Results 61 to 70 of about 5,356 (321)

Blue Stragglers in Low-Luminosity Star Clusters

, 2005
We examine the blue straggler populations of 13 low-luminosity (M_V_t >~ -6) globular clusters and 2 old open clusters. These clusters test blue straggler formation in environments intermediate between higher luminosity (and usually higher density ...
Eric L. Sandquist, Ferraro F. R.
core   +2 more sources

The blue stragglers of Omega Centauri

The Astrophysical Journal, 1986
On a obtenu les spectres 3500-5000 A (resolution 3,6 A) de six candidats. Ils ne presentent aucune caracteristique inhabituelle. les vitesses radiales montrent que ces six vagabondes bleues appartiennent a l'amas.
G. S. Da Costa, J. Norris, J. V. Villumsen   +2 more
openaire   +1 more source

A chemical study of M67 candidate blue stragglers and evolved blue stragglers observed with APOGEE DR14 [PDF]

Monthly Notices of the Royal Astronomical Society, 2018
Within the variety of objects populating stellar clusters, blue straggler stars (BSSs) are among the most puzzling ones. BSSs are commonly found in globular clusters, but they are also known to populate open clusters of the Milky Way. Two main theoretical scenarios (collisions and mass transfer) have been suggested to explain their formation, although ...
Bertelli Motta, Clio, Pasquali, Anna, Caffau, Elisabetta, Grebel, Eva K., Bertelli motta, Clio, Grebel, Eva   +5 more
openaire   +3 more sources

Integrated Field‐Free SOT Domain‐Wall Synapses and MTJ Stochastic Neurons for Hardware Boltzmann Machines

Advanced Functional Materials, EarlyView.
Field‐free spin‐orbit torque domain‐wall synapses integrated with stochastic MTJ neurons enable compact hardware Boltzmann machines. Leveraging intrinsic stochasticity and multi‐level conductance, the system achieves efficient probabilistic learning with high accuracy, demonstrating a scalable spintronic platform for energy‐efficient edge AI.
Aijaz H. Lone, Meng Tang, Camelia Florica, Bin He, Jingkai Xu, Selma Amara, Georgian Melinte, Xixiang Zhang, Gianluca Setti   +8 more
wiley   +1 more source

Rapid Fabrication of Self‐Propelled and Steerable Magnetic Microcatheters for Precision Medicine

Advanced Materials, EarlyView.
A rapid Joule heating fabrication method for the production of self‐propelling, adaptive microcatheters, with tunable stiffness and integrated microfluidic channels is presented. Demonstrated through three microrobotic designs, including a steerable guiding catheter, an untethered wave‐crawling TubeBot, and a distal‐end propelled microcatheter, it was ...
Zhi Chen, Boris Rivkin, David Castellanos‐Robles, Ivan Soldatov, Lukas Beyer, Mariana Medina‐Sánchez   +5 more
wiley   +1 more source

Young blue straggler stars in the Galactic field [PDF]

Monthly Notices of the Royal Astronomical Society, 2018
In this study we present an analysis of a sample of field blue straggler (BS) stars that show high ultra violet emission in their spectral energy distributions (SED): indication of a hot white dwarf (WD) companion to BS. Using photometry available in the Sloan Digital Sky Survey (SDSS) and Galaxy Evolution Explorer (GALEX ) surveys we identified 80 ...
Ekanayake, Gemunu, Wilhelm, Ronald
openaire   +2 more sources

Transitory Tidal Heating and Its Impact on Cluster Isochrones

The Astrophysical Journal
The kinetic energy in tidal flows, when converted into heat, can affect the internal structure of a star and shift its location on a color–magnitude diagram from that of standard models.
S. Jane Arthur, Gloria Koenigsberger, Kristin Brady, Diana Estrella-Trujillo, Catherine Pilachowski   +4 more
doaj   +1 more source

Beyond Earth: Resilience of Quasi‐2D Perovskite Solar Cells in Space

Advanced Materials, EarlyView.
In the article (DOI: 10.1002/adma.202520433), Christoph Putz and co‐workers demonstrate rigid quasi‐2D perovskite solar cells operating in low Earth orbit, delivering stable power for more than 100 days under real‐space conditions. In‐orbit performance is correlated with extensive ground‐based thermal and proton‐irradiation studies on rigid and ...
Christoph Putz, Lukas E. Lehner, Stepan Demchyshyn, Bekele Hailegnaw, Phillip Jahelka, Magdalena Breitwieser, Sercan Özen, Andrea Denker, Jürgen Bundesmann, Alina Hanna Dittwald, Dilara Karabulut, Philipp Tockhorn, Steve Albrecht, Felix Lang, Markus C. Scharber, Michael D. Kelzenberg, Harry A. Atwater, Martin Kaltenbrunner   +17 more
wiley   +1 more source

Multiple stellar populations and their influence on blue stragglers

, 2010
It has become clear in recent years that globular clusters are not simple stellar populations, but may host chemically distinct sub-populations, typically with an enhanced helium abundance. These helium-rich populations can make up a substantial fraction
Alexander, Alison Sills, Anders, Angulo, Bedin, Buchler, Böhm-Vitense, Campbell, Cassisi, Chen, Chen, Chen, D'Antona, D'Ercole, De Mink, Dearborn, Decressin, Eggleton, Eggleton, Eldridge, Evert Glebbeek, Ferraro, Ferraro, Ferraro, Formicola, Fujimoto, Fusi Pecci, Glebbeek, Glebbeek, Gratton, Han, Harris, Herwig, Härm, Iben, Iglesias, Kippenhahn, Kippenhahn, Knigge, Kroupa, Leigh, Leigh, Lejeune, Lejeune, Lombardi, Lombardi, Milone, Mocák, Nathan Leigh, Pancino, Piotto, Piotto, Piotto, Pols, Pols, Portegies Zwart, Refsdal, Renzini, Sandage, Saviane, Schlegel, Schröder, Schröder, Sills, Sills, Sills, Sills, Stancliffe, Stancliffe, Ventura, Ventura, Ventura, Ventura, Walker   +73 more
core   +1 more source

Stellar Populations and Variable Stars in the Core of the Globular Cluster M5 [PDF]

, 1997
We report the discovery of a variable blue straggler in the core of the globular cluster M5, based on a 12-hour long series of images obtained with the Planetary Camera aboard the Hubble Space Telescope.
Buonanno R., Kadla Z. I., Kravtsov V. V., Laurent Drissen, Michael M. Shara, Reid N., Yan L.   +6 more
core   +2 more sources