COMMISSION 27 OF THE I. A. U.
                    INFORMATION BULLETIN ON VARIABLE STARS
                                 Number 2466



                                                        Konkoly Observatory
                                                        Budapest
                                                        30 January 1984

                                                        HU ISSN 0374-0676

                  WEAKENING OF Hbeta EMISSION OF PU Vul   	            



  The peculiar nova-like variable PU Vul was observed on August 29 and
September 1, 1983 using the grating spectrograph attached to the 60/90-cm
Schmidt telescope of Peking Observatory, and in October of Yunnan Observatory.
The Hbeta appeared in emission on September 1 and was seen to be much enhanced
in October, 1983 (Liu Zongli, Hao Xiangliang, I.B.V.S. No. 2446, 1983).
  We observed the same star again with the above mentioned instruments in
November, 1983 at Yunnan Observatory and in December at Peking Observatory.
Four plates were obtained altogether. The Hbeta emission became very faint.
The trace of Hbeta emission could still be seen on November 3 and 6, 1983. But
one could hardly find it on November 4 and December 11, 1983. The Hbeta emission
also seemed to weaken.
  The tracings of the spectra obtained on October 10 and November 4, 1983
are presented in Figure 1.





               LIU ZONGLI and HAO XIANGLIANG
               Peking Astronomical Observatory
               Academia Sinica



                           [FIGURE 1a]

           Figure 1a   Tracing of spectrum on 10 October 1983

                           [FIGURE 1b]

           Figure 1b   Tracing of spectrum on 4 November 1983