Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja......371k&link_type=abstract
EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #371
Astronomy and Astrophysics
Astronomy
Scientific paper
The ESO Very Large Telescope Interferometer (VLTI) in Chile is one of the most modern and powerful astronomical facilities, with a capability to measure details of stellar sources on scales of the order of one millisecond of arc. The operation of astronomical interferometers is strongly dependent on atmospheric conditions. In particular, the transfer function of VLTI strongly depends on such atmospheric parameters, as seeing, coherence length and coherence time. We have addressed the question of whether a correlation exists between local seeing, and the scintillation of the stellar images. The photometric data used for this project were obtained with the test VLTI instrument VINCI, both in the case of small 40cm siderostats, and in the case of two large 8m mirrors separated by about 105 m. We have developed programs to calculate the average strength of relative intensity fluctuations, power spectra and polynomial approximation to seeing from scintillation. The programs were applied to direct photometric data recorded along with the interferometric signal, and the astronomical seeing was computed for each night. A comparison between the seeing with the intensity variance suggested a correlation, such that moments of good seeing correlated with moments of high intensity variance, while periods of poor seeing were accompanied by low variance. It is possible to conclude that seeing can be predicted from scintillation at least at a first approximation. This work will be used to improve the knowledge of the transfer function of the VLTI.
Khristoforova M.
Richichi Andrea
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