IAU COMMISSION 27 UNPUBLISHED DATA FILE 272E 4 pages including cover sheet June, 1993 PHOTOELECTRIC MEASUREMENTSOF THE {delte} SCUTI STAR EP Cnc During 1989 February 7 through 26, a multisite campaign of HD 73819 = EP Cnc = KW 348 in the Praesepe cluster was carried out at five observatories on three continents. The photoelectric observations were obtained through V or y filters. The following telescopes were used _ the 0.6 meter telescope of Sierra Nevada Observatory (observer R. Garrido), - the 0.5 meter telescope at the Devon Astronomical Observatory, Canada (observers B. Martin and D.P. Hube), - the 0.6 meter telescope at the Xing-Long station of the Beijing Observatory, China - the 0.6 meter Morgan telescope at Lowell Observatory, USA (observer W.M. Osterman) - the 1.0 meter RCC telescope of Piszkesteto, the mountain station of Konkoly Observatory, Hungary (observer M. Paparo) The comparison star used was KW 276 = HD 73711 (Am), for which variability was found. The constancy was confirmed since a third star, BU Cnc, was also observed. This made possible the inspection of the three power spectra of the magnitude differences. In the millimag range different photometer/filter combinations lead to different zero-points, even if the same comparison stars are used. This fact needs to be considered when different data sets are joined together. Consequently, for each photometer the photometric zero-point of EP Cncc was ajusted to produced the best agreement with the data from the other telescopes. The new observations are shown on the next three pages. M. Breger Institut fuer Astronomie University of Vienna Tuerkenschanzstrasse 17 A-1180 Wien Austria ******************************************************************************* HJD DELTA V 244 7500+ (mag) 65.7913000 1.6040000 65.7995000 3.3920000 65.8103000 -1.1680000 65.8219000 1.9650000 65.8320000 -1.1910000 65.8431000 -3.9680000 65.8713000 -4.6580000 65.8898000 -.5050000 65.9009000 -1.3580000 65.9119000 .2570000 65.9211000 2.5530000 66.6066000 1.8570000 66.6139500 2.7070000 66.6209000 .8570000 66.6288000 .8070000 66.6389000 .8740000 66.6495330 -.2930000 66.6601000 .2400000 67.0072020 -2.2940000 67.0184330 1.5500000 67.0303040 3.6730000 67.0385740 1.2010000 67.0458990 3.0490000 67.0655720 3.2440000 67.0754600 .1830000 67.0854290 .9280000 67.0965370 -.7970000 67.7321000 .3270000 67.7388000 .2070000 67.7452000 .3980000 67.7519000 1.3250000 67.7581000 1.3920000 67.7652000 2.7810000 67.7708000 2.8740000 67.7804000 3.3250000 67.7905000 6.3670000 67.7979000 5.1840000 67.8038000 4.9660000 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