COMMISSION 27 OF THE I. A. U. INFORMATION BULLETIN ON VARIABLE STARS NUMBER 684 Konkoly Observatory Budapest 1972 June 20 PHOTOELECTRIC OBSERVATIONS OF YZ CMi According to the proposition of the "working group" (IBVS 605) photoelectric monitoring of the star YZ CMi was carried out in the time interval 9-23 January 1972. The observations were effectuated on the 40 cm reflector of the Byurakan Observatory with a FJY - 79 photomultiplier and a corresponding B filter. The pulse counting technique with continuous registration on the recorder chart was applied. The observational data (IBVS 488) are presented in the Table. Date Coverage UT_max t_b t_a X_fM sigma P F(z) Notes UT UT ---- ----- _ _ X_s X_s 18-I 1700-1744 0.031 1747-1800 0.031 1902-2140 0.031 2240-2400 23h26.5m 0.3 0.6 0.41 0.031 0.15 1.56 1 23 27.5 0.2 0.9 0.19 0.031 0.08 1.56 1 19-I 1715-1800 0.035 1848-1930 0.035 1940-2033 0.035 2041-2141 0.035 2147-2224 0.035 2241-2400 0.035 20-I 1716-1815 0.061 2 1840-1930 o.061 2 1935-2030 0.061 2 2036-2154 0.061 2 2156-2229 0.061 2 2231-2300 0.061 2 2330-2400 23 57.7 0.45 0.35 0.36 0.061 0.11 1.80 1,2 23 58.5 0.60 0.45 0.39 0.061 0.21 1.80 1,2 23 59.7 0.25 0.80 1.10 0.061 0.21 1.80 1,2 21-I 0000-0010 00 01.1 0.3 0.2 0.20 0.061 0.05 1.80 1,2 23-I 1859-2100 0.044 3 2102-2400 0.040 Total coverage 1282 minutes. Notes: 1.-Flare of a complex structure. The division on several flares is done according to the criteria accepted in the reference (1). 2.-Very poor weather conditions. 3.-Until UT 21h20m poor weather conditions. The light curves of observed flares are presented in the figures. The ordinate is given in the units of Xf/Xs. V.S. OSKANIAN and J.V. KHATCHATRIAN Byurakan Observatory Armenia, USSR. Reference 1.-Oskanian V. and Terebizh V. 1971, Astrofizika vol. 7, No. 1, pg 83. [BIBCODE 1971Afz.....7...83O ] [FIGURE 1]