COMMISSION 27 OF THE I. A. U.
        INFORMATION BULLETIN ON VARIABLE STARS
                    Number 1538

                                 Konkoly Observatory
                                 Budapest
                                 1979 January 29



         PHOTOELECTRIC PHOTOMETRY OF UZ LEONIS


   The W Ursae Majoris system, UZ Leo, was observed photoelectrically 
in 1975. The 24-inch Morehead telescope of the University
of North Carolina (Chapel Hill) was equipped with an uncooled
photomultiplier tube and a DC amplifier. An RCA 1P21 tube was
used on seven nights and an EMI 9789 on two nights. A one minute
deflection was defined as a single observation. The BD numbers
and coordinates of UZ Leo, comparison and check star are given
below:

Star           BD No.   R.A.(1900)   Dec.(1900)
-------------------------------------------------
UZ Leonis     +14d2280   10h35m14s      +14d05.3'
Comparison    +14 2284   10 36 37       +14 18.3
Check         +14 2275   10 33 06       +14 29.7
-------------------------------------------------

   Standard stars were observed so that all observations could
be converted to the UBV system. Differential extinction corrections 
were also included. The comparison star was found to have
the following values:

    V = 8.95 +- .03 p.e.
(B-V) = 0.29 +- .01
(U-B) = 0.04 +- .03

The B and V observations of UZ Leo appear plotted in Figure 1.
The phases were computed from the light elements of Binnendijk
(1972). UZ Leo was found to have the following magnitudes and
color.


Maximum               Secondary Minimum
--------------------------------------------
  V = 9.58 +- .04 p.e.     10.12 +- .05 p.e.
  B = 9.91 +- .04          10.43 +- .05
B-V = 0.33 +- .01           0.32 +- .02
--------------------------------------------

                        [FIGURE 1]

   The bottom of primary minimum was poorly covered by the
present observations, but it is approximately 0.03m deeper than
the secondary minimum. The amplitude of the light variations
agrees very closely with that found by Binnendijk.




                          RONALD H. KAITCHUCK
                          Department of Astronomy
                          Indiana University
                          Bloomington, Indiana 47405




Reference:

Binnendijk, L. 1972, Astron. J. 77, 246 [BIBCODE 1972AJ.....77..246B ]