COMMISSION 27 OF THE I. A. U.
            INFORMATION BULLETIN ON VARIABLE STARS
                       Number 2789

                                        Konkoly Observatory
                                        Budapest
                                        10 September 1985

                                        HU ISSN 0374 - 0676




     PHOTOELECTRIC OBSERVATIONS OF THE SYMBIOTIC STAR AG DRACONIS



   This well-known symbiotic star has been observed photographically and
 photoelectrically by several authors. The observations of Meinunger (1979)
 showed periodic variations in the U-magnitude with a period of 554d.

   After a quiet phase till JD 244 4450 two outbursts with amplitudes
 in B of about 1.7 mag and 1.3 mag followed (Luthardt 1983). Since March 1982
 I have been observing AG Dra photoelectrically in U, B and V with the 60 cm
mirror II of Sonneberg Observatory. During this time the star was at first in the


                                  [FIGURE 1]





declining phase following the last outburst. The star reached a low state
in B and V at JD 244 5650, but in U the decline continued till JD 244 5850.
A quiet phase, showing only small variations, followed in B and V, but in
U the brightness increased soon after a short minimum. At JD 244 6100 a new,
but small, outburst began. The amplitude amounted to 0.45 mag in V, 0.70 mag
in B and 1.90 mag in U. Since JD 244 6200 AG Dra has dropped in minimum again.

  It is remarkable that the variations in U correspond with the elements
of Meinunger (1979). Also the maxima of the two last outbursts in V and B
correspond with the calculated maxima for U.





                        R. LUTHARDT

                        Sonneberg Observatory of
                        Central Institute for Astrophysics
                        of Academy of Science of the GDR
                        DDR-6400 Sonneberg




References:
Meinunger L., 1979, IBVS No. 1611
Luthardt, R., 1983, Mitt.Veranderl. Sterne 9, No. 5. 129 [BIBCODE 1983MitVS...9..129L ]