Zobrazeno 1 - 10
of 92
pro vyhledávání: '"Chaname, Julio"'
Autor:
Cavieres, Manuel, Chanamé, Julio, Navarrete, Camila, Ordenes-Briceño, Yasna, Garavito-Camargo, Nicolás, Besla, Gurtina, Hempel, Maren, Vivas, Katherina, Gómez, Facundo
The infall of the LMC into the Milky Way's halo impacts the distribution of stars and dark matter in our Galaxy. Mapping the observational consequences of this encounter can inform us about the properties of both galaxies, details of their interactio
Externí odkaz:
http://arxiv.org/abs/2410.00114
Autor:
Reggiani, Henrique, Galarza, Jhon Yana, Lorenzo-Oliveira, Diego, Covarrubias, Sofia, Oyague, Micaela, Valle, Rita, Chanamé, Julio
Measurement of lithium abundances in solar-type stars have shown that standard models of stellar evolution are incapable of explaining the observed depletion as a function of stellar age. Beryllium is one of the lightest elements that can be measured
Externí odkaz:
http://arxiv.org/abs/2408.10999
Autor:
Tregoning, Kyle R., Andrews, Jeff J., Agüeros, Marcel A., Cargile, Phillip A., Chanamé, Julio, Curtis, Jason L., Schuler, Simon C.
The application of clustering algorithms to the Gaia astrometric catalog has revolutionized our census of stellar populations in the Milky Way, including the discovery of many new, dispersed structures. We focus on one such structure, Theia 456 (COIN
Externí odkaz:
http://arxiv.org/abs/2405.13133
Publikováno v:
A&A 690, A367 (2024)
Low-mass giants with large amounts of lithium (Li) have challenged stellar evolution for decades. One of the possibilities usually discussed to explain them involves the interaction with a close binary companion. This predicts that when compared agai
Externí odkaz:
http://arxiv.org/abs/2401.00049
Gyrochronology can yield useful ages for field main-sequence stars, a regime where other techniques are problematic. Typically, gyrochronology relations are calibrated using young ($\lesssim 2$ Gyr) clusters, but the constraints at older ages are sca
Externí odkaz:
http://arxiv.org/abs/2210.01137
Publikováno v:
A&A 670, A73 (2023)
Although not predicted by standard stellar evolution, the surface abundance of light elements, such as lithium (Li), carbon, and nitrogen, changes during the red giant branch (RGB) as a result of extra-mixing. This is associated usually with thermoha
Externí odkaz:
http://arxiv.org/abs/2207.08905
The improved astrometry precision of Gaia-eDR3 allows us to perform a detailed study of the Upper Scorpius OB association and revisit its spatial, kinematic, and age substructure. We achieve this by combining clustering techniques and complementing w
Externí odkaz:
http://arxiv.org/abs/2205.01735
Autor:
Andrews, Jeff J., Curtis, Jason L., Chanamé, Julio, Agüeros, Marcel A., Schuler, Simon C., Kounkel, Marina, Covey, Kevin R.
Our view of the variety of stellar structures pervading the local Milky Way has been transformed by the application of clustering algorithms to the Gaia catalog. In particular, several stellar streams have been recently discovered that are comprised
Externí odkaz:
http://arxiv.org/abs/2110.06278
Known sources of lithium (Li) in the universe include the big bang, novae, asymptotic giant branch stars, and cosmic ray spallation. During their longer-lived evolutionary phases, stars are not expected to add to the Li budget of the Galaxy, but to l
Externí odkaz:
http://arxiv.org/abs/2109.13955
The abundance ratios of some chemical species have been found to correlate with stellar age, leading to the possibility of using stellar atmospheric abundances as stellar age indicators. These chemical clocks have been calibrated with solar-twins, op
Externí odkaz:
http://arxiv.org/abs/2105.01096