Results 61 to 70 of about 114,517 (388)

Evolutionary and Pulsational Properties of Ultra-massive White Dwarfs. The Role of Oxygen-Neon Phase Separation. [PDF]

, 2018
The 21st European Workshop on White Dwarfs was held in Austin, TX from July 23rd to 27th of 2018Ultra-massive hydrogen-rich white dwarf stars are expected to harbour oxygen/neon cores resulting from semidegenerate carbon burning when the progenitor ...
Althaus, L.G., Camisassa, M.E., Corsico, A.H., De Geronimo, F.C.   +3 more
core   +2 more sources

MAGNETISM OF WHITE DWARFS (intermediate results of a survey for kilogauss magnetic fields in white dwarfs)

Odessa Astronomical Publications, 2017
We shortly present intermidiate results of a survey for weak magnetic fields among degenerate stars (white dwarfs and hot subdwarf stars). Kilogauss upper limits of longitudinal magnetic fields are presented for several brightest DA white dwarfs and new ...
G. Valyavin, S. Bagnulo, S. Fabrika, A. Reisenegger, G. A. Wade, Inwoo Han, D. Monin   +6 more
doaj   +1 more source

Rotation in sdB stars as revealed by stellar oscillations

Open Astronomy, 2018
An interesting opportunity offered by the detection of stellar oscillations is the possibility to infer the internal rotation rate of a star through the so-called rotational splittings. Such seismic measurements remained rather scarce for hot B subdwarf (
Charpinet Stephane, Giammichele Noemi, Zong Weikai, Van Grootel Valérie, Brassard Pierre, Fontaine Gilles   +5 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

White Dwarf Stars as Polytropic Gas Spheres [PDF]

, 2014
We expect that relativistic effects play an important role in compact stars because their electrons are highly degenerate. In this paper, we study the properties of condensed matter in white dwarfs using Newtonian and relativistic polytropic fluid ...
M. Nouh, A. S. Saad, W. H. Elsanhoury, A. Shaker, B. Korany, T. M. Kamel   +5 more
semanticscholar   +1 more source

Learning Crystallographic Disorder: Bridging Prediction and Experiment in Materials Discovery

Advanced Materials, EarlyView.
Machine learning based computational materials discovery workflows have recently proposed thousands of potentially stable crystalline materials. However, the experimental realization of these predictions is often challenging because the models assume perfectly ordered structures.
Konstantin S. Jakob, Aron Walsh, Karsten Reuter, Johannes T. Margraf   +3 more
wiley   +1 more source

Detection of Young Massive White Dwarfs in Core-collapsed Globular Cluster NGC 362

The Astrophysical Journal Letters
Core-collapsed globular clusters are ideal targets to explore the presence of stellar collision products. Here, we have studied 17 far-UV bright white dwarf (WD) members in the globular cluster NGC 362 using data obtained from the Ultra Violet Imaging ...
R. K. S. Yadav, Arvind K. Dattatrey, Annapurni Subramaniam, Geeta Rangwal, Ravi S. Singh   +4 more
doaj   +1 more source

Evidence from K2 for rapid rotation in the descendant of an intermediate-mass star [PDF]

, 2017
Using patterns in the oscillation frequencies of a white dwarf observed by K2, we have measured the fastest rotation rate, 1.13(02) hr, of any isolated pulsating white dwarf known to date.
Bell, Keaton J., Clemens, J. C., Dennihy, E., Dunlap, B. H., Gaensicke, B. T., Hermes, J. J., Kawaler, Steven D., Kepler, S. O., Montgomery, M. H., Redfield, S., Romero, A. D., Tremblay, P. -E.   +11 more
core   +3 more sources

The White Dwarf Binary Pathways Survey I: A sample of FGK stars with white dwarf companions [PDF]

, 2016
The number of spatially unresolved white dwarf plus main-sequence star binaries has increased rapidly in the last decade, jumping from only ∼30 in 2003 to over 3000. However, in the majority of known systems the companion to the white dwarf is a low-mass
S. Parsons, A. Rebassa-Mansergas, M. Schreiber, B. Gansicke, M. Zorotovic, J. Ren   +5 more
semanticscholar   +1 more source

Bi–Sb Co‐Alloying Tunes Photoexcited State Dynamics in (4FPEA)4AgBi1−xSbxI8 Layered Double Perovskites through Structural Confinement

Advanced Optical Materials, EarlyView.
Lead‐free double perovskites are emerging alternatives to lead‐halide analogues, leveraging low toxicity and highly tunable chemical compositions. These materials possess unique carrier dynamics, often governed by self‐trapped exciton (STE)‐mediated recombination.
Joshua K. G. Karlsson, Sami Toikkonen, Noolu Srinivasa Manikanta Viswanath, Alejandro Cortés‐Villena, Raquel E. Galian, Noora Lamminen, G. Krishnamurthy Grandhi, Paola Vivo   +7 more
wiley   +1 more source