Results 11 to 20 of about 2,240 (218)

The GraF instrument for Imaging Spectroscopy with the Adaptive Optics [PDF]

Experimental Astronomy, 2002
The GraF instrument using a Fabry-Perot interferometer cross-dispersed with a grating was one of the first integral-field and long-slit spectrographs built for and used with an adaptive optics system. We describe its concept, design, optimal observational procedures and the measured performances.
Chalabaev, A., Coarer, E. Le, Rabou, P., Magnard, Y., Petmezakis, P., Mignant, D. Le   +5 more
openaire   +3 more sources

Effects of mirror seeing on high-contrast adaptive optics instruments [PDF]

Journal of Astronomical Telescopes, Instruments, and Systems, 2020
Ground-based direct imaging surveys like the Gemini Planet Imager Exoplanet Survey (GPIES) rely on Adaptive Optics (AO) systems to image and characterize exoplanets that are up to a million times fainter than their host stars. One factor that can reduce AO performance is turbulence induced by temperature differences in the instrument's immediate ...
Melisa Tallis, Vanessa P. Bailey, Bruce Macintosh, Lisa A. Poyneer, Jean-Baptiste Ruffio, Thomas L. Hayward, Fredrik T. Rantakyrö, Jeffrey K. Chilcote, Dmitry Savransky, The GPI Team   +9 more
openaire   +2 more sources

ERIS: revitalising an adaptive optics instrument for the VLT [PDF]

Ground-based and Airborne Instrumentation for Astronomy VII, 2018
ERIS is an instrument that will both extend and enhance the fundamental diffraction limited imaging and spectroscopy capability for the VLT. It will replace two instruments that are now being maintained beyond their operational lifetimes, combine their functionality on a single focus, provide a new wavefront sensing module that makes use of the ...
Davies, R., ESPOSITO, Simone, Schmid, H. -M., Taylor, W., AGAPITO, GUIDO, Agudo Berbel, A., BARUFFOLO, Andrea, Biliotti, V., Biller, B., Black, M., Boehle, A., Briguglio, B., Buron, A., CARBONARO, LUCA, Cortes, A., CRESCI, GIOVANNI, Deysenroth, M., Di Cianno, A., DI RICO, Gianluca, Doelman, D., DOLCI, Mauro, Dorn, R., Eisenhauer, F., FANTINEL, Daniela, FERRUZZI, Debora, Feuchtgruber, H., Förster Schreiber, N., Gao, X., Gemperlein, H., Genzel, R., George, E., Gillessen, S., Giordano, C., Glauser, A., Glindemann, A., GRANI, PAOLO, Hartl, M., Heijmans, J., Henry, D., Huber, H., Kasper, M., Keller, C., Kenworthy, M., Kühn, J., Kuntschner, H., Lightfoot, J., Lunney, D., MacIntosh, M., MANNUCCI, FILIPPO, March, S., Neeser, M., Patapis, P., Pearson, D., Plattner, M., PUGLISI, Alfio Timothy, Quanz, S., Rau, C., RICCARDI, Armando, SALASNICH, Bernardo, Schubert, J., Snik, F., Sturm, E., Valentini, A., Waring, C., Wiezorrek, E., XOMPERO, MARCO   +65 more
openaire   +4 more sources

ALIOLI: Adaptive and Lucky Imaging Optics Lightweight Instrument [PDF]

Adaptive Optics Systems VI, 2018
4 pages, 5 figures ...
Velasco, Sergio, López, Roberto L., Oscoz, Alejandro, Colodro-Conde, Carlos   +3 more
openaire   +2 more sources

Single conjugate adaptive optics for the ELT instrument METIS [PDF]

Experimental Astronomy, 2018
The ELT is a 39m large, ground-based optical and near- to mid-infrared telescope under construction in the Chilean Atacama desert. Operation is planned to start around the middle of the next decade. All first light instruments will come with wavefront sensing devices that allow control of the ELT's intrinsic M4 and M5 wavefront correction units, thus ...
Hippler, Stefan, Feldt, Markus, Bertram, Thomas, Brandner, Wolfgang, Cantalloube, Faustine, Carlomagno, Brunella, Absil, Olivier, Obereder, Andreas, Shatokhina, Iuliia, Stuik, Remko   +9 more
openaire   +5 more sources

Adaptive Optics Challenges for Mid-IR ELT Instrumentation

Adaptive Optics: Analysis and Methods/Computational Optical Sensing and Imaging/Information Photonics/Signal Recovery and Synthesis Topical Meetings on CD-ROM, 2007
Adaptive optics issues particular to a system operating at mid-infrared wavelengths are discussed in the context of MIDIR, the mid-IR instrument for the European ELT. Particular focus is on atmospheric properties at these wavelengths.
Kendrew, S, Stuik, R, Brandl, B, Lenzen, R, Venema, L, Kaeufl, U, Glasse, A   +6 more
openaire   +2 more sources

Image quality with current adaptive optics instruments [PDF]

Astronomy and Astrophysics Supplement Series, 1997
From natural guide star adaptive optics data, we study the properties of the on-axis point spread func- tion and discuss the performance of adaptive optics im- ages. A close relation between the full width half maxi- mum and the Strehl ratio is shown.
openaire   +1 more source

Subaru Telescope —History, active/adaptive optics, instruments, and scientific achievements—

Proceedings of the Japan Academy, Series B, 2021
35 pages, 46 figures, 3 table, soon to be published in the Proceedings of the Japan Academy, Series ...
openaire   +4 more sources

Status of the PALM-3000 high order adaptive optics instrument [PDF]

SPIE Proceedings, 2014
We report on the status of PALM-3000, the second generation adaptive optics instrument for the 5.1 meter Hale telescope at Palomar Observatory. PALM-3000 was released as a facility class instrument in October 2011, and has since been used on the Hale telescope a total of over 250 nights.
Burruss, Rick S., Dekany, Richard G., Roberts, Jennifer E., Shelton, J. Chris, Wallace, J. Kent, Tesch, Jonathan A., Palmer, Dean L., Hale, David, Bartos, Randall, Rykoski, Kevin M., Heffner, Carolyn M., Eriksen, Jamey E., Vescelus, Fred   +12 more
openaire   +2 more sources

Effectiveness of Resistance Intradialytic Exercise Compared to Aerobic Intradialytic Exercise for Patients With Chronic Kidney Disease: A Randomized Controlled Clinical Trial

Therapeutic Apheresis and Dialysis, EarlyView.
ABSTRACT Background Patients with chronic kidney disease undergoing hemodialysis commonly experience reduced physical function, fatigue, poor sleep quality, and impaired health‐related quality of life. Intradialytic exercise has been proposed as a non‐pharmacological strategy to improve these outcomes.
Klebson da Silva Almeida, Gisela Cristiane Miyamoto, Daniel da Costa Torres, Ian Setubal Reis Chaves, Jonas do Carmo Paschoalin, Braúlio Lima Nascimento, Luciana Dias Chiavegato   +6 more
wiley   +1 more source