COMMISSION 27 OF THE I. A. U.
          INFORMATION BULLETIN ON VARIABLE STARS
                      Number 3053

                                        Konkoly Observatory
                                        Budapest
                                        28 July 1987

                                        HU ISSN 0374-0676


            B, V, R, I OBSERVATIONS OF CE LEONIS

   The very short period eclipsing binary system CE Leo (S 7763) was
discovered by Hoffmeister (1963). Finder charts are included in his
paper. Meinunger and Wenzel (1968) give 21 visual times of minimum
light as well as visual light curve. Other visual epochs of minimum
light appear in BBSAG Bulletins No. 9, 14, 15, 21 and 37. Two photoelectric 
epochs of minimum light have been determined by Hoffman (1983).
   The present observations were made on the nights of January 31 and
February 1, 1987. The 0.9m #2 reflector at Kitt Peak National
Observatory was used with a photometer which housed standard B,V,R,I
filters in the Cousins system (Bessell, 1976) and a dry-ice-cooled RCA
31034a Ga-As photomultiplier tube. The positions of the check,
comparison and variable stars are given in Table I. Neither the check
nor the comparison star has a known catalogue identification.
Approximately 200 observations were made at each effective wavelength in
the phase interval 0.6 - 0.1. The B, V, R, I observations of CE Leo
defined by the individual observations are shown in Figure 1 as Delta m
versus phase.

                   Table I

           STAR  	R.A. (1950)     Dec. (1950)

	   CE Leo  	11h41m27s  	23d37'
           Comparison 	11 41 10       	23 34
	   Check   	11 41 05  	23 39


                          [FIGURE 1]

 Fig. 1 - Light curves of CE Leo defined by individual observations.

   Times of minimum light were determined in all four colors from the
observation of one primary eclipse. An iterative technique based on the
Hertzsprung method (1928) was utilized. The mean of these four times
(p.e.= +/-0.0002) is listed in Table II along with Hoffman's (1983) data.


                         Table II

        Photoelectric Epochs of Minimum Light, CE Leo

        JD Hel.
        2440000+       Cycles      (O-C)     Source

        5044.5495     -5877.5     -0.0002    Hoffman

        5047.4325     -5868.0      0.0002    Hoffman

        6828.0131         0.0     -0.0000    Samec

   The ephemeris published by Meinunger and Wenzel (1968, MVS 1966),
is JD Hel. Min I = 2437651.650 + 0.3034286dE. Since this set of light
elements does not satisfactorily represent the present data, a new
ephemeris was calculated. Using the period from the ephemeris given by
Meinunger and Wenzel and the epoch determined from the present observations, 
the three available photoelectric times of minimum light were
introduced into a least squares solution. The resulting ephemeris,

   JD Hel Min. I = 2446828.0131 + 0.30343912dE

was employed in calculating the O-C's in Table II and the phases of the
present observations.

   Additional photoelectric data are needed to improve this ephemeris.



                                    *
                     RONALD G. SAMEC

                     BEVERLY B. BOOKMYER
                     Dept. of Physics 6 Astronomy
                     Clemson University
                     Clemson, SC 29634-1911 USA



   *
    Visiting Astronomer, Kitt Peak National Observatory, National
Optical Astronomy Observatories operated by AURA, Inc. under contract
with the National Science Foundation.


References:

Bessell, M.S. 1976, Pub. Astron. Soc. Pac. 88, 557. [BIBCODE 1976PASP...88..557B ]
BBSAG Bull. 1973, No. 9.
BBSAG Bull. 1974, Nos. 14 and 15.
BBSAG Bull. 1975, No 21.
BBSAG Bull. 1978, No. 37.
MVS 1966, No. 4(2), 19.
Hertzsprung, E. 1928, Bull. Astron. Inst. Neth. 4, 179. [BIBCODE 1928BAN.....4..178H ]
Hoffman, M. 1983, Inf. Bull. Var. Stars, No. 2344.
Hoffmeister, C. 1963, AN 287, 169. [BIBCODE 1963AN....287..169H ]
Meinunger, L. and Wenzel, W. 1968, VSS 7(4), 393 and 430.