COMMISSION 27 OF THE I. A. U.
        INFORMATION BULLETIN ON VARIABLE STARS
                     NUMBER 710

                                   Konkoly Observatory
                                   Budapest
                                   1972 August 19


       PHOTOELECTRIC SECONDARY MINIMA OF AK Her


    Differential photoelectric observations of AK Her were
made by Bookmeyer (1) on 28 May 1966 at Kitt Peak National
Observatory. We have obtained the times of heliocentric 
secondary minima via the method of Kwee and Van Woerden (2).The
light elements given by Binnendijk (3)(I) and Kurutac and
Ibanoglu (4)(II) were used to determine O-C's for both 
yellow and blue observations.


                     AK Her

Pri. Min: JD 2436757.6601 +- 0.42152502.E      (I)
Pri. Min: JD 2438531.4318 +- 0.42152309.E      (II)

Secondary Minima     Error     Phase Color    O-C    Elem.
JD 2439274.79119  +-0.00018   0.4868   Y    -0.0056   I
          .79075  +-0.00015   0.4858   B    -0.0060   I
          .79110  +-0.00018   0.5079   Y    +0.0033   II
          .79068  +-0.00017   0.5069   B    +0.0029   II

Evidently, the elements II are to be preferred.




Department of Physics,               DAVID J. KILLIAN
University of Missouri               TERRY W. EDWARDS
Columbia, Missouri 65201, U.S.A.
August, 1972




References

(1)   Bookmeyer, B.B., Indirect Communication, (1972).
(2)   Kwee, K.K., and Van Woerden, H., Bull.Astron.Inst.Neth.
      12, 327, (1956). [BIBCODE 1956BAN....12..327K ]
(3)   Binnendijk, L., Astron.Jour. 66, 27, (1961). [BIBCODE 1961AJ.....66...27B ]
(4)   Kuruta, M., and Ibanoglu, C., IBVS. No. 369, (1969).