COMMISSION 27 OF THE I. A. U.
       INFORMATION BULLETIN ON VARIABLE STARS
                    NUMBER 170


                                     Konkoly Observatory
                                     Budapest
                                     15 December 1966




                      EU TAURI

      Three colour photoelectric observations were made on the
star EU Tauri (BD +18d955, HD 38321, S 3736, Wood 197) on seven
nights beginning in Oct., 1966 and continuing to the present time,
Dec., 1966. The observations were made on the 28 inch reflector at
Flower and Cook Observatory using BD +18d959 and BD +18d966 as
the comparison and check stars respectively.

      The results of the partially reduced observations show that
EU Tauri is definitely not an eclipsing variable star as described in
The Finding List for Observers of Eclipsing Variables (Wood et al,
University of Pennsylvania Astro. Series, Vol. IX, 1963.). In this
list EU Tauri appears as star No. 197 and is classified as a W Ursae
Majoris type eclipsing variable with a period of 0.5954 days. This
data was originally obtained by Azarnova from photographic 
observations in 1950-1951 (Azarnova, Variable Stars Vol. 9, p. 45, 1953.).
The results of my observations indicate, rather, that EU Tauri is a
classical cepheid with a period of about 2.105 days, having a light
curve typical of that of a cepheid of this short period.

      Observations made at maximum and minimum light yield the
following amplitudes for this star:

    DeltaV' = 0.35,      DeltaB' = 0.46,       DeltaU' = 0.53


       The preliminary elements are given at this time as:

          Elements: Blue max. JD 2439450.665 + 2.105d E

                    Ptg. mag. about 8. 6 - 9.1

      The completion of the remainder of the light curve will 
hopefully be made in the next few months with additional data from future
observations and from observations made here on the same telescope
in 1963-1964 by L. Binnendijk. Publication of the complete light curve 
in U, B, V magnitudes with a refined Ephemeris and other photometric
parameters characterizing this star will be made in the near future.
The data from all previous observations (those of Azarnova and 
Binnendijk) will be studied in detail for any real period and light changes
that may have taken place.



    Flower and Cook Observatories
    December 8, 1966




                              EDWARD F. GUINAN