Results 101 to 110 of about 362 (198)

Asteroseismology of Metal-poor Red Giants Observed by TESS

The Astrophysical Journal
Galactic archeology has long been limited by a lack of precise masses and ages for metal-poor stars in the Milky Way’s thick disk. However, with TESS providing a growing number of photometric observations, it is possible to calculate masses and ages for ...
Corin Marasco, Jamie Tayar, David Nidever   +2 more
doaj   +1 more source

A Wave-corrected Assessment of the Local Midplane

The Astrophysical Journal
As the number of known Galactic structures mounts thanks to the Gaia Space Telescope, it is now pertinent to study methods for disentangling structures occupying the same regions of the Milky Way. Indeed, understanding the precise form of each individual
Ziyuan Yin, Austin Hinkel
doaj   +1 more source

The Stellar Abundances for Galactic Archaeology (SAGA) Database – III. Analysis of enrichment histories for elements and two modes of star formation during the early evolution of the Milky Way [PDF]

, 2013
Shimako Yamada, Takuma Suda, Yutaka Komiya, Wako Aoki, Masayuki Y. Fujimoto   +4 more
openalex   +1 more source

On the Origin of Neutron-capture Elements in r-I and r-II Stars: A Differential-abundance Analysis

The Astrophysical Journal
We present a strictly line-by-line differential analysis of a moderately r -process-enhanced star ( r -I: HD 107752) with respect to a strongly r -process-enhanced star ( r -II: CS 31082-0001) to investigate the possible common origin of their heavy ...
Pallavi Saraf, Thirupathi Sivarani, Timothy C. Beers, Yutaka Hirai, Masaomi Tanaka, Carlos Allende Prieto, Drisya Karinkuzhi   +6 more
doaj   +1 more source

A Comprehensive Study of Open Cluster Chemical Homogeneity Using APOGEE and Milky Way Mapper Abundances

The Astrophysical Journal
Stars in an open cluster are assumed to have formed from a broadly homogeneous distribution of gas, implying that they should be chemically homogeneous.
Amaya Sinha, Gail Zasowski, Peter Frinchaboy, Katia Cunha, Diogo Souto, Jamie Tayar, Keivan Stassun   +6 more
doaj   +1 more source

Galactic Archaeology with asteroseismic ages: Evidence for delayed gas infall in the formation of the Milky Way disc [PDF]

, 2019
E. Spitoni, V. Silva Aguirre, F. Matteucci, F. Calura, V. Grisoni   +4 more
openalex   +1 more source

The R-process Alliance: Enrichment of r-process Elements in a Simulated Milky Way–like Galaxy

The Astrophysical Journal
We study the formation of stars with varying amounts of heavy elements synthesized by the rapid neutron-capture process ( r -process) based on our detailed cosmological zoom-in simulation of a Milky Way–like galaxy with an N -body/smoothed particle ...
Yutaka Hirai, Timothy C. Beers, Young Sun Lee, Shinya Wanajo, Ian U. Roederer, Masaomi Tanaka, Masashi Chiba, Takayuki R. Saitoh, Vinicius M. Placco, Terese T. Hansen, Rana Ezzeddine, Anna Frebel, Erika M. Holmbeck, Charli M. Sakari   +13 more
doaj   +1 more source

Detection of early-universe gravitational-wave signatures and fundamental physics. [PDF]

Gen Relativ Gravit, 2022
Caldwell R, Cui Y, Guo HK, Mandic V, Mariotti A, No JM, Ramsey-Musolf MJ, Sakellariadou M, Sinha K, Wang LT, White G, Zhao Y, An H, Bian L, Caprini C, Clesse S, Cline JM, Cusin G, Fornal B, Jinno R, Laurent B, Levi N, Lyu KF, Martinez M, Miller AL, Redigolo D, Scarlata C, Sevrin A, Haghi BSE, Shu J, Siemens X, Steer DA, Sundrum R, Tamarit C, Weir DJ, Xie KP, Yang FW, Zhou S.   +37 more
europepmc   +1 more source

Galactic archaeology with the oldest stars in the Milky Way

, 2020
Anke Arentsen
openalex   +2 more sources

Potassium Abundances in Extremely Metal Poor Stars: Implications for Nucleosynthesis in the Final Stages of Massive Star Evolution

The Astrophysical Journal
We present a potassium (K) abundance analysis in extremely metal-poor (EMP) stars based on high-resolution ( R  ∼ 60,000) spectra obtained with the High Dispersion Spectrograph on the Subaru Telescope, covering the K i resonance lines at 766 and 769 nm ...
Miho N. Ishigaki, Nozomu Tominaga, Wako Aoki, Shinya Wanajo, Tomoya Takiwaki, Ko Nakamura, Nobuyuki Iwamoto, Ken’ichi Nomoto, Chiaki Kobayashi   +8 more
doaj   +1 more source