COMMISSION 27 OF THE I. A. U.
         INFORMATION BULLETIN ON VARIABLE STARS
                     Number 3100 


                                   Konkoly Observatory
                                   Budapest
                                   15 October 1987

                                   HU ISSN 0374-0676




     THE PROPER MOTION OF THE AGK3 VARIABLE STARS. V:
                  Z Del and NSV 12844

  This is the fifth note on a program conducted to 
redetermine the proper motion of those AGK3 variable stars for
which the published values seem to be affected by spurious
errors. On the previous notes (e.g. Lopez 1986, Lopez and
Torres 1987) only red variables were discussed. The results
obtained there are in agreement with Stephenson's (1978)
hypothesis referred to the systematic errors of the AGK3
reddest stars. Due to the importance of the AGK3 and the
variable stars in general in the coming satellite missions,
it seems to be convenient to include in this program all
kinds of variables or suspected variables without regard
to magnitude, spectral characteristics or type of 
variability.
   In this note Z Del = AGK3 +17 2218 and NSV 12844 = AGK3
+5 2903 are presented. The AGK3 proper motion of these
stars is: mu alpha=+0.096", mu delta=-0.029" for Z Del and 
mu alpha=+0.009", mu delta=-0.163" for NSV 12844.
   First-epoch positions were obtained from the re-reduction 
of the published plate material of the Astrographic
Catalogue (AC) (see Table I). Second-epoch positions were
derived from new plates taken with the Yale Southern 
Observatory double astrograph. First and second-epoch plates
were reduced using AGK3 stars as reference system. The
average mean error for the first-epoch positions is +-0.32"
in both RA and DEC while for the second-epoch positions
it is +-0.28". The resulting proper motions are affected by
+-0.005" (me) in both coordinates.
  Table II summarizes the values obtained in this note.

      Table I. Astrographic Catalogue Plate Material.

Star        AC          Plate Center   Zone      Object   Epoch
                        No. h  m        (d)       No.
NSV 12844   Toulouse    151 20 04       +05       110      1897.65
Z Del       Bordeaux    522 20 28       +17       68       1900.62
            
            Table II. New Positions and Proper Motions.

Star        RA    (1950)  DEC             mu alpha mu delta    Epoch
            h  m  s        d  '  "         ("/yr)    ("/yr)
NSV 12844   20 07 16.74   +05 21 37.8      -0.007    -0.003   1986.68
Z Del       20 30 21.71   +17 16 49.0      -0.013    -0.009   1986.43




                    CARLOS E. LOPEZ
                    Felix Aguilar Observatory and
                    Yale Southern Observatory
                    Benavidez 8175 (oeste)
                    5413 Chimbas - San Juan
                    Argentina

References:
Lopez, C.E. 1986. Inf. Bull. Var. Stars No. 2864.
Lopez, C.E., Torres, J.E. 1987. Inf. Bull. Var. Stars No. 2980.
Stephenson, C.B. 1978. Astron. J. 83, 816. [BIBCODE 1978AJ.....83..816S ]