Results 171 to 180 of about 12,886 (274)

The Frequency of Binary Stars in the Core of 47 Tucanae

, 2001
Differential time series photometry has been derived for 46422 main-sequence stars in the core of 47 Tucanae. The observations consisted of near-continuous 160-s exposures alternating between the F555W and F814W filters for 8.3 days in 1999 July with ...
Alard C., Ata Sarajedini, Bacon D., Belloni T., Bertelli G., Bopp B. W., Callanan P. J., Cutispoto G., Davies M. B., Duquennoy A., Elson R. A. W., Heggie D. C., Heggie D. C., Kaluzny J., Kaluzny J., Kaluzny J., Keppens R., Keppens R., Mathieu R. D., Menzies J. W., Meylan G., Michael D. Albrow, Peter D. Edmonds, Portegies Zwart S. F., Puragra Guhathakurta, Rahunen T., Robertson J. A., Ronald L. Gilliland, Timothy M. Brown, van den Berg M., Vilhu O., Yan L.   +31 more
core   +1 more source

Solution‐Like Water Transport Across Molecular to Macroscopic Length Scales in Crosslinked Poly(Ethylene Glycol Diacrylate) Networks With Tailored Sidechains

Journal of Polymer Science, EarlyView.
Cross‐linked PEGDA network microparticles are synthesized with spin labels to sense local water motion. From the nanoscale to the macroscale, PEGDA exhibits rapid, solution‐like water transport as measured by spectroscopic techniques. Addition of side chain chemistries further modulates local water diffusion.
Thomas R. Webber, Declan P. Shannon, Leo W. Gordon, Oscar A. Nordness, Joshua D. Moon, Raphaële J. Clément, Benny D. Freeman, Rachel A. Segalman, Craig J. Hawker, Songi Han   +9 more
wiley   +1 more source

Discovery of a Second Eclipsing, ​​​​​Bursting Neutron Star Low-mass X-Ray Binary in the Globular Cluster Terzan 6

The Astrophysical Journal
We have analyzed Chandra and Suzaku observations of the globular cluster Terzan 6, made when the recurrent transient GRS 1747–312 was in quiescence. Our analysis reveals the presence of a second eclipsing, bursting neutron star low-mass X-ray binary in ...
Maureen van den Berg, Jeroen Homan, Craig O. Heinke, David A. Pooley, Rudy Wijnands, Arash Bahramian, James C. A. Miller-Jones   +6 more
doaj   +1 more source

Detecting and attributing climate change effects on vegetation: Australia as a test case

PLANTS, PEOPLE, PLANET, EarlyView.
Climate change is contributing to vegetation changes that threaten life support systems. Yet, inherent climatic variability and past and present human actions—such as clearing, burning and grazing regimes—also alter vegetation and complicate understanding of vegetation change. Australian ecosystems exemplify such complexity.
Laura J. Williams, Rachael V. Gallagher, Sami W. Rifai, Matthew A. Adeleye, Patrick J. Baker, David M. J. S. Bowman, Jake Eckersley, Jacqueline R. England, Michael‐Shawn Fletcher, Pauline F. Grierson, Assaf Inbar, Jürgen Knauer, Clare M. Stephens, Raphaël Trouvé, Belinda E. Medlyn   +14 more
wiley   +1 more source

Dynamical Evolution of Four Old Galactic Open Clusters Traced by Their Constituent Stars with Gaia DR3

The Astronomical Journal
We investigate the evolutionary stages of four open clusters—Berkeley 39, Collinder 261, NGC 6819, and NGC 7789—of ages ranging from 1.6 to 6 Gyr. These clusters have previously been classified into dynamically young and intermediate age groups based on ...
Shanmugha Balan, Khushboo K. Rao, Kaushar Vaidya, Manan Agarwal, Souradeep Bhattacharya   +4 more
doaj   +1 more source

Shallow Nitrogen Vacancy Color Centers in Diamond by Ion Implantation

Advanced Quantum Technologies, EarlyView.
This study investigates the formation of shallow nitrogen‐vacancy (NV) centers in CVD diamond through broad‐beam ion implantation across a SiO₂ layer. By adjusting the ion incidence angle, the distribution of NV centers is controlled, as predicted by sytopping and range of ions in matter (SRIM) simulations and confirmed by angle‐resolved X‐ray ...
Giorgio Speranza, Alessandro Cian, Breno Perlingeiro Correa, Elena Missale, Andrea Pedrielli, Savino Piccolomo, Alina Samusenko, Elia Scattolo, Danny Zanardo, Roberto Canteri, Georg Pucker, Antonino Picciotto, René Vollmer, Rossana Dell'Anna, Damiano Giubertoni   +14 more
wiley   +1 more source

Dynamical Signatures of Trumpler 19: A Statistical and Photometric Perspective

The Astrophysical Journal
We present a statistical approach to investigating the dynamical evolution of the old open cluster Trumpler 19. We identified 810 cluster members using an ensemble-based unsupervised machine learning method applied to Gaia Data Release 3 astrometric data.
A. H. Sheikh, Biman J. Medhi, Ram Sagar
doaj   +1 more source

Oscillating blue stragglers, γDoradus stars and eclipsing binaries in the open cluster NGC 2506 [PDF]

, 2007
T. Arentoft, J. De Ridder, F. Grundahl, L. Glowienka, C. Waelkens, M. A. Dupret, A. Grigahcène, K. Lefever, Hannes Jensen, M. Reyniers, S. Frandsen, H. Kjeldsen   +11 more
openalex   +1 more source

Terahertz Quantum Imaging

Advanced Quantum Technologies, EarlyView.
The presented quantum imaging technique allows the measurement of spatial amplitude, phase, and spectral information of terahertz radiation after interaction with a sample by only detecting visible photons with a standard, uncooled camera. It offers a promising alternative to traditional terahertz imaging methods like electro‐optical and upconversion ...
Mirco Kutas, Felix Riexinger, Jens Klier, Daniel Molter, Georg von Freymann   +4 more
wiley   +1 more source

MOSTsatellite photometry of stars in the M67 field: eclipsing binaries, blue stragglers and δ Scuti variables^★ [PDF]

, 2008
T. Pribulla, S. M. Ruciński, J. M. Matthews, T. Kallinger, R. Kuschnig, Jason F. Rowe, D. B. Guenther, A. F. J. Moffat, Dimitar Sasselov, G. A. H. Walker, W. W. Weiß   +10 more
openalex   +1 more source