Results 111 to 120 of about 168,541 (274)

Observational Speckle Interferometry [PDF]

International Astronomical Union Colloquium, 1979
AbstractSpeckle interferometry techniques have improved appreciably during the past few years. Current progress to be reviewed includes: steps towards a fully digital analysis in the photon counting mode allowing for high resolution on faint astrophysical objects (i.e.
openaire   +1 more source

Speckle Interferometry in Astrometry [PDF]

Symposium - International Astronomical Union, 1986
Speckle interferometry, which is characterised by diffraction limited resolution and enhanced accuracy, offers a wide range of possibilities for astrometry. Speckle applications are limited by the constraint of isoplanicity with the result that only differential rather than absolute astrometry can be carried out with the technique.
openaire   +1 more source

Desenvolvimento de uma roseta óptica difrativa para medição de deslocamentos, deformações, tensões mecânicas e tensões residuais mecânicas [PDF]

, 2012
Tese (doutorado) - Universidade Federal de Santa Catarina, Centro Tecnológico, Programa de Pós-Graduação em Engenharia Mecânica, Florianópolis, 2010Este trabalho dá continuidade à linha de pesquisa em métodos ópticos de medição do Labmetro/UFSC, que ...
Kapp, Walter Antonio
core  

Automated Speckle Interferometry of Known Binaries

, 2023
Astronomers have been measuring the separations and position angles between the two components of binary stars since William Herschel began his observations in 1781.
Hardy, Nick, Davis, Marie, Wholly, Roger, H., Sithara Naskath, Snyder, Ronald, A, Mariam Ronald Rabin, Inbanathan, S. Stephen Rajkumar, Genet, Russell, Freed, Rachel, Rowe, David, Wasson, Rick, Carter, Julia, Smith, Tom, Calvin, Maaike, Bewersdorff, Leon, R., Shane Christopher, Cotton, Sumner, Harris, Mark, Armstrong, James, Giavarini, Christopher, Dixon, Scott, Terrazas, Mario, A., Arun Kumar, McCudden, Paul   +23 more
core  

High-resolution Imaging of a TESS Control Sample: Verifying a Deficit of Close-in Stellar Companions to Exoplanet Host Stars

The Astronomical Journal
The large number of exoplanets discovered with the Transiting Exoplanet Survey Satellite (TESS) means that any observational biases from TESS could influence the derived stellar multiplicity statistics of exoplanet host stars. To investigate this problem,
Colin Littlefield, Steve B. Howell, David R. Ciardi, Kathryn V. Lester, Mark E. Everett, Elise Furlan, Rachel A. Matson, Sergio B. Fajardo-Acosta, Crystal L. Gnilka   +8 more
doaj   +1 more source

Double pulse-electronic speckle interferometry [PDF]

, 2012
The double-pulsed speckle interferometry method is very much simpler than the double pulse holographic interferometry and allows a quick analysis of the interferograms without the development of films and hologram reconstructions.
Pedrini, Giancarlo, Tiziani, Hans J.
core   +1 more source

A hybrid technique for residual stress analysis through stress function fitting

Latin American Journal of Solids and Structures
This work presents a hybrid experimental theoretical technique for residual stresses analysis of mechanical components. It was used the blind hole technique along with the Electronic Speckle Pattern Interferometry (ESPI) method and Airy stress functions ...
Marco Antonio Martins Cavaco
doaj   +1 more source

Studies in speckle interferometry [PDF]

, 1982
Initial studies were undertaken concerning laser speckle photography (sometimes called single-beam speckle interferometry) to obtain information about the technique and determine methods to enable specklegrams of high contrast and definition to be produced.
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Unreported ICCD Speckle Interferometry Measures of Double Stars

The Astronomical Journal
We report here on 1057 speckle interferometric double star measures obtained between 1997 and 2018 by the Center for High Angular Resolution Astronomy group at Georgia State University and the Double Star Group at the U.S. Naval Observatory.
Brian D. Mason, William I. Hartkopf
doaj   +1 more source

Speckle Interferometry at SOAR in 2024 and 2025

The Astronomical Journal
Results of speckle interferometry observations at the 4.1 m Southern Astrophysical Research telescope obtained during 2024–2025 are presented. We present 5316 measurements of relative positions and magnitude differences in 3532 pairs (including 524 ...
Andrei Tokovinin, Brian D. Mason, Rene A. Mendez, Edgardo Costa   +3 more
doaj   +1 more source