Results 51 to 60 of about 94,786 (300)

Variables in the Southern Polar Region Evryscope 2016 Dataset [PDF]

, 2019
The regions around the celestial poles offer the ability to find and characterize long-term variables from ground-based observatories. We used multi-year Evryscope data to search for high-amplitude (~5% or greater) variable objects among 160,000 bright ...
Barlow, Brad N., Corbett, Henry T., del Ser, Daniel, Fors, Octavi, Glazier, Amy, Howard, Ward S., Law, Nicholas M., Ratzloff, Jeffrey K., Trifonov, Trifon   +8 more
core   +3 more sources

Recycling of NiTi Shape Memory Alloys: Fundamental and Technological Aspects of a Vacuum Induction Melting Processing Route

Advanced Engineering Materials, EarlyView.
The present study investigates recycling of NiTi shape memory alloys via vacuum induction melting. An ingot was synthesized from elemental Ni and Ti and subjected to three subsequent remelting cycles. Remelting increases process durations and impurity levels and adversely affects microstructures and functional properties.
Sakia Sophia Noorzayee, Son Tung Mai, Sarath Menon, Braulio Gadiel Sánchez Ortega, Ralf Drautz, Alexander Kauffmann, Gunther Eggeler, Jan Frenzel   +7 more
wiley   +1 more source

Chemical Links between a Young M-type T Tauri Star and Its Substellar Companion: Spectral Analysis and C/O Measurement of DH Tau A

The Astrophysical Journal
The chemical abundance measurements of host stars and their substellar companions provide a powerful tool to trace the formation mechanism of the planetary systems.
Neda Hejazi, Jerry W. Xuan, David R. Coria, Erica Sawczynec, Ian J. M. Crossfield, Paul I. Cristofari, Zhoujian Zhang, Maleah Rhem   +7 more
doaj   +1 more source

The theoretical instability strip of M dwarf stars [PDF]

Monthly Notices of the Royal Astronomical Society, 2013
The overstability of the fundamental radial mode in M dwarf models was theoretically predicted by Rodríguez-López et al. (2012). The periods were found to be in the ranges ~25-40 min and ~4-8 h, depending on stellar age and excitation mechanism. We have extended our initial M dwarf model grid in mass, metallicity, and mixing length parameter.
Rodríguez-López, Cristina, MacDonald, J, Amado, Pedro J., Moya, A., Mullan, D.   +4 more
openaire   +3 more sources

Longitudinally Modulated Dynamo Action in Simulated M-dwarf Stars

The Astrophysical Journal, 2022
Abstract M-dwarf stars are well known for the intense magnetic activity that many of them exhibit. In cool stars with near-surface convection zones, this magnetic activity is thought to be driven largely by the interplay of convection and the large-scale differential rotation and circulations it establishes.
Connor P. Bice, Juri Toomre
openaire   +2 more sources

Hot DAVs : a probable new class of pulsating white dwarf stars [PDF]

, 2013
We have discovered a pulsating DA white dwarf at the lower end of the temperature range 45 000–30 000 K where a few helium atmosphere white dwarfs are known. There are now three such pulsators known, suggesting that a new class of theoretically predicted
B. T. Gänsicke, Brinkworth, C. M. Copperwheat, Costa, D. W. Kurtz, Dhillon, Dufour, Dufour, Dufour, Eisenstein, Eisenstein, Finley, Fontaine, Fontaine, Fontaine, H. Shibahashi, Homeier, Horne, Hügelmeyer, Kawaler, Kleinman, Kleinman, Kurtz, Lanz, Lehner, Liebert, Marsh, Montgomery, Napiwotzki, Nitta, Provencal, Robinson, S. G. Parsons, S. P. Littlefair, Shibahashi, Shibahashi, T. R. Marsh, V. S. Dhillon, Vennes, Vuille, Wickramasinghe, Winget, Winget   +42 more
core   +2 more sources

Low Cycle Repetitive Loading of Ti‐6Al‐4V‐Epoxy Composite Lattice Structures for Enhanced Energy Dissipation and Damage Tolerance

Advanced Engineering Materials, EarlyView.
Composite Ti–6Al–4V–epoxy lattice structures are additively manufactured and epoxy infiltrated for cyclic loading. At low lattice volume fractions, hybridization produces synergistic gains in stiffness and energy dissipation. At higher volume fractions, synergy diminishes, although composites still exceed metallic lattices in specific energy ...
Joey Tallon, Jordan Noronha, Justin Dirrenberger, Andrey Molotnikov   +3 more
wiley   +1 more source

Ultrasmall High‐Entropy Materials: Nanoscale Effects, Synthesis, and Mechanistic Insights

Advanced Functional Materials, EarlyView.
This review article focuses on sub‐10 nm high‐entropy materials that combine nanoscale design with complex compositions for next‐generation applications. ABSTRACT Ultrasmall high‐entropy nanomaterials (USHENMs, <10 nm) merge multicomponent chemistry with size‐dependent effects, forming a distinct class of materials with unprecedented properties.
Yueyue He, Wenbo Wang, Simon Schweidler, Yanjiao Ma, Ben Breitung, Torsten Brezesinski   +5 more
wiley   +1 more source

Stellar Atmospheric Parameters for Cool Dwarfs in Gaia Data Release 3

The Astrophysical Journal Supplement Series
We provide a catalog of atmospheric parameters for 1,806,921 cool dwarfs from Gaia Data Release 3 (DR3) that lie within the range covered by LAMOST cool dwarf spectroscopic parameters: 3200 K < T _eff < 4300 K, −0.8 < [M/H] < 0.2 dex, and 4.5 < log g < 5.
Cai-Xia Qu, A-Li Luo, Rui Wang, Hugh R. A. Jones, Bing Du, Xiang-Lei Chen, You-Fen Wang   +6 more
doaj   +1 more source

White Dwarf/M Dwarf Binaries as Single Degenerate Progenitors of Type Ia Supernovae

, 2012
Limits on the companions of white dwarfs in the single degenerate scenario for the origin of Type Ia supernovae (SNIa) have gotten increasingly tight. The only type of non-degenerate stars that survive the limits on the companions of SNIa in SNR 0509-67 ...
Andronov, Badenes, Badenes, Birkby, Blondin, Bloom, Bochanski, Bochanski, Browning, Campbell, Chatzopoulos, Chomiuk, Dan, Delfosse, Di Stefano, Di Stefano, Falcon, Fryer, Gerardy, Gerardy, González Hernández, González Hernández, Hachisu, Hachisu, Hilton, Höflich, Höflich, Ivanova, J. Craig Wheeler, Kasen, Kerzendorf, Kerzendorf, King, King, Knigge, Law, Leonard, Li, Li, Liebert, Liebert, MacDonald, Maoz, Marietta, Mullan, Napiwotzki, Nielsen, Pan, Patat, Piro, Pritchet, Reiners, Rest, Romani, Schaefer, Schaefer, Schaefer, Schaefer, Shen, Simon, Starrfield, Stassun, Tutukov, van den Heuvel, van Teeseling, Verbunt, Wang, Wheeler, Wheeler, Wheeler, Willems, Wu, Zahn, Zahn   +73 more
core   +1 more source