Zobrazeno 1 - 10
of 202
pro vyhledávání: '"Villanova , Sandro"'
Autor:
López-Valdivia, Ricardo, Adame, Lucía, Lagunas, Eduardo Zagala, Román-Zúñiga, Carlos G., Hernández, Jesús, Sánchez, Edilberto, Fernández-Trincado, José G., Carigi, Leticia, Kounkel, Marina, Lane, Richard R., Stassun, Keivan G., Villanova, Sandro
To date, we have access to enormous inventories of stellar spectra that allow the extraction of atmospheric parameters and chemical abundances essential in stellar studies. However, characterizing such a large amount of data is complex and requires a
Externí odkaz:
http://arxiv.org/abs/2407.17640
Autor:
González-Díaz, Danilo, Fernández-Trincado, José G., Villanova, Sandro, Geisler, Doug, Barbuy, Beatriz, Minniti, Dante, Beers, Timothy C., Bidin, Christian Moni, Mauro, Francesco, Muñoz, Cesar, Tang, Baitian, Soto, Mario, Monachesi, Antonela, Lane, Richard R., Frelijj, Heinz
This study presents the results concerning six red giant stars members of the globular cluster NGC 6558. Our analysis utilized high-resolution near-infrared spectra obtained through the CAPOS initiative (the APOgee Survey of Clusters in the Galactic
Externí odkaz:
http://arxiv.org/abs/2310.13054
Very metal-poor stars contain crucial information on the Milky Way's infancy. In our previous study \citep{Plotnikova_2022} we derived a mean age of $\sim$ 13.7 Gyr for a sample of these stars in the Sun's vicinity. In this work, we investigate the c
Externí odkaz:
http://arxiv.org/abs/2303.08056
Autor:
Almeida, Andrés, Anderson, Scott F., Argudo-Fernández, Maria, Badenes, Carles, Barger, Kat, Barrera-Ballesteros, Jorge K., Bender, Chad F., Benitez, Erika, Besser, Felipe, Bizyaev, Dmitry, Blanton, Michael R., Bochanski, John, Bovy, Jo, Brandt, William Nielsen, Brownstein, Joel R., Buchner, Johannes, Bulbul, Esra, Burchett, Joseph N., Díaz, Mariana Cano, Carlberg, Joleen K., Casey, Andrew R., Chandra, Vedant, Cherinka, Brian, Chiappini, Cristina, Coker, Abigail A., Comparat, Johan, Conroy, Charlie, Contardo, Gabriella, Cortes, Arlin, Covey, Kevin, Crane, Jeffrey D., Cunha, Katia, Dabbieri, Collin, Davidson Jr., James W., Davis, Megan C., De Lee, Nathan, Delgado, José Eduardo Méndez, Demasi, Sebastian, Di Mille, Francesco, Donor, John, Dow, Peter, Dwelly, Tom, Eracleous, Mike, Eriksen, Jamey, Fan, Xiaohui, Farr, Emily, Frederick, Sara, Fries, Logan, Frinchaboy, Peter, Gaensicke, Boris T., Ge, Junqiang, Ávila, Consuelo González, Grabowski, Katie, Grier, Catherine, Guiglion, Guillaume, Gupta, Pramod, Hall, Patrick, Hawkins, Keith, Hayes, Christian R., Hermes, J. J., Hernández-García, Lorena, Hogg, David W., Holtzman, Jon A., Ibarra-Medel, Hector Javier, Ji, Alexander, Jofre, Paula, Johnson, Jennifer A., Jones, Amy M., Kinemuchi, Karen, Kluge, Matthias, Koekemoer, Anton, Kollmeier, Juna A., Kounkel, Marina, Krishnarao, Dhanesh, Krumpe, Mirko, Lacerna, Ivan, Lago, Paulo Jakson Assuncao, Laporte, Chervin, Liu, Ang, Liu, Chao, Liu, Xin, Lopes, Alexandre Roman, Macktoobian, Matin, Majewski, Steven R., Malanushenko, Viktor, Maoz, Dan, Masseron, Thomas, Masters, Karen L., Matijevic, Gal, McBride, Aidan, Medan, Ilija, Merloni, Andrea, Morrison, Sean, Myers, Natalie, Mészáros, Szabolcs, Negrete, C. Alenka, Nidever, David L., Nitschelm, Christian, Oravetz, Audrey, Oravetz, Daniel, Pan, Kaike, Peng, Yingjie, Pinsonneault, Marc H., Pogge, Rick, Qiu, Dan, Queiroz, Anna Barbara de Andrade, Ramirez, Solange V., Rix, Hans-Walter, Rosso, Daniela Fernández, Runnoe, Jessie, Salvato, Mara, Sanchez, Sebastian F., Santana, Felipe A., Saydjari, Andrew, Sayres, Conor, Schlaufman, Kevin C., Schneider, Donald P., Schwope, Axel, Serna, Javier, Shen, Yue, Sobeck, Jennifer, Song, Ying-Yi, Souto, Diogo, Spoo, Taylor, Stassun, Keivan G., Steinmetz, Matthias, Straumit, Ilya, Stringfellow, Guy, Sánchez-Gallego, José, Taghizadeh-Popp, Manuchehr, Tayar, Jamie, Thakar, Ani, Tissera, Patricia B., Tkachenko, Andrew, Toledo, Hector Hernandez, Trakhtenbrot, Benny, Trincado, Jose G. Fernandez, Troup, Nicholas, Trump, Jonathan R., Tuttle, Sarah, Ulloa, Natalie, Vazquez-Mata, Jose Antonio, Alfaro, Pablo Vera, Villanova, Sandro, Wachter, Stefanie, Weijmans, Anne-Marie, Wheeler, Adam, Wilson, John, Wojno, Leigh, Wolf, Julien, Xue, Xiang-Xiang, Ybarra, Jason E., Zari, Eleonora, Zasowski, Gail
The eighteenth data release of the Sloan Digital Sky Surveys (SDSS) is the first one for SDSS-V, the fifth generation of the survey. SDSS-V comprises three primary scientific programs, or "Mappers": Milky Way Mapper (MWM), Black Hole Mapper (BHM), an
Externí odkaz:
http://arxiv.org/abs/2301.07688
Autor:
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
We use data from the 17th data release of the Apache Point Observatory Galactic Evolution Experiment (APOGEE 2) to contrast the chemical composition of the recently discovered Gaia Enceladus/Sausage system (GE/S) to those of ten Milky Way (MW) dwarf
Externí odkaz:
http://arxiv.org/abs/2301.01302
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 analyze a sample of 28 extremely metal-poor field stars in the solar vicinity culled from the literatur
Externí odkaz:
http://arxiv.org/abs/2210.11383
Autor:
Fernández-Trincado, José G., Beers, Timothy C., Barbuy, Beatriz, Minniti, Dante, Chiappini, Cristina, Garro, Elisa R., Tang, Baitian, Alves-Brito, Alan, Villanova, Sandro, Geisler, Doug, Lane, Richard R., Diaz, Danilo G.
Publikováno v:
A&A 663, A126 (2022)
(ABRIDGED) We use the 17th data release of the second phase of the Apache Point Observatory Galactic Evolution Experiment (APOGEE-2) to provide a homogenous census of N-rich red giant stars across the Milky Way (MW). We report a total of 149 newly id
Externí odkaz:
http://arxiv.org/abs/2204.09702
Autor:
Baeza, Ian, Fernández-Trincado, José G., Villanova, Sandro, Geisler, Doug, Minniti, Dante, Garro, Elisa R., Barbuy, Beatriz, Beers, Timothy C., Lane, Richard R.
Publikováno v:
A&A 662, A47 (2022)
We present detailed elemental abundances and radial velocities of stars in the metal-poor globular cluster (GC) NGC 2298, based on near-infrared high-resolution ($R\sim$ 22,500) spectra of twelve members obtained during the second phase of the Apache
Externí odkaz:
http://arxiv.org/abs/2204.09703
Autor:
Taylor, Dominic J., Mason, Andrew C., Schiavon, Ricardo P., Horta, Danny, Nataf, David M., Geisler, Doug, Kisku, Shobhit, Phillips, Siân G., Cohen, Roger E., Fernández-Trincado, José G., Beers, Timothy C., Bizyaev, Dmitry, García-Hernández, Domingo Aníbal, Lane, Richard R., Longa-Peña, Penélope, Minniti, Dante, Muñoz, Cesar, Pan, Kaike, Villanova, Sandro
It has been proposed that the globular cluster-like system Terzan 5 is the surviving remnant of a primordial building block of the Milky Way bulge, mainly due to the age/metallicity spread and the distribution of its stars in the $\alpha$-Fe plane. W
Externí odkaz:
http://arxiv.org/abs/2204.01753
In this research we test the ability of a three Washington filter combination, (C-T1)-(T1-T2), compared with that of the traditional C-T1 color to find multiple populations on two globular clusters: NGC 7099 and NGC 1851, types I and II Globular clus
Externí odkaz:
http://arxiv.org/abs/2203.11843