The statistics of the photometric accuracy based on MASS data and the evaluation of high-altitude wind |
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Authors: | V G Kornilov |
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Institution: | 1.Sternberg astronomical institute,Moscow,Russia |
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Abstract: | The effect of stellar scintillation on the accuracy of photometric measurements is analyzed. We obtain a convenient form of
estimaton of this effect in the long exposure regime, when the turbulence shift produced by the wind is much larger than the
aperture of the telescope. A simple method is proposed to determine index S
3 introduced by Kenyon et al. (2006), directly from the measurements with the Multi Aperture Scintillation Sensor (MASS) without
information on vertical profile of the wind. The statistics S
3 resulting from our campaign of 2005–2007 at Maidanak observatory is presented. It is shown that these data can be used to
estimate high-altitude winds at pressure level 70–100 mbar. Comparison with the wind speed retrieved from the NCEP/NCAR global
models shows a good agreement. Some prospects for retrieval of the wind speed profile from the MASS measurements are outlined. |
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