Results 81 to 90 of about 461 (261)
The Astrophysical Journal Supplement SeriesEvolutionary tracks for 2–8 M _⊙ stars, with metallicities of Z = 0.014, 0.006, and 0.002, including rotation, are computed with Modules for Experiments in Stellar Astrophysics ( MESA ).
Radoslaw Smolec +2 more
doaj +1 more source
Excitation of stellar pulsations
, 2011 Invited paper to be published in: Proc. 61st Fujihara Seminar "Progress in solar/stellar physics with helio- and asteroseismology", Shibahashi H., ed., Hakone, 12 pages, 6 ...
openaire +2 more sources
The Role of Opacities in Stellar Pulsation
, 2018 6 pages, 3 Figures, Proceeding for the "Workshop on Astrophysical Opacities"
Kanbur, S. M. +4 more
openaire +3 more sources
Low‐Angle Grain Boundaries and Re‐Segregation in Single‐Crystalline Ni‐Base Superalloys
Advanced Engineering Materials, EarlyView.This work demonstrates that Re‐segregation at low‐angle grain boundaries (LAGBs) in Ni‐base superalloys is influenced by misorientation angle. Advanced microscopy and atom probe tomography reveal that higher misorientation angles increases Re‐segregation.
Alireza B. Parsa +9 more
wiley +1 more source
Time‐Dependent Oxidation and Scale Evolution of a Wrought Co/Ni‐Based Superalloy
Advanced Engineering Materials, EarlyView.This study shows how a new wrought Co/Ni‐based superalloy resists oxidation at 800 ∘$^\circ$C. The oxide scale changes from rough, fast‐growing spinel to a dense, protective chromia–alumina layer. Atom probe analysis reveals tiny refractory‐rich bubbles at the interface that mark the transition to long‐term, diffusion‐controlled protection ...
Cameron Crabb +6 more
wiley +1 more source
The Asteroseismological Richness of RCB and dLHdC Stars
The Astrophysical JournalRCB stars are L ≈ 10 ^4 L _⊙ solar-mass objects that can exhibit large periods of extinction from dust ejection episodes. Many exhibit semi-regular pulsations in the range of 30–50 days with semi-amplitudes of 0.05–0.3 mag.
Tin Long Sunny Wong, Lars Bildsten
doaj +1 more source
Advanced Engineering Materials, EarlyView.The temperature dependence of fatigue behavior in nickel‐based superalloys is investigated through high‐resolution measurements of plastic localization. While increasing temperature reduces localization and enhances fatigue performance in René 88DT, Inconel 718 exhibits a sharp degradation at intermediate temperature due to intensified slip ...
M. Calvat +5 more
wiley +1 more source
Pulsational Mass Loss from Supermassive Stars Creates the Compact Shells of Little Red Dots
The Astrophysical Journal LettersLittle Red Dots (LRDs) have emerged as one of the central puzzles of the JWST era. Their spectra increasingly require dense gas close to the source, yet the physical origin of that cocoon-like structure remains unclear.
Devesh Nandal +5 more
doaj +1 more source
Fatigue Crack Initiation and Growth in Nanocrystalline Ni at Multiple Length‐Scales
Advanced Engineering Materials, EarlyView.Overview of miniaturized in situ SEM fatigue setup and resultant fatigue crack growth data for nanocrystalline Ni. The presented study focuses on the analysis of fatigue crack growth rate (FCGR) in focused ion beam‐notched microcantilevers prepared from nanocrystalline (NC) Ni as a model material.
Igor Moravcik +7 more
wiley +1 more source
Stellar Atmospheric Parameters of ∼11,000 RR Lyrae Stars from LAMOST Spectra
The Astrophysical Journal Supplement SeriesAccurate determination of the stellar atmospheric parameters of RR Lyrae stars (RRLs) requires short individual exposures of the spectra to mitigate pulsation effects.
Jiangtao Wang +4 more
doaj +1 more source