Zobrazeno 1 - 10
of 484
pro vyhledávání: '"C. Roddier"'
Publikováno v:
Icarus; November 2000, Vol. 148 Issue: 1 p320-320, 1p
Autor:
J. L. Beuzit, M. C. Hainaut, Eduardo L. Martín, Francois Roddier, T. Forveille, Michel Mayor, C. Roddier, C. Perrier, X. Delfosse, D. Segransan, Stéphane Udry
Publikováno v:
Astronomy and Astrophysics-A&A
Astronomy and Astrophysics-A&A, EDP Sciences, 2004, 425, pp.997-1008
Astronomy and Astrophysics-A&A, EDP Sciences, 2004, 425, pp.997-1008
We present some results of a CFHT adaptive optics search for companions to nearby dwarfs. We identify 21 new components in solar neighbourhood systems, of which 13 were found while surveying a volume-limited sample of M dwarfs within 12pc. We are obt
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::623ec65c7e45fecebe3e183572da7f70
https://doi.org/10.1051/0004-6361:20048006
https://doi.org/10.1051/0004-6361:20048006
Publikováno v:
Adaptive Optics.
Summary not available.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0a2bb4adfb151343a802cc94b904820e
https://doi.org/10.1364/adop.1995.wa4
https://doi.org/10.1364/adop.1995.wa4
Autor:
F. Roddier, C. Roddier
Publikováno v:
Publications of the Astronomical Society of the Pacific. 109:815
The detection of faint light sources very close to a bright star is primarily limited by light scattered by the Earth's atmosphere. This source of scattered light can now be reduced by means of adaptive optics, or totally eliminated by using a telesc
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6a649c7c9f707482ac368e6b9bb8813b
https://doi.org/10.1086/133949
https://doi.org/10.1086/133949
Publikováno v:
Optics Communications. 24:281-284
Theoretical transfer functions for astronomical speckle interferometry, through a defocused telescope, have been computed assuming a log-normal complex amplitude for the incoming wavefront. They are found in reasonable agreement with recently publish
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ca56c7de1480c495250cbf8e83d12fad
https://doi.org/10.1016/0030-4018(78)90011-1
https://doi.org/10.1016/0030-4018(78)90011-1
Autor:
C. Roddier, F. Roddier
Publikováno v:
International Astronomical Union Colloquium. 49:175-185
In optical astronomy, images are highly degraded by atmospheric turbulence. The diameter of the seeing disk may vary from 0.2 arcseconds to 10 arcseconds or more according to weather conditions. A typical diameter is of the order of 2 arcseconds whic
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c8863866f9636ec2cd122c514fee2a60
https://doi.org/10.1017/s025292110007487x
https://doi.org/10.1017/s025292110007487x
Publikováno v:
Optica Acta: International Journal of Optics. 26:583-595
Measurements of the energy spectra of infra-red images of stellar point sources were made at the Coude focus of the 3·8 m telescope at Kitt Peak National Observatory, U.S.A. A scanning slit was used to record the irradiance distribution in the image
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::253db5b79c26c9b3b4bbed6cd8132105
https://doi.org/10.1080/713820042
https://doi.org/10.1080/713820042
Autor:
F. Roddier, C. Roddier
Publikováno v:
International Astronomical Union Colloquium. 67:207-211
Compared to speckle-interferometry, amplitude-interferometry has the following advantages: (1) The amplitude of the object Fourier components is insensitive to both turbulence and telescope induced aberrations, permitting an accurate calibration of v
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::df9edaf6e56e726b8a8dbe31effa7d31
https://doi.org/10.1017/s025292110008355x
https://doi.org/10.1017/s025292110008355x
Publikováno v:
Solar Physics. 69:223-231
Fried's seeing parameter r 0 can be determined from the observed r.m.s. contrast of solar granulation. The computation is based on results obtained from solar speckle interferometry. The influence of the telescope diameter on solar observations is sh
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::168cc2f34930e7940347aa33708597ba
https://doi.org/10.1007/bf00149990
https://doi.org/10.1007/bf00149990
Autor:
Alan H. Greenaway, C. Roddier
Publikováno v:
Optics Communications. 32:48-50
Use of a rotating wedge-shaped mirror rather than a rotating prism gives a higher throughput rotation shearing interferometer. The new interferometer has polarization problems if the shear differs from 0° or 180°. However, for the commonly used 180
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1aed6d8aa779047a1ea6418252aa8d40
https://doi.org/10.1016/0030-4018(80)90311-9
https://doi.org/10.1016/0030-4018(80)90311-9