COMMISSION 27 OF THE I. A. U.
          INFORMATION BULLETIN ON VARIABLE STARS
                      Number 1945

                                   Konkoly Observatory
                                   Budapest
                                   1981 April 1

                                   HU ISSN 0374-0676


      SPECTROSCOPIC OBSERVATION OF CI CYGNI IN 1980


   The visible spectrum of the symbiotic star CI Cygni was 
recorded on September 19, 1980 with the 193 cm telescope at the
Observatoire de Haute-Provence. The spectral range is from
lambda 3700 A to 5000 A and the reciprocal dispersion is 38.2 A/mm
at Hgamma.
  Photometric data by several observers (1), (2) indicate that
the star was at the time in the post-eclipse phase
(V = 10.55, B-V = 0.93, U-B = 0.99).

                        [FIGURE 1]

  The microphotometer tracing represented in Figure 1 shows
the main features of the spectrum which exhibits some strong 
emission lines. So, the following lines are readily observed:

 - [Fe V] :lambdalambda 3891A,4071A (IP : 75 eV)
    which were absent in 1978-79 (3),
 - [Ne III]: lambda 3868 (IP: 63.4 eV) fairly strong,
 - [O III] : lambdalambda5007 A, 4959A, 4363A, (IP : 54.9 eV),
   (note that lambda 5007 line is stronger than lambda 4363 as in
   the 1979's observations (4)).
 - He II: lambda 4686A (IP: 54.4 eV).
      The 2-O absorption band of the TiO alpha-system is present. All
 the identified emission lines are listed in Table I.

                    Table I

lambdaobs    Elements         lambdaobs       Elements

  3770    H 11              	4341      Hgamma
  3797    H 10              	4363     [O III] (2 F)
  3835    Heta                	4388      He I (51)
  3868   [Ne III] (1 F)     	4413      Fe II (32)
  3889    He I (2) + Hzeta  	4417     [Fe II] (6 F)
  3891   [Fe V]  (3 F)      	4471      He I (14)
  3967   [Ne III] 1 F       	4485      Fe II (9)
  3969    Fe II  (3)        	4492      Fe II (37)
  3970    Hepsilon + H I    	4514      N III (3)
  4009    He I   (55)       	4520      Fe II (37)
  4026    He I   (18)       	4541      He II (2)
  4068   [S II]  (1 F)      	4556      Fe II (37) 
  4071   [Fe V]  (1 F)      	4582      Fe II (38)
  4097    N III  (1)        	4629      Fe II (37)
  4102    Hdelta            	4634      N III (2)
  4121    He I   (16)       	4640      N III (2)
  4144    He I   (53)       	4650      C III (1)
  4178    Fe II  (28)       	4656     [Fe III] (3 F)
  4199    He II (3)+NIII(6) 	4685      He II
  4226    Ca I abs          	4712      He I (12)
  4233    Fe II  (27)       	4861*     Hbeta*
  4245   [Fe II]  21 F      	4922      He I (48)
  4267    C II   (6)        	4959     [O III] (1 F)
  4286    Fe II             	5007     [O III] (1 F)

"A doubling of the H_beta line is observed (lambdalambda 4860.5-1.8)


                        R. GRAVINA
     Observatoire de Lyon, Universite Claude Bernard, Lyon I


References:

1 Burchi, R., Di Paolantonio, S., Mancuso, L., Milano, L., and
  Vittone, A.: 1980, I.B.V.S. No. 1871
2 Masaaki Huruhata: 1980, I.B.V.S. No. 1896
3 Gravina, R.: 1980, I.B.V.S. No. 1759.
4 Iijima, T.: 1980, Astron. Astrophys. 94, 290. [BIBCODE 1981A&A....94..290I ]