Zobrazeno 1 - 10
of 236
pro vyhledávání: '"Chaname, A"'
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
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
Autor:
Casamiquela, L., Olivares, J., Tarricq, Y., Ferrone, S., Soubiran, C., Jofré, P., di Matteo, P., Espinoza-Rojas, F., Castro-Ginard, A., Silva, D. de Brito, Chanamé, J.
Publikováno v:
A&A 664, A31 (2022)
We do a morphological, kinematic and chemical analysis of the disrupting cluster UBC 274 (2.5 Gyr, $d=1778$ pc) to study its global properties. We use HDBSCAN to obtain a new membership list up to 50 pc from its centre and up to magnitude $G=19$ usin
Externí odkaz:
http://arxiv.org/abs/2206.03777
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
Autor:
Melo-Dias, Mateus, Huatuco, Jesenia F.A., Arizapana-Almonacid, Marco A., Castañeda-Tinco, Marco I., Chanamé, Fernán, Passamani, Marcelo
Publikováno v:
In Journal for Nature Conservation September 2024 81
While most moving groups are young and nearby, a small number have been identified in the Galactic halo. Understanding the origin and evolution of these groups is an important piece of reconstructing the formation history of the halo. Here we report
Externí odkaz:
http://arxiv.org/abs/2106.12734