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Дата изменения: Tue Feb 8 09:57:26 2000
Дата индексирования: Sat Sep 11 20:33:19 2010
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Reduction of the Calar Alto 2.2m telescope data

This reduction was fully done at SAO with the standard reduction system MIDAS (Munich Image Data Analysis System, Grosbøl [1989]). We applied the context LONG as follows: bias and dark subtraction, flat-fielding, cosmic-ray removal. After the wavelength mapping, a night sky 2-D background subtraction was performed. 1-D spectra were extracted by adding the consecutive CCD rows centered on the object intensity peak along the slit. Then the corrections for atmospheric extinction and flux calibration were applied. Despite of the non-photometric observing conditions, we corrected the spectra for the instrumental response with a response curve established by observations of the spectrophotometric standard star BD+33$^{\circ}$ 2642