Results 101 to 110 of about 9,374 (262)

The spectra and ages of blue stragglers

The Astrophysical Journal, 1985
A mechanism similar to Wheeler's quasi-homogeneous evolution and Finzi and Wolf's proposal for blue stragglers is proposed as the origin of the blue stragglers in intermediate-age clusters. Blue stragglers are stars whose positions in color-magnitude diagrams of open and globular clusters are significantly above the turn-off points and in the region of
openaire   +1 more source

Bias‐Engineered Synthetic Antiferromagnets Hosting Sub‐20 nm Zero‐Field Skyrmions at Room Temperature

Advanced Science, EarlyView.
A fully compensated synthetic antiferromagnet (SAF) multilayer exhibits a uniform state at zero field, without skyrmions. We use a SAF bias system to provide RKKY‐mediated exchange bias to the SAF multilayer, promoting zero‐field skyrmion stabilization and polarity control.
Emily Darwin, Riccardo Tomasello, Reshma Peremadathil Pradeep, Mario Carpentieri, Giovanni Finocchio, Hans J. Hug   +5 more
wiley   +1 more source

Merger of Noncompact Binaries: Triggering Mechanisms and Merger Timescales of W UMa Contact Binaries

The Astrophysical Journal
The merger of noncompact binaries can produce a variety of significant celestial objects, including blue stragglers, luminous red novae, and others. However, several key details of the merger of noncompact binaries remain unclear.
Dengkai Jiang, Kun Chen, Jiao Li, Hongwei Ge, Zhenwei Li, Hailiang Chen, Xuefei Chen, Zhanwen Han   +7 more
doaj   +1 more source

The Blue Straggler Star population in NGC6229

The Monthly Notices of the Royal Astronomical Society , 2012
We have used a combination of high-resolution Hubble Space Telescope Wide Field Planetary Camera 2 and wide-field ground-based observations in ultraviolet and optical bands to study the blue straggler star (BSS) population of the outer halo globular cluster NGC 6229 over its entire radial extent.
SANNA, NICOLETTA, DALESSANDRO, EMANUELE, LANZONI, BARBARA, FERRARO, FRANCESCO ROSARIO, G. Beccari, R. T. Rood   +5 more
openaire   +1 more source

Nonlinear Strain‐Mediated Magnetoelectric Coupling in Sub‐Microscale Ni/BPZT Thin‐Film Devices

Advanced Electronic Materials, EarlyView.
Sub‐micrometer Ni/BPZT thin‐film magnetoelectric devices with lateral gates enable localized, low‐voltage strain control of magnetization. By combining anisotropic magnetoresistance, nitrogen‐vacancy magnetometry, multiphysics strain simulations, and micromagnetic modelling, the study quantitatively links ferroelectric strain hysteresis to magnetic ...
Fanfan Meng, Emma Van Meirvenne, Federica Luciano, Xiangyu Wu, Yves Deblock, Kaustuv Banerjee, Peter Rickhaus, Florin Ciubotaru, Christoph Adelmann   +8 more
wiley   +1 more source

The Collision and Merger Products of Stars Do Not Look Alike: A Magnetohydrodynamics Comparison

The Astrophysical Journal
A significant fraction of stars experience close interactions, including collisions resulting from gravitational encounters and mergers within close binary systems.
Pavan Vynatheya, Taeho Ryu, Chen Wang, Alison Sills, Rüdiger Pakmor   +4 more
doaj   +1 more source

Electric Field‐Induced Hole‐ and Electron‐Type Flat Bands in Twisted Double Bilayer Graphene

Advanced Electronic Materials, EarlyView.
The electronic structure of twisted double bilayer graphene is visualized using angle‐resolved photoemission spectroscopy with micrometer spatial resolution at twists of 3.1∘$^\circ$ and 6.0∘$^\circ$ as a function of gate voltage. Tunable hybridization effects and flat band formation occurs between valence and conduction band states due to a finite ...
Zhihao Jiang, Dongkyu Lee, Alfred J. H. Jones, Youngju Park, Paulina Majchrzak, Kimberly Hsieh, Chakradhar Sahoo, Thomas S. Nielsen, Kenji Watanabe, Takashi Taniguchi, Philip Hofmann, Yong P. Chen, Jeil Jung, Søren Ulstrup   +13 more
wiley   +1 more source

Hidden Figures of Globular Clusters: Integrated Stellar Populations Impacted by Hot Subdwarfs

The Astrophysical Journal
Globular clusters (GCs) are fundamental for understanding the integrated light of old stellar populations and galaxy assembly processes. However, the role of hot, evolved stars, such as horizontal branch (HB), extreme HB, and blue stragglers, remains ...
Thayse A. Pacheco, Paula R. T. Coelho, Lucimara P. Martins, Ricardo P. Schiavon, Erik V. R. de Lima, Marcos P. Diaz, Domenico Nardiello, Ronaldo S. Levenhagen, Rogério Riffel, Charles J. Bonatto, Ana L. Chies-Santos   +10 more
doaj   +1 more source

Study of abundance analysis of stars in the spectral range B5 through G2 Final report [PDF]

Photometric and spectroscopic study of blue stragglers, and evolution of stars in ...
Strom, S. E.
core   +1 more source

Tracing mixing in stars: new beryllium observations of the open clusters NGC 2516, Hyades, and M67

, 2007
Determinations of beryllium abundance in stars, together with lithium, provide a key tool to investigate the so far poorly understood extra-mixing processes at work in stellar interiors.
Anders, Asplund, Balachandran, Balachandran, Bodenheimer, Boesgaard, Boesgaard, Boesgaard, Boesgaard, Boesgaard, Brun, Chaboyer, Chaffee, Charbonnel, Charbonnel, Charbonnel, Chieffi, Chmielewski, Ciacio, Dekker, Deliyannis, Deliyannis, Deliyannis, F. Primas, García López, García López, García López, Jeffries, Jones, Kurucz, L. Pasquini, Michaud, Montalbán, Nissen, P. Sestito, Pasquini, Piau, Pilachowski, Pinsonneault, Primas, Pritchet, R. Pallavicini, Randich, Randich, Randich, S. Randich, Sanders, Santos, Schatzman, Sestito, Shetrone, Sills, Sills, Soderblom, Steinhauer, Swenson, Thorburn, Thoul, van Bueren   +58 more
core   +1 more source