COMMISSION 27 OF THE I. A. U.
        INFORMATION BULLETIN ON VARIABLE STARS
                     NUMBER 332

                               Konkoly Observatory
                               Budapest
                               1969 February 19

        PHOTOELECTRIC OBSERVATIONS OF YZ CMi

      The data obtained at Catania Observatory during the
January, 1969 international patrol of the flare star YZ CMi
are reported.
      Our photoelectric observations were carried out
with a 91 cm cassegrain and a 61 cm quasi-cassegrain telescopes
both equipped with EMI 6256 S photomultiplier-tubes.
These devices were working in B (lambda_eq = 4300 A) and
V (lambda_eq = 5150) lights respectively.
      The data given in the Tables I and II agree with
those preliminarily suggested by the "Working group on UV
Cet-type stars" (Chugainov, 1968).

                      [FIGURE 1]

      During the observing period January 11-25, we were
able to observe for 19,55 hours and we did not observe any
flare. The flare, the characteristics of which are reported
in Table II was observed two nights before the beginning of
the planned international patrol. The light curve of the
flare is drawn in Fig. 1.


Catania Astrophysical Observatory            S. CRISTALDI
February 10, 1969                            M. NARBONE
                                             M. RODONO

Reference
Chugainov P.F. 1968 Private communication.


                                 Table I

M, N             Detailed Coverage                              TC     Delta_m_lim    CTC
Jan.
09-10   91   B   20h48m-20h52m,2056-0212,0214-0323,0325-0339.   6h72      -0m04       6h72
13-14   91   B   1918-1920,1922-1949,2033-2056,2058-2205,
                 2207-2212,0133-0147.                           2.25        .05
        61   V   2100-2118,2120-2150,2153-2158,2200-2207,
                 0200-0203,0205-0224.                           1.37        .06       2.65
18-19   91   B   2311-2314,2316-2320.                           0.12        .04
        61   V   2224-2230,2234-2319.                           0.85        .06       0.87
20-21   91   B   1938-2002,2004-2008,2008-2140,2338-0012,
                 0016-0121,0123-0134.                           3.90        .06
             V   1948-1958,2000-2026,2028-2050,2053-2112,
                 2115-2127,2130-2136,2341-0010,0022-0051,
                 0053-0105,0107-0125,0127-0128.                 3.10        .05       4.00
21-22   91   B   1834-1838,1920-1946,1949-1955,1957-2013,
                 2015-2019,2022-2049,2118-2130,2150-2223,
                 2237-2303,2305-2307,2309-0000,0003-0010,
                 0035-0045.                                     3.73        .06
        61   V   2034-2100,2102-2142,2145-2211,2217-2259,
                 2258-2312,2314-0022,0024-0042.                 3.85        .04       5.20
22-23   91   B   1858-1925,1939-2033,2038-2213,2215-2221,
                 2223-2227,2230-2258,2258-2319,2323-0054,
                 0058-0149,0152-0219,0221-0228,0230-0253,
                 0255-0304.                                     6.47       .05
        61   V   1920-1927,1930-2016,2021-2034,2037-2058,
                 2139-2202,2223-2249,2303-2306,2341-0041,
                 0109-0115,0118-0128,0130-0157,0159-0202,
                 0205-0225,0228-0252,0257-0308.                 4.97       .03        6.85


                  Table II Observed Flare

Jan 9/10 CTC 6h72, L:B, beginning 21h06.6m U.T., t_max 21h07.2m, end 21h10.8m,
Delta_m_lim: -0.04m [(I_0+F-I_0/I_0]max : 0.33, Integrated intensity 0.22 min.