Results 71 to 80 of about 56,706 (218)

Mining an Anthropocene in Japan: On the making and work of geological imaginaries

Transactions of the Institute of British Geographers, EarlyView.
Short Abstract This article addresses how the lithic and the drift might be reworked as an Anthropocene material outside of a chronostratigraphy. Revisiting the finding of a floating fern fossil at the Hashima mine, we delve into a complex array of Geological imaginaries, and undertake our own speculative work.
Deborah P. Dixon, Carina J. Fearnley, Mark Pendleton   +2 more
wiley   +1 more source

Galactic Archaeology and Asteroseismology: A Synergetic Approach

, 2022
The author is supported by Fundação para a Ciência e a Tecnologia (FCT, Portugal) in the form of a work contract (CEECIND/00476/2018).
openaire   +1 more source

Phase-space Properties and Chemistry of the Sagittarius Stellar Stream Down to the Extremely Metal-poor ([Fe/H] ≲ −3) Regime

The Astrophysical Journal, 2023
In this work, we study the phase-space and chemical properties of the Sagittarius (Sgr) stream, the tidal tails produced by the ongoing destruction of the Sgr dwarf spheroidal (dSph) galaxy, focusing on its very metal-poor (VMP; [Fe/H] < −2) content.
Guilherme Limberg, Anna B. A. Queiroz, Hélio D. Perottoni, Silvia Rossi, João A. S. Amarante, Rafael M. Santucci, Cristina Chiappini, Angeles Pérez-Villegas, Young Sun Lee   +8 more
doaj   +1 more source

Structure and Evolution of the Milky Way [PDF]

, 2011
This review discusses the structure and evolution of the Milky Way, in the context of opportunities provided by asteroseismology of red giants. The review is structured according to the main Galactic components: the thin disk, thick disk, stellar halo, and the Galactic bar/bulge.
arxiv   +1 more source

Exploring the Universe with Metal-Poor Stars

, 2011
The early chemical evolution of the Galaxy and the Universe is vital to our understanding of a host of astrophysical phenomena. Since the most metal-poor Galactic stars (with metallicities down to [Fe/H]\sim-5.5) are relics from the high-redshift ...
A Frebel, A Frebel, A Frebel, A Frebel, A Frebel, A Frebel, A Frebel, A Frebel, A Frebel, A Heger, A Heger, A Klypin, A Koch, A Koch, A McWilliam, A Stacy, AP Cooper, AS Font, B Moore, B Robertson, C Chiappini, D Carollo, D Geisler, DK Lai, DN Spergel, E Komatsu, E Starkenburg, E Tolstoy, EN Kirby, EN Kirby, EN Kirby, EN Kirby, G Besla, G Meynet, H Umeda, HN Li, I Iben, J Diemand, J Simmerer, JD Simon, JD Simon, JE Norris, JE Norris, JE Norris, JE Norris, JE Norris, JE Norris, JG Cohen, JG Cohen, JK Hollek, JL Johnson, JP Fulbright, JS Sobeck, KV Johnston, L Liu, L Searle, L Wisotzki, M Bergemann, M Geha, M Limongi, M McQuinn, M Shetrone, M Tafelmeyer, MS Bessell, N Christlieb, N Christlieb, N Iwamoto, N Tominaga, N Yoshida, O Zahn, PC Clark, PS Barklem, R Cayrel, R Lunnan, R Schneider, S Feltzing, SC Keller, SE Woosley, SG Ryan, SG Ryan, T Karlsson, T Schörk, T Shigeyama, T Suda, TC Beers, TC Beers, TH Greif, TH Greif, V Bromm, V Bromm, V Springel, V Springel, V Springel, W Aoki, W Aoki, W Aoki   +95 more
core   +1 more source

Nearshore Hydrodynamics and Sediment Dispersal Along Eroding Permafrost Coasts—Insights From Acoustic Doppler Current Profiler Measurements Around Herschel Island–Qikiqtaruk (Yukon, Canada)

Permafrost and Periglacial Processes, Volume 36, Issue 2, Page 205-216, April/June 2025.
ABSTRACT Permafrost coasts are eroding at an accelerating pace, delivering vast amounts of sediments, organic matter, nutrients, and pollutants into the Arctic Ocean. These fluxes play a crucial role in the coastal biogeochemical cycle, yet their magnitude, as well as the trajectory and fate of the eroded material, is largely unknown.
Justus Gimsa, Michael Fritz, Hugues Lantuit   +2 more
wiley   +1 more source

The Rise of the r-process in the Gaia-Sausage/Enceladus Dwarf Galaxy

The Astrophysical Journal
Neutron star mergers (NSMs) produce r -process elements after a time-delayed inspiral process. Once a significant number of NSMs are present in a galaxy, r -process elements, such as Eu, are expected to significantly increase with time.
Xiaowei Ou, Alexander P. Ji, Anna Frebel, Rohan P. Naidu, Guilherme Limberg   +4 more
doaj   +1 more source

Galactic Surveys in the Gaia Era [PDF]

, 2017
The final astrometric data from the Gaia mission will transform our view of the stellar content of the Galaxy, particularly when complemented with spectroscopic surveys providing stellar parameters, line-of-sight kinematics and elemental abundances. Analyses with Gaia DR1 are already demonstrating the insight gained and the promise of what is to come ...
arxiv   +1 more source

Investigating APOKASC Red Giant Stars with Abnormal Carbon to Nitrogen Ratios [PDF]

arXiv, 2023
The success of galactic archaeology and the reconstruction of the formation history of our galaxy critically relies on precise ages for large populations of stars. For evolved stars in the red clump and red giant branch, the carbon to nitrogen ratio ([C/N]) has recently been identified as a powerful diagnostic of mass and age that can be applied to ...
arxiv  

Galactic Phylogenetics [PDF]

, 2017
Phylogenetics is a widely used concept in evolutionary biology. It is the reconstruction of evolutionary history by building trees that represent branching patterns and sequences. These trees represent shared history, and it is our intention for this approach to be employed in the analysis of Galactic history.
arxiv   +1 more source