COMMISSION 27 OF THE I. A. U.
           INFORMATION BULLETIN ON VARIABLE STARS
                       Number 2809

                                       Konkoly Observatory
                                       Budapest
                                       15 October 1985

                                       HU ISSN 0374 - 0676



       LIGHT VARIATION OF THE ECLIPSING SYSTEM UV LEONIS


  UV Leonis (BD+15deg2230) is one of the few short period eclipsing systems
which show no complication and whose components are not close to the Roche
limiting surface (McCluskey, 1966). The primary star is slightly larger and
brighter than the secondary component. It is a double lined spectroscopic
binary.
 UV Leonis was first announced as a variable star by Hoffmeister (1934).
Its light curve was classified as an Algol type by Jensch (1935).
 UV Leonis was observed photoelectrically during the last five nights of
March 1985 using the one beam photometer attached to the Cassegrain focus
(f/18) of the 74" telescope at Kottamia Observatory, Egypt 
(latitude N 29deg 55'.9 longitude E 31deg 49'.5). A total of 213 yellow 
and 285 blue magnitudes of UV Leo were obtained. The comparison star observed 
with UV Leonis was BD+ 14deg 2777 and during the observations the nights were 
of good photometric quality.


                                [FIGURE 1]
                                [FIGURE 2]



The light curves obtained in yellow and blue colours are shown in Figures
1 and 2 respectively. It is clearly seen that the system has two nearly equal
minima.
 Four times of minima, two primary and two secondary in both B and V colours
were obtained. The residuals were calculated using the following ephemeris:

       Hel.Min. I = 2438440.7275 + 0.6000855d E

The times of minima are given in Table I.

                      Table I

Hel.Min.JD.    Min.   Filter    E          O-C

2446152.4263      I   B         12851      0.0000
       .4258          V                   -0.0004
2446153.3263     II   B         12852.5   -0.0001
       .3267          V                   +0.0003
2446155.4264      I   B         12856     -0.0003
       .4269          V                   +0.0002
2446156.3268     II   B         12857.5   +0.0001
       .3268          V                    0.0000



                    M.A. SOLIMAN, M.A. HAMDY, H.A. MAHDY
                    Helwan Observatory, Egypt

 References:
Hoffmeister,C., 1934, Astron.Nachr. 253, 195. [BIBCODE 1934AN....253..195H ]
Jensch,A., 1935, Astron.Nachr. 257, 139. [BIBCODE 1935AN....257..139J ]
McCluskey,G.E., 1966, Astron.J. vol. 71, No. 6., 536. [BIBCODE 1966AJ.....71..536M ]