Abstract
If a variable star is observed with a photoelectric photometer during the whole night or at least for several hours both east and west from the meridian, the measurements of the brightness of the comparison star may yield useful information about the atmospheric extinction and about the performance of the photoelectric equipment as well. The extinction coefficients are valuable for the reduction of the data concerning the variable star itself and also for the study of the variation of atmospheric extinction at the observatory site. One of the most annoying characteristics of the photometric device is the zero-point drift during the night as a consequence of the change of the sensitivity of the photometer.The influence of the zero-point drift and the changes of extinction during the night on the Bouguer line (observed magnitude against air mass) was studied separately in a previous paper (Kviz, 1978, hereafter referred to as Paper I). In the present paper the simultaneous effects of both the zero-point drift and the changes of the extinction on the Bouguer plots are investigated.
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