COMMISSION 27 OF THE I. A. U.
         INFORMATION BULLETIN ON VARIABLE STARS
                     Number 1510

                                Konkoly Observatory
                                Budapest
                                1978 December 4




       BVRI OBSERVATIONS OF SEMIREGULAR VARIABLES


   Observations on the Johnson BVRI system are reported for
three variables classified as SR in the General Catalogue of
Variable Stars. The Purdue High Speed Photometer, described by
Barnes et al. (1978), was used in obtaining the data. The instrumental 
system and reduction procedures are discussed by Moffett
and Barnes (1979).
   Most of the observations were obtained on the 91-cm and
76-cm reflectors at McDonald Observatory and a few were also
made on the 61-cm reflector at the Table Mountain Observatory
and the No. 2, 91-cm telescope at Kitt Peak National Observatory.
   The results for the three SR variables; U Hya, V441 Her and
R Lyr are given in Table I. The estimated uncertainties for a
single observation are. V = +-0.014, (B-V) = +- 0.009, (V-R) =
+-0.009, and (R-I) = +-0.012.




THOMAS J. MOFFETT       THOMAS G. BARNES
Department of Physics   McDonald Observatory
Purdue University       Department of Astronomy
West Lafayette,         The University of Texas
Indiana 47907           Austin, Texas 78712




References:

Barnes, T.G., Evans, D.S., and Moffett, T.J., 1978, M.N.R.A.S., 183, 285 [BIBCODE 1978MNRAS.183..285B ]
Moffett, T.J., and Barnes, T.G., 1979, P.A.S.P., (in press) [BIBCODE 1979PASP...91..180M ]




              TABLE   I
        SEMIREGULAR VARIABLES
                      U Hya = BS4163
------------------------------------------------
HJD            V      (B-V) (V-R)         (R-I)
(2440000.+)
------------------------------------------------
    3129.01   4.856   2.569 1.784         1.230
    3130.00   4.860   2.519 1.775         1.207

                      V441 Her = BS6685
    3248.97   5.418   0.328 0.318         0.164
    3289.87   5.481   0.363 0.351         0.179
    3290.83   5.502   0.361 0.355         0.196
    3291.88   5.505   0.350 0.334         0.172
    3296.90   5.487   0.348 0.349         0.190
    3297.84   5.497   0.364 0.351         0.173
    3301.82   5.452   0.352 0.322         0.207
    3303.82   5.474   0.339 0.338         0.203
    3303.85   5.451   0.336 0.325         0.176
    3366.70   5.431   0.345 0.334         0.199
    3427.57   5.479   0.377 0.351         0.199
    3620.98   5.456   0.327 0.310         0.180
    3645.88   5.450   0.338 0.314         0.169

                      R Lyr = BS7157
    2920.77   4.149   1.490 2.237         1.851
    2921.78   4.135   1.476 2.246         1.832
    2921.91   4.127   1.479 2.231         1.855
    2922.92   4.118   1.475 2.267         1.804
    2924.78   4.073   1.486 2.244         1.825
    2924.87   4.044   1.476 2.261         1.809
    2924.96   4.051   1.511 2.256         1.801
    2925.86   4.036   1.481 2.225         1.809
    2926.81   4.025   1.476 2.235         1.792
    2926.88   4.042   1.466 2.236         1.794
    2928.73   4.006   1.499 2.215         1.795
    2928.90   4.009   1.487 2.216         1.797
    2928.96   4.015   1.516 2.224         1.798
    2929.86   4.012   1.494 2.221         1.787
    2929.95   4.015   1.498 2.230         1.782
    2930.96   4.009   1.514 2.239         1.762
    2931.75   3.991   1.511 2.188         1.810
    2932.89   3.996   1.479 2.209         1.815
    2932.96   4.000   1.521 2.213         1.815
------------------------------------------------