COMMISSION 27 OF THE I. A. U
        INFORMATION BULLETIN ON VARIABLE STARS
                     NUMBER 219

                                Konkoly Observatory
                                Budapest
                                15 August 1967


         THE SPECTRUM OF CH CYGNI IN JULY


A spectrogram of CH Cygni has been taken July 15, 1967 at the grating
spectrograph of the 77 inch coude of the Haute Provence Observatory. The
dispersion is 9.7 A/mm and the spectral range 3600-5050 A. CH Cygni shows a
violet continuum (Lambda<4000 A) stronger than that of the comparison star 30
Her (M6). About 50 emission lines have been measured: the Balmer series from
H Beta to H 14 and the H and K of CaII show P Cygni contours. The He series
corresponding to the transition from terms n^3D to 2^3P^o state is present
except Lambda 4026; also the HeI metastable lines 5015 and 3888 are present.
All these lines show broad emissions. FeII and [FeII] are present with sharp
emission lines as pointed out by A.J. Deutsch (Mt. Wilson and Palomar Annual
Report page 11, 1963). Emission of MgI 4571, TiII 4468 and 4501, and the
nebular line 4068 identified by A.D. Thackeray (M.N. 113, 211; 1953) and by
L.H. Aller, T. Dunham Jr. (Ap.J. 146, 126, 1966) in Eta Car as [SII] are
present.


                                                ROSANNA FARAGGIANA




                 BRIGHTNESS VARIATIONS OF CH CYGNI


Photoelectric observations in U, B, V still in progress confirm the
communication by Fehrenbach and Marsden about the variations in U brightness.
Moreover, same irregular variations are shown in B-light, reaching sometimes
about one tenth of magnitude in one or two minutes. Provisional data not yet
fully reduced show for the period 30 June - 2 August a little decrement of
about 0.2 mag. both in V and in B-V.


Trieste Astronomical Observatory
August 1967
                                                  BRUNO CESTER