COMMISSION 27 OF THE I.A.U.
                 INFORMATION BULLETIN ON VARIABLE STARS
                             Number 3287

                                                         Konkoly Observatory
                                                         Budapest
                                                         3 February 1989

                                                         HU ISSN 0374 - 0676


                PG 0818+513 - AN ECLIPSING BINARY

Observations on 15 plates taken with the astrograph 400/1600 of Sonneberg
Observatory show that PG 0818+513 is eclipsing with an amplitude of about
1.5 mag. The magnitude estimates are given in Table I.


                Table I

   Magnitude estimates of PG 0818+513

J.D.                   J.D.
2446700+    B          2446700+    B

62.393    14.63m       64.365    14.50m
  .430    14.55          .456    15.68
  .496    14.55          .561    15.02
  .564    14.08        73.403    14.25
63.392    14.98          .450    14.38
  .462    14.80          .469    14.42
  .606    14.94          .603    14.57
                       99.627    14.38

   The magnitudes have been derived using the sequence of Andronov (1986). The
light curve (Figure 1) is based on the preliminary elements

           min = 2446764.460+ 0.577d*E     (?)


                            [FIGURE 1]

     Figure 1   Provisional light curve of PG 0818+513.
     Dots: J.D. 244 6762...64, crosses: J.D. 244 6773


   Because of the sparseness of the data, the length of the orbital period
is still uncertain. If the shoulder near phase 0.75 proves to be real, it
would suggest that the bright spot is more luminous than the accretion
disk, as is the case in objects with small mass accretion rates, that is,
in most of the dwarf novae. But eruptions on PG 0818+513 have neither
been observed on Moscow (Andronov 1986) nor on Sonneberg plates so far.


          GEROLD A. RICHTER

         Sternwarte Sonneberg
    Zentralinstitut fur Astrophysik
          der AdW der DDR



Reference:

Andronov, I.L. 1986, Astron. Tsirk., No. 1418. [BIBCODE 1986ATsir1418....1A ]