Zobrazeno 1 - 10
of 42
pro vyhledávání: '"Claude Roddier"'
Autor:
Laird M. Close, J. E. Graves, Malcolm J. Northcott, Francois Roddier, Claude Roddier, D. Potter
Publikováno v:
The Astrophysical Journal. 540:422-428
We have obtained J-band (1.2 ?m) polarimetry observations of the circumbinary disk around UY Aurigae. These observations were made possible by the use of the University of Hawaii 36 element adaptive optics instrument, Hokupa'a, at the 3.35 m CFHT. Th
Autor:
T. C. Owen, André Brahic, Francois Roddier, J. E. Graves, Malcolm J. Northcott, Claude Roddier, Christophe Dumas
Publikováno v:
Icarus. 143:299-307
Adaptive optics (0.15″ resolution) infrared images of the rings and satellites of Saturn were obtained in August 1995 as the Earth was crossing the ring plane. Twelve clumps were detected in the F ring, including HST S5 and S7 objects. For the firs
Autor:
C. Espejo, J. Elon Graves, G. F. Bisiacchi, Andrea Aparicio Martinez, Salvador Cuevas, Olivier Guyon, Valeri Vuntesmeri, Claude Roddier, Salustio Gonzalez, Francois Roddier
Publikováno v:
Publications of the Astronomical Society of the Pacific. 111:1322-1331
The nulling coronagraph, first proposed by Roddier and Roddier, uses a small mask (less than half the size of the central Airy spot) that shifts the phase of the incoming light by 180° to strongly attenuate the Airy spot as well as the rings. We rep
Publikováno v:
Icarus. 136:168-172
Since August 1995, near-infrared images of Neptune have regularly been obtained with the University-of-Hawaii telescope. These images reveal Neptune's cloud structure with an angular resolution reaching 0.12″ in the H band.
Publikováno v:
Icarus. 136:50-59
High angular resolution (adaptive optics) images taken on August 12, 1995 between 11:26 and 12:23 (UT) show a faint elongated structure apparently moving away from Saturn. The structure is consistent with light scattered by an arc of particles on a K
Autor:
Malcolm J. Northcott, J. E. Graves, Francois Menard, Anne Dutrey, Gilles Duvert, Stéphane Guilloteau, Claude Roddier, Laird M. Close, D. Potter, Francois Roddier
Publikováno v:
The Astrophysical Journal. 499:883-888
We have obtained high-resolution (FWHM = 015) deep images of the UY Aur binary at J, H, and K' with the University of Hawaii adaptive optics instrument. We clearly detect an R ~ 500 AU circumbinary disk discovered with millimeter interferometry, maki
Autor:
J. E. Graves, Laird M. Close, Giovanni G. Fazio, Claude Roddier, Joseph L. Hora, A. Dayal, Francois Roddier, Lynne K. Deutsch, Malcolm J. Northcott, W. F. Hoffman
Publikováno v:
The Astrophysical Journal. 489:210-221
We present high-resolution (FWHM = 02) near-IR (J, H, and K') adaptive optics images of the Herbig Ae/Be star R Monocerotis. Optical Hubble Space Telescope (HST) WFPC2 PC camera archival images are also presented. For the first time, adaptive optics
Autor:
Malcolm J. Northcott, André Brahic, Tobias Owen, Claude Roddier, J. E. Graves, Francois Roddier, C. Dumas
Publikováno v:
Planetary and Space Science. 45:1031-1036
High angular resolution (0.15″) K-band images of Neptune were obtained in August 1995, with the University-of-Hawaii adaptive optics system mounted on the 3.6m Canada-France-Hawaii telescope. The images show bright high contrast features that are b
Autor:
Claude Roddier
Publikováno v:
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy. 325:109-114
Resume Malgre les sondes spatiales, l'observation depuis la Terre d'objets du systeme solaire a encore un grand interet, grâce au telescope spatial mais surtout a l'optique adaptative. Nous le montrons ici sur un exemple: l'observation de Saturne lo
Autor:
Francois Roddier, Claude Roddier
Publikováno v:
Applied optics. 32(16)
Stellar images taken by the Hubble Space Telescope at various focus positions have been analyzed to estimate wave-front distortion. Rather than using a single algorithm, we found that better results were obtained by combining the advantages of variou