Quantifying man-made seeing at the Nordic Optical Telescope

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

We present preliminary data that have enabled us to quantify local seeing effects at the Nordic Optical Telescope. The basic data are sets of time sequences of out-of-focus stellar images and simultaneously recorded values for the wind speed and direction, altitude and azimuth of the telescope, status of the dome hatches and various relevant temperature differences. The method consists in computing the correlation function for linearly increasing time spans within each time sequence of images. Typically 350 images were recorded over a 41-s period, allowing us to find correlation coefficients for a wide range of time scales. The essence of the method is to set the exposure time for each image to such a value (40-ms) that most of the fast atmospheric scintillation is averaged out, while the slower local turbulence is recorded. By studying the correlation coherence times, some idea can be obtained of the local or man-made seeing effects present. We use our data to improve the heat management and ventilation in the dome, thereby attempting to reduce the man-made seeing that deteriorates the image quality obtained by the detectors.

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