IAU COMMISSION 27 UNPUBLISHED DATA FILE 223 6 pages, including cover sheet - August, 1990 Further photoelectric observations of the Delta Scuti variable 4 CVn. This file includes photoelectric V measurements made during 1976, 1977 and 1978 at McDonald Observatory by G. Loumos. The measurements listed are relative measurements: discussions can be found in a paper, accepted for publication by Astronomy and Astrophysics, with the title 'Amplitude Variations of the Multimode Nonradial Pulsator 4 Canum Venaticorum'. Further observational details can be found in the dissertation by G. Loumos (Univ. of Texas at Austin, 1980). Michel Breger Institut fuer Astronomie Tuerkenschanzstrasse 17 A-1180 Wien Austria ******************************************************************************* HJD (days) dV 244 0000+ (mag) 2794.9512 -0.004 2794.9556 0.001 2794.9607 0.003 2794.9653 0.005 2794.9700 0.008 2794.9741 0.011 2794.9788 0.011 2794.9844 0.012 2794.9890 0.011 2794.9934 0.010 2794.9983 0.008 2795.0027 0.009 2795.0073 0.005 2795.0120 0.001 2795.0173 -0.002 2795.0215 -0.004 2795.0259 -0.008 2795.0300 -0.012 2795.0344 -0.014 2795.0386 -0.018 2868.7046 -0.008 2868.7139 -0.003 2868.7217 0.003 2868.7290 0.008 2868.7354 0.011 2868.7546 0.015 2868.7610 0.014 2868.7668 0.008 2868.7744 0.000 2868.7798 -0.006 2868.7856 -0.009 2868.7913 -0.015 2868.7981 -0.018 2868.8044 -0.019 2868.8103 -0.019 2868.8340 -0.005 2868.8398 -0.001 2868.8457 0.008 2868.8513 0.014 2868.8574 0.018 2868.8630 0.025 2868.8694 0.025 2868.8755 0.025 2868.8816 0.020 2868.8882 0.012 2868.8945 0.005 2868.9006 -0.004 2868.9072 -0.017 2868.9133 -0.018 2868.9192 -0.022 2868.9253 -0.028 2868.9316 -0.025 2868.9375 -0.026 2868.9434 -0.017 2868.9497 -0.011 2868.9558 -0.005 2869.7075 0.005 2869.7136 0.001 2869.7192 -0.001 2869.7251 -0.007 2869.7305 -0.006 2869.7356 -0.011 2869.7410 -0.013 2869.7556 -0.010 2869.7603 -0.009 2869.7649 -0.004 2869.7698 0.000 2869.7744 0.005 2869.7788 0.007 2869.7837 0.010 2869.7883 0.011 2869.7937 0.014 2869.7993 0.014 2869.8044 0.016 2869.8101 0.014 2869.8147 0.013 2869.8198 0.012 2869.8247 0.009 2869.8335 0.004 2869.8386 0.000 2869.8435 -0.003 2869.8484 -0.006 2869.8535 -0.009 2869.8584 -0.011 2869.8645 -0.011 2869.8694 -0.012 2869.8745 -0.012 2869.8884 -0.004 2869.8933 -0.001 2869.8989 0.003 2869.9041 0.005 2869.9092 0.005 2869.9143 0.008 2869.9194 0.003 2869.9248 0.002 2869.9299 0.000 2869.9353 -0.001 2869.9404 -0.007 2869.9458 -0.005 2869.9512 -0.004 2871.7080 -0.002 2871.7126 -0.004 2871.7175 -0.002 2871.7222 -0.003 2871.7271 -0.002 2871.7322 0.002 2871.7429 0.007 2871.7480 0.009 2871.7534 0.012 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