COMMISSION 27 OF THE I. A. U.
        INFORMATION BULLETIN ON VARIABLE STARS
                     NUMBER 384

                                 Konkoly Observatory
                                 Budapest
                                 1969 October 3


 HBV 475: A NEW PECULIAR EMISSION OBJECT IN CYGNUS

On an objective-prism plate  (Schmidt-camera,
800/1200/2400, 4deg-prism, 580 A/mm at Hgamma) obtained on
Aug. 10/11, 1969, a star with very bright Halpha-line has been
found. Its coordinates are:

    RA_50 = 20h49m02.56s,            D_50 = +35deg23'36.8".

                     
			[FIGURE 1]

Direct photographs in August and September show that this
object is about 2 mag. brighter, both in the blue and red
region, compared with the Palomar Sky Atlas prints (see
Table 1). Blue magnitudes were estimated using the photoelectric 
sequence in NGC 6913 (Ref. 1). The preliminary

           Table 1
Plate No.   Date              B
PSA 0 279   1951 July 8/9   14.5m
PSA 0 288   1951 July 12/13 14.2
  GS 4364   1969 Aug. 22/23 12.4
  GS 4433   1969 Sep. 19/20 12.6

           Table 2
     Star       B           Star B
a = BD +35deg4294  11m1      g 14.5m
b = HD +35deg4290  11.5      h 15.9
       c           12.1      i 16.2
       d           12.7      j 16.2
       e           13.5      k 16.6
       f           14.4      l 17.6:
                             m 17.7:

examination of old plates indicates that before 1951 this
star could have been fainter than 14.5m. Other measurements
of its brightness would be therefore desirable. For that
reason the identification chart with comparison stars, blue
magnitudes of which have also been referred to NGC 6913, is
presented.
      Objective-prism spectra of HBV 475 in the region
lambdalambda3600-6600 A show a very strong Halpha line, strong Balmer
series Hbeta - H10 and He I 5876, moderate [O III] 5007 and
[Ne III] 3869, and faint He II + [Fe II] 5412-14, He I +
[Fe II] 4471, perhaps also He I 3820 and O III 3444. The
continuum is rather strong in red and violet.
      There exist some similarities in the increase of
brightness and in spectral characteristics between HBV 475
and the well-known emission object V 1016 Cyg (MHalpha 328-116),
which lead to the suspicion that both stars could belong to
the same type of objects.

REFERENCE
1/ A. A. Hoag, H. L. Johnson, B. Iriarte, R. I. Mitchell, K. L. Hallam,
   S. Sharpless, Publ. Naval Obs. Vol XVII, Part VII (1961). [BIBCODE 1961PUSNO..17....1H ]

   Hamburg-Bergedorf Observatory
   25 September, 1969    

                          L. KOHOUTEK
               (on leave from the Astronomical Institute
               of the Czechosl. Academy of Sciences, Praha)