Results 151 to 160 of about 199,190 (345)
Large Number of Wolf-Rayet Stars in Emission-Line Galaxies [PDF]
, 1991 J. M. Más-Hesse, D. Kunth
openalex +1 more source
Rotation and Hα Emission in a Young SMC Cluster: A Spectroscopic View of NGC 330
The Astrophysical JournalWe present an analysis of high-resolution optical spectra recorded for 30 stars of the split extended main-sequence turnoff of the young (∼40 Myr) Small Magellanic Cloud globular cluster NGC 330.
Paul I. Cristofari +6 more
doaj +1 more source
Electrical Conductivities of Conductors, Semiconductors, and Their Mixtures at Elevated Temperatures
Advanced Engineering Materials, EarlyView.This article presents a comprehensive review of temperature‐dependent electrical conductivity data for multiple material classes at elevated temperatures, highlighting a persistent conductivity gap between metals and semiconductors in the range of 102$\left(10\right)^{2}$– 107$\left(10\right)^{7}$ S/m. Metal–ceramic irregular metamaterials are proposed
Valentina Torres Nieto, Marcia A. Cooper
wiley +1 more source
Upper limits to coronal line emission from X-ray-detected T Tauri stars [PDF]
, 1985 M. T. V. T. Lago +2 more
openalex +1 more source
The Astrophysical JournalRapid rotation and nonradial pulsations enable Be stars to build decretion disks, where the characteristic line emission forms. A major but unconstrained fraction of Be stars owe their rapid rotation to mass and angular momentum transfer in a binary. The
Robert Klement +10 more
doaj +1 more source
The energy input mechanism into the lower transition regions between stellar chromospheres and coronae [PDF]
The ratio of the emission line fluxes for the C II and C IV lines in the lower transition regions (T = 30,000 to 100,000 K) between stellar chromospheres and transition layers is shown to depend mainly on the temperature gradient in the line emitting ...
Boehm-Vitense, Erika
core +1 more source
Advanced Engineering Materials, EarlyView.Thermomechanical fatigue tests of laser beam powder bed fusion (PBF‐LB) Inconel 718 show that the additively manufactured material reaches almost the lifetimes of conventionally‐rolled material under no‐dwell conditions. Introducing dwell times at the maximum temperature markedly reduces the lifetimes due to pronounced grain boundary sliding associated
Stefan Guth +6 more
wiley +1 more source
Wolf-Rayet Stars in the Milky Way, the Large Magellanic Cloud, and Emission-Line Galaxies [PDF]
, 1993 William D. Vacca
openalex +1 more source
Inclination Bias in Techniques Used to Identify Be Star Candidates
The Astrophysical JournalSeveral methods for identifying Be star candidates are reviewed for observational bias with respect to system inclination, that is the angle between the stellar and disk rotation axis and the observer’s line of sight, with focus on two photometric ...
B. D. Lailey, T. A. A. Sigut
doaj +1 more source
Advanced Engineering Materials, EarlyView.Four‐point bending tests are conducted in an argon atmosphere on commercial MgO‐C brick grades with and without MgO‐C recyclate from room temperature up to 1300 °C. No detrimental effect of the MgO‐C recyclates on bending strength is found. Instead, a decisive influence of the total carbon content is observed, with lower total carbon contents ...
Alexander Schramm +5 more
wiley +1 more source