COMMISSION 27 OF THE I. A. U.
            INFORMATION BULLETIN ON VARIABLE STARS
                        Number 2446

                                          Konkoly Observatory
                                          Budapest
                                          16 December 1983

                                          HU ISSN 0374-0676



                   THE H_beta EMISSION OF PU Vul



  The peculiar nova-like variable PU Vul was observed with the grating
spectrograph attached to the 1-m reflector at Yunnan Observatory in September,
1981 and October, 1982. The spectral class of this star was about K without
any emissions in September, 1981. But H_alpha was found in emission in October
1982 (Liu Zongli, Hao Xiangliang and Mei Bao, I.B.V.S. No. 2291, 1983).
  This star was observed using the grating spectrograph attached to the
60/90-cm Schmidt telescope at Peking Observatory on August 29 and September
1, 1983. The two spectra which were obtained on August 29 were essentially
similar to those obtained in October, 1982. But the absorption lines
of two spectra which were obtained on September 1 were weaker and the emission
features were stronger than before and H_beta appeared in emission.


                           [FIGURE 1a]

         Figure 1a. Tracing of spectrum on 30 October 1982

                           [FIGURE 1b]

         Figure 1b. Tracing of spectrum on 9 October 1983


  We observed this star again with the grating spectrograph attached to the
1-m reflector at Yunnan Observatory in October, 1983, obtaining six plates.
The emission lines in all these spectra become so strong that one can readily
see both the H_alpha and H_beta in emission.
  The tracings of the spectra obtained on October 30, 1982 and October 9,
1983 are presented in Figure 1.





                        LIU ZONGLI

                        HAO XIANGLIANG

                 Peking Astronomical Observatory
                        Academia Sinica