Results 21 to 30 of about 142,268 (297)

Massive Star Formation in Metal-Enriched Haloes at High Redshift

open access: yesThe Open Journal of Astrophysics, 2020
The formation of supermassive stars has generally been studied under the assumption of rapid accretion of pristine metal-free gas. Recently it was found, however, that gas enriched to metallicities up to Z + 10^-3 Solar can also facilitate supermassive ...
Zoltán Haiman   +3 more
doaj   +1 more source

A Surprising Lack of Metallicity Evolution with Redshift in the Long Gamma-Ray Burst Host Galaxy Population

open access: yesThe Astrophysical Journal, 2023
The number of long-duration gamma-ray burst (LGRB) host galaxies with measured metallicities and host masses has expanded sufficiently to investigate how the distributions of these properties change with redshift.
J. F. Graham, P. Schady, A. S. Fruchter
doaj   +1 more source

High-resolution Spectroscopic Metallicities of Milky Way Cepheid Standards and Their Impact on the Leavitt Law and the Hubble Constant

open access: yesThe Astrophysical Journal Letters, 2023
Milky Way Cepheid variables with accurate Hubble Space Telescope photometry have been established as standards for primary calibration of the cosmic distance ladder to achieve a percent-level determination of the Hubble constant ( H _0 ).
Anupam Bhardwaj   +12 more
doaj   +1 more source

Photometric Metallicity and Distance Estimates for ∼136,000 RR Lyrae Stars from Gaia Data Release 3

open access: yesThe Astrophysical Journal, 2023
We present a sample of 135,873 RR Lyrae stars (RRLs) with precise photometric metallicity and distance estimates from our newly calibrated P – ϕ _31 – R _21 –[Fe/H]/ P – R _21 –[Fe/H] and G -band absolute magnitude–metallicity relations.
Xin-Yi Li   +4 more
doaj   +1 more source

Spintronic phase transition of graphene/BN/graphene van de Waals heterostructures

open access: yesResults in Physics, 2022
Based on a single-orbital tight-binding (TB) Hubbard model under mean-field approximation, we study band structure and half-metallicity of zigzag graphene/boron nitride/graphene (Z-G/BN/G) trilayer nanoribbon systems.
Quanyuan Cao, Lei Xu, Jun Zhang
doaj   +1 more source

Heavy Metal Rules. I. Exoplanet Incidence and Metallicity

open access: yesGeosciences, 2019
The discovery of only a handful of exoplanets required establishing a correlation between giant planet occurrence and metallicity of their host stars.
Vardan Adibekyan
doaj   +1 more source

THE STUDY OF GALACTIC BEAT CEPHEIDS WITH APPLICATION OF ITS RESULTS TO THOSE IN THE MAGELLANIC CLOUDS

open access: yesOdessa Astronomical Publications, 2014
A thorough study of the correlation between P1=P0 ratio, fundamental period, and chemical composition (abundances of metals that compose Z) was conducted to investigate the significance of the iron-peak elements on the ratio. The results suggested a more
F. A. Chekhonadskikh   +2 more
doaj   +1 more source

Metal to Orthogonal Metal Transition* [PDF]

open access: yesChinese Physics Letters, 2020
Orthogonal metal is a new quantum metallic state that conducts electricity but acquires no Fermi surface (FS) or quasiparticles, and hence orthogonal to the established paradigm of Landau’s Fermi-liquid (FL). Such a state may hold the key of understanding the perplexing experimental observations of quantum metals that are beyond FL ...
Chen, Chuang   +3 more
openaire   +4 more sources

Cluster melting: new, limiting, and liminal phenomena

open access: yesAdvances in Physics: X, 2018
The thermodynamic behaviour of clusters and nanoscale structures is both a challenge to the statistical basis of the theory, and of paramount importance to experiment.
Nicola Gaston
doaj   +1 more source

Metal–metal bonded compounds and metal clusters [PDF]

open access: yesInorganica Chimica Acta, 2015
Preface.
Larry R. Falvello, Carlos A. Murillo
openaire   +3 more sources

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