisler, Doug, Bidin, Christian Moni, Villanova, Sandro, Majewski, Steven R., Barbuy, Beatriz, Pérez-Villegas, Angeles, Henao, Lady, Romero-Colmenares, María, Roman-Lopes, Alexandre, Lane, Richard R.
We present the first high-resolution abundance analysis of the globular cluster VVV~CL001, which resides in a region dominated by high interstellar reddening towards the Galactic Bulge. Using \textit{H}-band spectra acquired by the Apache Point Obser
Externí odkaz:
http://arxiv.org/abs/2102.01088