COMMISSION 27 OF THE I. A. U.
         INFORMATION BULLETIN ON VARIABLE STARS
                     Number 1647

                                    Konkoly Observatory
                                    Budapest
                                    1979 July 26



          PHOTOELECTRIC OBSERVATIONS OF u Her



    Photoelectric observations on the eclipsing variable u Her
(68 Her, BS=HR 6431, HD 156633, BD +33d2864, GC 23359) were
carried out, in B and V, from 1974 to 1978. The observations were
made using the two-beam, multi-mode, nebular-stellar photometer
(Goudis and Meaburn, 1973) of the National Observatory of Athens
attached either to the 25-inch Newall refractor (1974-75), at Penteli
Astronomical Station, or to the 48-inch Cassegrain reflector
(1976-1978) at Kryonerion Astronomical Station (Contopoulos and
Banos, 1976).
    The stars epsilon Her (58 Her, BS 6324, HD 153808) of m_v 3.87 and
B-V=-0.03 and 59 Her (BS 6332, HD 154029) of m_V=5.25 and B-V=+0.02
were used for comparison and checking, respectively. The filters
used are in close accordance with the standard ones. Reduction of
the observations has been made using Hardie's method (1962). The
estimated uncertainties for a single observation are of the order
of +-0.006m in V and +-0.009m in B.

    The following data were found:
Hel.J.D.    Phase    (O-C)    m_V      (B-V)
2440000+             days

2225.5041   Min I    0.0105   5.277   -0.046 Penteli
2279.3438   Max               4.641   -0.001   "
2280.3750   Max               4.643   -0.004   "
2282.4236   Max               4.640   -0.010   "
3283.3264   Max               4.661   -0.019 Kryonerion
3309.4792   Min II   0.0071   5.055   -0.017   "
3310.5069   Min I    0.0093   5.280   -0.046   "
4029.3889   Min II   0.0070   5.073   -0.030   "

In the residuals (O-C) the C values were calculated using
the ephemeris formula given by Kukarkin et al., (1969).





	P. ROVITHIS               H. ROVITHIS-LIVANIOU
	National Observatory      Astronomy Department
	of Athens                 Athens University
	Athens (306)              Panepistimiopolis,
	Greece                    Athens (601), Greece





References:
Contopoulos, G. and Banos, C.: 1976, Sky and Telescope, 51, 154 [BIBCODE 1976S&T....51..154C ]
Goudis, C. and Meaburn, J.: 1973, Astroph.Space Sc. 20, 149 [BIBCODE 1973Ap&SS..20..149G ]
Hardie, R.H.: 1962, Stars and Stellar Systems Vol.II, Astronomical
      Techniques, ed. Hiltner, W.A., The University of Chicago
      Press, Chicago
Kukarkin, B.V. et al.: 1969, General Cat. of Variable Stars, Moscow [BIBCODE 1969gcvs.book.....K ]