Results 31 to 40 of about 2,141 (221)

Photometry and Spectroscopy of the GRB 970508 Optical Counterpart

Science, 1998
An optical transient within the error box of the gamma ray burst GRB 970508 was imaged 4 hours after the event. It displayed a strong ultraviolet excess, and reached maximum brightness 2 days later. The optical spectra did not show any emission lines, and no variations on time scales of minutes were observed for 1 hour during the decline phase ...
A J, Castro-Tirado, J, Gorosabel, N, Benitez, C, Wolf, R, Fockenbrock, E, Martinez-Gonzalez, H, Kristen, A, Broeils, H, Pedersen, J, Greiner, E, Costa, M, Feroci, L, Piro, F, Frontera, L, Nicastro, E, Palazzi, C, Bartolini, A, Guarnieri, N, Masetti, A, Piccioni, M, Mignoli, M, Wold, M, Lacy, K, Birkle, T, Broadhurst, S, Brandt, N, Lund   +26 more
openaire   +3 more sources

Optical photometry of the UCM Lists I and II [PDF]

Astronomy and Astrophysics Supplement Series, 2000
We present Johnson B CCD photometry for the whole sample of galaxies of the Universidad Complutense de Madrid (UCM) Survey Lists I and II. They constitute a well-defined and complete sample of galaxies in the Local Universe with active star formation. The data refer to 191 SO to Irr galaxies at an averaged redshift of 0.027, and complement the already ...
Pérez González, Pablo Guillermo, Zamorano Calvo, Jaime, Gallego Maestro, Jesús, Gil De Paz, Armando   +3 more
openaire   +3 more sources

MODERNIZATION OF AZT-22 TELESCOPE OF MAIDANAK HIGH-ALTITUDE OBSERVATORY: TESTING RESULTS

Radio Physics and Radio Astronomy, 2014
The AZT-22 telescope, equipped with the ML09000-65 CCD camera, has shown to be capable of obtaining high-quality images of astronomical objects and thus solving a wide range of observational tasks.
A. V. Sergeev, O. A. Burkhonov, V. N. Dudinov, A. P. Zheleznyak, Y. N. Krugly, I. E. Molotov, V. M. Shulga, S. A. Ehgamberdiev, V. V. Konichek, A. E. Kochetov   +9 more
doaj   +1 more source

Evaluation of Uniformity and Glare Improvement with Low Energy Efficiency Losses in Street Lighting LED Luminaires Using Laser-Sintered Polyamide-Based Diffuse Covers

Energies, 2018
Energy saving in street lighting is garnering more interest and has become a priority in municipal management. Therefore, LED luminaires are gradually becoming prevalent in our cities.
Alfonso Gago-Calderón, Manuel Jesús Hermoso-Orzáez, Jose Ramon De Andres-Diaz, Guillermo Redrado-Salvatierra   +3 more
doaj   +1 more source

Measurement of Wavelength-Resolved Light Absorption by Aerosols Utilizing a UV-VIS Extinction Cell

, 2005
The principle, technical details, and performance of the long path extinction spectrometer (LOPES), a new folded-path extinction cell with a spectral range from the mid-UV (200 nm) to the near infrared (1015 nm), is presented.
Schurath, Ulrich, Klein, Karl-Friedrich, Thielmann, Axel, Schurath, U., Möhler, Ottmar, Schmid, O., Gimmler, M., Schmid, Otmar, Fritzsche, L., Andreae, M. O., Petzold, Andreas, Fritzsche, Lutz, Schnaiter, M., Mohler, O. M., Thielmann, A., Helas, Günther, Andreae, Meinrat O., Petzold, A., Helas, G., Schnaiter, Martin, Gimmler, Melanie, Linke, Claudia, Klein, K. F., Linke, C.   +23 more
core   +1 more source

Quantifying the Contamination from nearby Stellar Companions in Gaia DR3 Photometry

The Astronomical Journal
Identifying and removing binary stars from stellar samples is a crucial but complicated task. Regardless of how carefully a sample is selected, some binaries will remain and complicate interpretation of results, especially via flux contamination of ...
Kendall Sullivan, Adam L. Kraus, Travis A. Berger, Daniel Huber   +3 more
doaj   +1 more source

Profiling the turbulent atmosphere and novel correction techniques for imaging and photometry in astronomy [PDF]

, 2010
The turbulent atmosphere has two detrimental effects in astronomy. The phase aberration induced by the turbulence broaden the point spread function (PSF) and limits the resolution for imaging.
OSBORN, JAMES
core  

Optical spectroscopy and photometry of SAX J1808.4−3658 in outburst [PDF]

Monthly Notices of the Royal Astronomical Society, 2009
We present phase resolved optical spectroscopy and photometry of V4580 Sagittarii, the optical counterpart to the accretion powered millisecond pulsar SAX J1808.4-3658, obtained during the 2008 September/October outburst. Doppler tomography of the N III 4640.64 Bowen blend emission line reveals a focused spot of emission at a location consistent with ...
Elebert, P., Reynolds, M. T., Callanan, P. J., Hurley, D. J., Ramsay, G., Lewis, F., Russell, D. M., Nord, B., Kane, S. R., DePoy, D. L., Hakala, P.   +10 more
openaire   +4 more sources

A Surface‐engineered Microfluidic Device for Antibody‐Mediated Negative Selection of High‐Quality Sperm for Assisted Reproduction

Advanced Functional Materials, EarlyView.
This study reports a microfluidic device with a functionalized surface utilizing a polyoxazoline coating and covalently immobilized gold nanoparticles and anti‐phosphatidylserine antibody. The device efficiently eliminates pre‐apoptotic and apoptotic spermatozoa and yields sperm with substantially improved quality and low DNA damage, offering a simple ...
Soraya Rasi Ghaemi, David J. Sharkey, Nicole O. McPherson, Markos Negash Alemie, Krasimir Vasilev, Sarah A. Robertson   +5 more
wiley   +1 more source

Micro-machined membrane deformable mirrors for cryogenic adaptive optics [PDF]

, 2002
In this Thesis, the suitability of 37 actuator Micro-machined membrane deformable mirrors (MMDM) for adaptive optics at cryogenic temperatures is evaluated. A method is described to safely cool MMDMs to 78K. The initial surface figures of three MMDMs are
Dyson, H.M., Dyson, Harold Michael
core