COMMISSION 27 OF THE I.A.U.
                 INFORMATION BULLETIN ON VARIABLE STARS
                              Number 1269

                                                         Konkoly Observatory
                                                         Budapest
                                                         1977 April 19


       REQUEST FOR PHOTOMETRIC OBSERVATIONS OF U CEPHEI

From summer, 1974 to late 1976, U Cep has undergone a series of
transient mass-transfer event. These were accompanied by major photometric 
anomalies inside and outside primary eclipse (Olson, 1976, 1977a).
Evidence has been found for an H^- emission shell around the cool 
component (Olson, 1977b). Large brightness variations on time scales of
hours to months were observed during much of this interval. In an 
attempt to fill in large gaps in the observations, I am soliciting all
photoelectric filter photometry made during the above interval. Experience
suggests that even fragmentary observations, at any orbital phase, maybe
of assistance.
   Please identify comparison stars and include magnitudes (if available, 
and if HD 6006 was not used). If photometry is non-standardized,
include effective wavelengths of filter-photomultiplier combination. 
Indicate also if the nearby visual companions were excluded from the 
observations. Any observations received will be properly acknowledged.


                                            E.C. OLSON

                                            University of Illinois
                                            Department of Astronomy
                                            Urbana, Illionis 61801



References:

Olson, E. C. 1976, Astrophys. J, 204, 141. [BIBCODE 1976ApJ...204..141O ]
--------  1977a (submitted to the Astrophys. J.)
--------  1977b (submitted to the Publ. A. S. P.)




                   [From IBVS 1287]

           Correction to I.B.V.S. No. 1269

   The third sentence ("Evidence has been found...") should
be omitted.

                                          E.C. OLSON