COMMISSION 27 OF THE I. A. U.
       INFORMATION BULLETIN ON VARIABLE STARS
                   Number 2831

                                Konkoly Observatory
                                Budapest
                                9 December 1985

                                HU ISSN 0374 - 0676



           1984 UBVR LIGHT CURVES OF ER Vul



   The star ER Vul (SAO 089396) was discovered as a
spectroscopic binary by Northcott and Bakos (1956), and
included in the Hall (1976) list of short period RS CVn
stars.

   The system ER Vul was observed during 8 nights, on
the 13th and from the 22nd to the 27th of August 1984,
from the Observatorio del Roque de Los Muchachos at La
Palma (Canary Islands), using the People's Photometer,
a two channel photoelectric photometer and UBVR filters
of Cousins system, (1976), at the Cassegrain focus of
the 1m JK Telescope.

   The stars SAO 089378 and SAO 089381 were used as
comparisons. The results are given in  Figures 1, 2, 3
and 4 where the differential magnitude is plotted against
the phase, calculated using the ephemerides of Al-Naimiy
(1981).


          HJD = 2440182.3212 + 0.698082d*E
                       +- 8       +- 2


   The curves show irregularities which have already
been commented in previous studies, Northcott and Bakos
(1967), Al-Naimiy (1981), Kadouri (1981), Hrivnak (1982)
and Zeilik et al. (1982).                             


                      [FIGURE 1]
                      [FIGURE 2]


                      [FIGURE 3]
                      [FIGURE 4]



   We agree with Zeilik et al. (1982) in the assumption
that there is higher dispersion of the measurements outside 
the eclipses than during these. Second, the shoulder
at phase 0.25 is still depressed and more symmetrical than
that at 0.75, as well as variations shorter than one week.
A more detailed study of these curves is being prepared
for publication.




                M. J. AREVALO and    J. J. FUENSALIDA

               Instituto de Astrofisica de Canarias,
               38071 La Laguna,
               Tenerife,
               Spain

References:

Al-Naimiy, H.M.: 1981, Astron. Astrophys. Suppl. Ser.
  43, 85-90. [BIBCODE 1981A&AS...43...85A ]
Cousins, A.W.J.: 1976, Mem. Roy. Astron. Soc. 81, 25. [BIBCODE 1976MmRAS..81...25C ]
Hall, D.S.: 1976, Proc. of IAU Coll. No. 29 (Budapest)
  Part 1, 287. [BIBCODE 1967AJ.....72...89N ]
Hrivnak, B.J.: 1982, 159th meeting of the American Astronomical 
  Society, Boulder, Colorado.
Kadouri, T.H.: 1981, IBVS No. 2057.
Northcott, R.J., and Bakos, G.A.: 1956, Astron. J. 61, 188. [BIBCODE 1956AJ.....61..188N ]
Northcott, R.J., and Bakos, G.A.: 1957, Astron. J. 72, 89. [BIBCODE 1967AJ.....72...89N ]
Zeilik et al.: 1982, IBVS No. 2107.
Zeilik et al.: 1982, IBVS No. 2221.