Results 71 to 80 of about 167,710 (319)

Efficient Searches for r-Process-Enhanced, Metal-Poor Stars

, 2004
Neutron-capture-enhanced, metal-poor stars are of central importance to developing an understanding of the operation of the r-process in the early Galaxy, thought to be responsible for the formation of roughly half of all elements beyond the iron peak. A
Hill, Honda, N. Christlieb, P.S. Barklem, Sneden, Sneden, T.C. Beers, V. Hill   +7 more
core   +2 more sources

Dynamic Precipitation during High‐Pressure Torsion of a Magnesium–Manganese Alloy

Advanced Engineering Materials, EarlyView.
An ultrafine‐grained alloy is produced by high‐pressure torsion of solutionized Mg–1.35 wt% Mn. Precipitation of nanometer‐scale Mn particles during deformation provides pinning sites. This prevents the formation of a bimodal grain structure and results in a finer grain size than for pure Mg.
Julian M. Rosalie, Anton Hohenwarter
wiley   +1 more source

Milky Way’s Metal-poor Stars Display Chemical Transition near the Solar Radius

The Astrophysical Journal Letters
The metal-poor stars of a galaxy offer insights into that galaxy’s early formation processes and accretion history. Here, we investigate whether the metal-poor stars of our Milky Way Galaxy exhibit any characteristic trends in Galactocentric distance ...
Khyati Malhan
doaj   +1 more source

Segue 1: An Unevolved Fossil Galaxy from the Early Universe [PDF]

, 2013
We present Magellan/MIKE and Keck/HIRES high-resolution spectra of six red giant stars in the dwarf galaxy Segue 1. Including one additional Segue 1 star observed by Norris et al. (2010), high-resolution spectra have now been obtained for every red giant
Frebel, Anna, Kirby, Evan N., Simon, Joshua D.   +2 more
core   +3 more sources

Metal-Poor Stars

, 2008
15 pages, invited review talk, to appear in the ASP conference proceedings of the "Frank N. Bash Symposium 2007: New Horizons in Astronomy", editors: A. Frebel, J. Maund, J.
openaire   +2 more sources

Characterization of Defect Distribution in an Additively Manufactured AlSi10Mg as a Function of Processing Parameters and Correlations with Extreme Value Statistics

Advanced Engineering Materials, EarlyView.
Predicting extreme defects in additive manufacturing remains a key challenge limiting its structural reliability. This study proposes a statistical framework that integrates Extreme Value Theory with advanced process indicators to explore defect–process relationships and improve the estimation of critical defect sizes. The approach provides a basis for
Muhammad Muteeb Butt, Varma Kvvssn, Hossein Laieghi, Zia Uddin, Peyman Ansari, E. Kıvanç Sadak, Can Barış Toprak, Hüseyin Kızıl, Enrico Salvati   +8 more
wiley   +1 more source

A Modified Initial Mass Function of the First Stars with Explodability Theory under Different Enrichment Scenarios

The Astrophysical Journal
The most metal-poor stars record the earliest metal enrichment triggered by Population III stars. By comparing observed abundance patterns with theoretical yields of metal-free stars, physical properties of their first star progenitors can be inferred ...
Ruizheng Jiang, Gang Zhao, Haining Li, Qianfan Xing   +3 more
doaj   +1 more source

Discovery of the Magellanic Stellar Stream Out to 100 kpc

The Astrophysical Journal, 2023
The Magellanic Stream (MS)—an enormous ribbon of gas spanning 140° of the southern sky trailing the Magellanic Clouds—has been exquisitely mapped in the five decades since its discovery.
Vedant Chandra, Rohan P. Naidu, Charlie Conroy, Ana Bonaca, Dennis Zaritsky, Phillip A. Cargile, Nelson Caldwell, Benjamin D. Johnson, Jiwon Jesse Han, Yuan-Sen Ting   +9 more
doaj   +1 more source

Stellar Archaeology -- Exploring the Universe with Metal-Poor Stars

, 2010
The abundance patterns of the most metal-poor stars in the Galactic halo and small dwarf galaxies provide us with a wealth of information about the early Universe.
Aoki, Aoki, Aoki, Aoki, Aoki, Aoki, Aoki, Aoki, Aoki, Aoki, Aoki, Aoki, Aoki, Aoki, Argast, Arlandini, Arnone, Asplund, Barbuy, Barklem, Beers, Beers, Bergemann, Bessell, Bisterzo, Bonifacio, Bromm, Bromm, Bromm, Burris, Carollo, Carretta, Cayrel, Cayrel, Christlieb, Christlieb, Cohen, Cohen, Cohen, Cohen, Cohen, Cohen, Collet, Cowan, Diemand, Feltzing, François, Frebel, Frebel, Frebel, Frebel, Frebel, Frebel, Frebel, Frebel, Frebel, Fröhlich, Fulbright, Fulbright, Geh, Geisler, Hayek, Heger, Hill, Honda, Honda, Honda, Iben, Ito, Ivans, Ivans, Ivans, Iwamoto, Johnson, Johnson, Johnson, Johnson, Johnson, Johnston, Jonsell, Jonsell, Karakas, Karlsson, Kirby, Kirby, Koch, Koch, Kratz, Kratz, Lai, Lai, Lai, Limongi, Lucatello, Masseron, McWilliam, McWilliam, Meynet, Meynet, Norris, Norris, Norris, Norris, Norris, Norris, Norris, Norris, Norris, Plez, Preston, Preston, Preston, Qian, Robertson, Roederer, Roederer, Ryan, Ryan, Ryan, Schatz, Schneider, Schörck, Searle, Shetrone, Shetrone, Shigeyama, Simmerer, Simon, Sivarani, Sivarani, Sneden, Sneden, Sneden, Sobeck, Spergel, Spite, Spite, Springel, Suda, Suda, Tominaga, Travaglio, Umeda, Wanajo, Westin, Wisotzki, Woosley, Yoshida, Zacs   +148 more
core   +1 more source

Composite Electrospun Fibers Containing Optimized B‐ and Cu‐Doped Bioactive Glass Sol‐Gel Particles for Potential Soft Tissue Engineering Applications

Advanced Engineering Materials, EarlyView.
This article describes the preparation and characterization of poly(ε‐caprolactone) electrospun composite fibers incorporating sol‐gel‐derived bioactive glass particles doped with B and Cu. Scanning electron microscopy, energy‐dispersive X‐ray spectroscopy, Fourier‐transform infrared spectroscopy, contact angle, acellular bioactivity, mechanical and ...
Elisa Piatti, Marta Miola, Liliana Liverani, Paolo Sartori, Enrica Verné, Aldo R. Boccaccini   +5 more
wiley   +1 more source