Results 151 to 160 of about 56,706 (218)

Model Choice Matters for Age Inference on the Red Giant Branch [PDF]

arXiv
Galactic archaeology relies on accurate stellar parameters to reconstruct the galaxy's history, including information on stellar ages. While the precision of data has improved significantly in recent years, stellar models used for age inference have not improved at a similar rate.
arxiv  

STELLAR ARCHAEOLOGY IN THE GALACTIC HALO WITH THE ULTRA-FAINT DWARFS. VI. URSA MAJOR II [PDF]

, 2012
M. Dall’Ora, Karen Kinemuchi, V. Ripepi, Christopher T. Rodgers, G. Clementini, Luca Di Fabrizio, H. A. Smith, M. Marconi, I. Musella, Claudia Greco, Charles A. Kuehn, M. Catelan, B. J. Pritzl, Timothy C. Beers   +13 more
openalex   +1 more source

Early r-process Enrichment and Hierarchical Assembly Across the Sagittarius Dwarf Galaxy

The Astronomical Journal
Dwarf galaxies like Sagittarius (Sgr) provide a unique window into the early stages of galactic chemical evolution, particularly through their metal-poor stars.
Xiaowei Ou, Alexander Yelland, Anirudh Chiti, Anna Frebel, Guilherme Limberg, Mohammad K. Mardini   +5 more
doaj   +1 more source

On the Pair-instability Supernova Origin of J1010+2358

The Astrophysical Journal Letters
The first (Population III) stars formed only out of H and He and were likely more massive than present-day stars. Massive Population III stars in the range 140–260 M _⊙ are predicted to end their lives as pair-instability supernovae (PISNe), enriching ...
Ása Skúladóttir, Ioanna Koutsouridou, Irene Vanni, Anish M. Amarsi, Romain Lucchesi, Stefania Salvadori, David S. Aguado   +6 more
doaj   +1 more source

Accurate, Precise, and Physically Self-consistent Ages and Metallicities for 400,000 Solar Neighborhood Subgiant Branch Stars

The Astrophysical Journal
Age is the most difficult fundamental stellar parameter to infer for isolated stars. While isochrone-based ages are in general imprecise for both main-sequence dwarfs and red giants, precise isochrone-based ages can be obtained for stars on the subgiant ...
David M. Nataf, Kevin C. Schlaufman, Henrique Reggiani, Isabel Hahn   +3 more
doaj   +1 more source

Machine learning for galactic archaeology: a chemistry-based neural network method for identification of accreted disc stars [PDF]

, 2022
Thorold Tronrud, P. B. Tissera, Facundo A. Gómez, Robert J. J. Grand, Rüdiger Pakmor, Federico Marinacci, Christine M. Simpson   +6 more
openalex   +1 more source

Four-hundred Very Metal-poor Stars Studied with LAMOST and Subaru. III. Dynamically Tagged Groups and Chemodynamical Properties

The Astrophysical Journal
Very metal-poor (VMP) stars record the signatures of early accreted galaxies, making them essential tools for unraveling the early stages of Galaxy formation.
Ruizhi Zhang, Tadafumi Matsuno, Haining Li, Wako Aoki, Xiang-Xiang Xue, Takuma Suda, Gang Zhao, Yuqin Chen, Miho N. Ishigaki, Jianrong Shi, Qianfan Xing, Jingkun Zhao   +11 more
doaj   +1 more source

Towards Galactic Archaeology with Inferred Ages of Giant Stars From Gaia Spectra [PDF]

Aisha AlMannaei, Daisuke Kawata, Ioana Ciucă, Connor Fallows, Jason L. Sanders, G. M. Seabroke, A. Miglio   +6 more
openalex   +1 more source

Galactic archaeology with [Mg/Mn] versus [Al/Fe] abundance ratios [PDF]

A. Vasini, E. Spitoni, F. Matteuccí
openalex   +1 more source

Where are the most ancient stars in the Milky Way? [PDF]

Mon Not R Astron Soc, 2018
El-Badry K, Bland-Hawthorn J, Wetzel A, Quataert E, Weisz DR, Boylan-Kolchin M, Hopkins PF, Faucher-Giguère CA, Kereš D, Garrison-Kimmel S.   +9 more
europepmc   +1 more source