Results 51 to 60 of about 56,706 (218)
The Astrophysical Journal, 2023 Orbital characteristics based on Gaia Early Data Release 3 astrometric parameters are analyzed for ∼1700 r -process-enhanced (RPE; [Eu/Fe] > +0.3) metal-poor stars ([Fe/H] ≤ −0.8) compiled from the R -Process Alliance, the GALactic Archaeology with ...
Derek Shank +10 more
doaj +1 more source
Studying Young Stars with Large Spectroscopic Surveys [PDF]
, 2015 Galactic archaeology is the study of the history of star formation and chemical evolution in the Milky Way, based on present-day stellar populations. Studies of young stars are a key anchor point for Galactic archaeology, since quantities like the initial mass function and the star formation rate can be studied directly in young clusters and star ...
arxiv +1 more source
The Astrophysical Journal, 2023 We find that the chemical abundances and dynamics of APOGEE and GALAH stars in the local stellar halo are inconsistent with a scenario in which the inner halo is primarily composed of debris from a single massive, ancient merger event, as has been ...
Thomas Donlon II, Heidi Jo Newberg
doaj +1 more source
Disentangling Stellar Age Estimates from Galactic Chemodynamical Evolution
The Astrophysical Journal, 2023 Stellar ages are key for determining the formation history of the Milky Way, but are difficult to measure precisely. Furthermore, methods that use chemical abundances to infer ages may entangle the intrinsic evolution of stars with the chemodynamical ...
Jeff Shen +4 more
doaj +1 more source
Finding r-II Sibling Stars in the Milky Way with the Greedy Optimistic Clustering Algorithm
The Astrophysical Journal, 2023 R -process enhanced stars with [Eu/Fe] ≥ +0.7 (so-called r -II stars) are believed to have formed in an extremely neutron-rich environment in which a rare astrophysical event (e.g., a neutron-star merger) occurred.
Kohei Hattori +2 more
doaj +1 more source
Journal of Quaternary Science, EarlyView.ABSTRACT A Late Upper Paleolithic (LUP) site containing Ahrensburgian‐type stone tools has been discovered at South Cuidrach, Isle of Skye, Scotland. Together with a group of intertidal stone circular alignments also recently discovered on the island, this new evidence for the occupation of northern Scotland also represents the most northerly LUP site ...
Karen Hardy +5 more
wiley +1 more source
Transactions of the Philological Society, EarlyView.Abstract Ancient Maya texts are informationally dominated by hieroglyphic inscriptions and visually dominated by figural art with distinctly formed hands. The hands suggest iconographically embedded hand signs, which would constitute a unique modality of semantic expression and a discourse complement to hieroglyphic writing.
Rich A. Sandoval
wiley +1 more source
The APO-K2 Catalog. II. Accurate Stellar Ages for Red Giant Branch Stars across the Milky Way
The Astronomical JournalWe present stellar age determinations for 4661 red giant branch stars in the APO-K2 catalog, derived using mass estimates from K2 asteroseismology from the K2 Galactic Archaeology Program and elemental abundances from the Apache Point Galactic Evolution ...
Jack T. Warfield +13 more
doaj +1 more source
The Astrophysical Journal, 2023 We report the discovery of Pegasus IV, an ultra-faint dwarf galaxy found in archival data from the Dark Energy Camera processed by the DECam Local Volume Exploration Survey. Pegasus IV is a compact, ultra-faint stellar system ( ${r}_{1/2}={41}_{-6}^{+8}$
W. Cerny +33 more
doaj +1 more source
The K2 Galactic Archaeology Program Data Release 1: Asteroseismic results from Campaign 1 [PDF]
, 2016 NASA's K2 mission is observing tens of thousands of stars along the ecliptic, providing data suitable for large scale asteroseismic analyses to inform galactic archaeology studies. Its first campaign covered a field near the north galactic cap, a region never covered before by large asteroseismic-ensemble investigations, and was therefore of particular
arxiv +1 more source