Results 1 to 10 of about 22,056 (167)

Stellar photometry with Multi Conjugate Adaptive Optics [PDF]

SPIE Proceedings, 2016
We overview the current status of photometric analyses of images collected with Multi Conjugate Adaptive Optics (MCAO) at 8-10m class telescopes that operated, or are operating, on sky.
Andersen, David, Bellazzini, Michele, Bono, Giuseppe, Ciliegi, Paolo, Diolaiti, Emiliano, Ferraro, Ivan, Fiorentino, Giuliana, Iannicola, Giacinto, Massari, Davide, McConnachie, Alan, Monelli, Matteo, Schreiber, Laura, Stetson, Peter B., Testa, Vincenzo, Tolstoy, Eline, Turri, Paolo, Veran, Jean-Pierre   +16 more
core   +10 more sources

Chemogenetic Control of Striatal Astrocytes Improves Parkinsonian Motor Deficits in Mice. [PDF]

Glia
Main Points Dopamine depletion reduces locomotion‐induced calcium activity in dorsal striatal astrocytes. Chemogenetic activation facilitates astrocyte locomotion responses and improves motor behavior in dopamine lesioned animals. ABSTRACT Parkinson's disease (PD) is characterized by the degeneration of dopaminergic nigrostriatal inputs, which causes ...
Evans WR, Baskar SS, Vellore A, Costa ARCE, Jacob C, Ravoori S, Arigbe A, Huda R.   +7 more
europepmc   +2 more sources

A comparison of methods to assess the resistance of reinforcing steel against chloride‐induced corrosion in concrete: Particular consideration of 12% chromium steel

Materials and Corrosion, EarlyView., 2021
Several methods to measure the critical chloride content Ccrit of steel in concrete are compared on the basis of 12% chromium steel and carbon steel. The resulting Ccrit depends on the method used. The reasons for this and the corresponding influencing parameters are discussed in this article.
Carolina Boschmann Käthler, Gino Ebell, Sylvia Keßler, Yves Schiegg, Christoph Dauberschmidt, Ueli M. Angst   +5 more
wiley   +1 more source

Reference-less detection, astrometry, and photometry of faint companions with adaptive optics [PDF]

, 2009
We propose a complete framework for the detection, astrometry, and photometry of faint companions from a sequence of adaptive optics corrected short exposures. The algorithms exploit the difference in statistics between the on-axis and off-axis intensity.
Beuzit, Biller, Born, Fitzgerald, Gladysz, Gladysz, Guyon, Hinkley, Itoh, Julian C. Christou, Labeyrie, Lafrenière, Marois, Marois, Masciadri, Roberts, Soummer, Soummer, Sparks, Szymon Gladysz   +19 more
core   +1 more source

Recent Results and Perspectives for Precision Astrometry and Photometry with Adaptive Optics [PDF]

, 2010
Large ground-based telescopes equipped with adaptive optics (AO) systems have ushered in a new era of high-resolution infrared photometry and astrometry. Relative astrometric accuracies of
Clarkson, Will, Do, Tuan, Ghez, Andrea M., Lu, Jessica R., McCrady, Nate, Morris, Mark R., Yelda, Sylvana   +6 more
core   +2 more sources

Characterization of the near-Earth Asteroid 2002NY40 [PDF]

, 2007
In August 2002, the near-Earth asteroid 2002 NY40, made its closest approach to the Earth. This provided an opportunity to study a near-Earth asteroid with a variety of instruments.
Ayers, Baliunas, Benner, Binzel, Bowell, Bradley, Dennis Liang, Doyle T. Hall, Drummond, Fish, Gerwe, Hestroffer, Howell, Hudson, Jacob K. Barros, John L. Africano, John V. Lambert, Jorgensen, Keith T. Knox, Kris M. Hamada, Lewis C. Roberts, Lipschutz, Lucy, McCarthy, Müller, Nishimoto, Paul F. Sydney, Paul W. Kervin, Paxman, Pravec, Ragazzoni, Richardson, Rivkin, Roberts, Saint-Pe, Stetson, Sydney, Tsumuraya   +37 more
core   +1 more source

Vector speckle grid: instantaneous incoherent speckle grid for high-precision astrometry and photometry in high-contrast imaging [PDF]

, 2020
Photometric and astrometric monitoring of directly imaged exoplanets will deliver unique insights into their rotational periods, the distribution of cloud structures, weather, and orbital parameters.
Bos, Steven P.
core   +3 more sources

The Anisoplanatic Point Spread Function in Adaptive Optics [PDF]

, 2006
The effects of anisoplanatism on the adaptive optics point spread function are investigated. A model is derived that combines observations of the guide star with an analytic formulation of anisoplanatism to generate predictions for the adaptive optics ...
Ellerbroek B., M. C. Britton, Tyler G., Tyler G., Veran J.   +4 more
core   +2 more sources

A Sodium laser guide star coupling efficiency measurement method [PDF]

, 2016
Large telescope's adaptive optics (AO) system requires one or several bright artificial laser guide stars to improve its sky coverage. The recent advent of high power sodium laser is perfect for such application.
Bian, Qi, Bo, Yong, Hu, Jing-Yao, Jin, Kai, Li, Yang-Peng, Lu, Feng, Otarola, Angel, Shen, Zhi-Xia, Wei, Kai, Xue, Suijian, Zuo, Jun-Wei   +10 more
core   +2 more sources

Rest-Frame R-band Lightcurve of a z~1.3 Supernova Obtained with Keck Laser Adaptive Optics [PDF]

, 2007
We present Keck diffraction limited H-band photometry of a z~1.3 Type Ia supernova (SN) candidate, first identified in a Hubble Space Telescope (HST) search for SNe in massive high redshift galaxy clusters.
Aldering, G., Barbary, K., Barczys, M., Dawson, K. S., Doi, M., Fadeyev, V., Goldhaber, G., Hattori, T., Ihara, Y., Kashikawa, N., Konishi, K., Koo, D. C., Kowalski, M., Kuznetsova, N., Larkin, J. E., Lidman, C., Max, C., Melbourne, J., Morokuma, T., Perlmutter, S., Rubin, D., Schlegel, D. J., Spadafora, A. L., Steinbring, E., Takanashi, N., Wright, S. A., Yasuda, N.   +26 more
core   +2 more sources