COMMISSION 27 OF THE I. A. U.
       INFORMATION BULLETIN ON VARIABLE STARS
                    NUMBER 301


                                   Konkoly Observatory
                                   Budapest
                                   1968 October 11





    SPECTROGRAPHIC OBSERVATIONS OF THE VARIABLE STAR
               OMICRON ANDROMEDAE




      In 1961 we have begun spectrographic observations
(Pasinetti 1967, 1968) of Omicron Andromedae, considered by
some AA. a photometric double star showing, sometimes, a
shell spectrum.
      We have measured the radial velocities of this star
from forty plates secured in the period 1961-1966 in which
it has been a normal B-type star.

			[FIGURE 1]

      A velocity curve characteristic of the eclipsing
variables does not result from our measures. The velocities
deduced from the first Balmer lines (before H_8) range from
-20 to -50 km/sec in the years later than 1961; this
dispersion is probably real being greater than the mean
square errors. Instead in 1961, the velocities are much
higher owing to the presence of strong cores altering the
velocities. In the figure our results for the first Balmer
lines are plotted against the phases according to the data
of Schmidt (1959); each symbol indicating a different year:
. 1961, x 1962, triangle 1963, + 1964, square 1965, o 1966.
      The values of the other elements are sometimes much
higher than those of hydrogen; the most velocities from Si
are positive. However these results are rather uncertain as
there are few measurable lines and they are very broadened.


                 PIERO GALEOTTI - LAURA E. PASINETTI
                 Osservatorio Astronomico di Merate





REFERENCES


PASINETTI, L.E. 1967, Atti XI Riunione Soc.astr.It., Padova,
           7-9 Ottobre.
PASINETTI, L.E. 1968, Mem.Soc.astr. It., 39, 73. [BIBCODE 1968MmSAI..39...73P ]
SCHMIDT, H. 1959, Z.Astrophys., 48, 249. [BIBCODE 1959ZA.....48..249S ]