2 New photoelectric measurements

The observations were made using the 85 cm reflector installed at the Xinglong Station of Beijing Observatory, China, with a single-channel photometer equipped with an EMI 9863 photomultiplier and controlled by a microcomputer (the photometer is the same as the one installed at the 1.58 m telescope in the Shanghai Observatory, Du Baitian et al. 1993). During the observations, a Johnson V filter was used and the stars SAO 33038, SAO 33050 and SAO 33020 were selected as comparison stars. Within the measuring error of about 5.5 mmag, a good data set which consists of 378 data points covering about 42 hours was obtained. No evidence for any variability of the comparison stars was found. The observing Log is given in Table 1, where the date is in universal time (UT), the time duration is the length of observational run (in days) in each night, point number is the number of independent observations of DQ Cephei. The data are listed in Table 4 which is only available in electronic form at the CDS via http://cdsweb.u-strasbg.fr/Abstract.html

  

Table 1: The observing Log of DQ Cephei from 3 to 8 Oct. 1997