COMMISSION 27 OF THE I. A. U.
         INFORMATION BULLETIN ON VARIABLE STARS
                     Number 1518

                                Konkoly Observatory
                                Budapest
                                1978 December 20



      BVRI OBSERVATIONS OF RED IRREGULAR VARIABLES


    Observations on the Johnson BVRI system are reported for
four variables classified as Lb 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 four Lb variables; BL Ori, psi Vir,
BY Boo and sigma Lib are given in Table I, The estimated uncertainties 
for a single observation area V = +-0.014, (B-V) = +-0.009,
(V-R) = +-0.009 and (R-I) = +-0.012.



THOMAS G. BARNES III       THOMAS J. MOFFETT

McDonald Observatory       Department of Physics
Department of Astronomy    Purdue University
The University of Texas    West Lafayette, 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., (submitted) [BIBCODE 1979PASP...91..180M ]




              TABLE I.
            Irregular Variables
              BL Ori = BS2308
---------------------------------------------
HJD              V      (B-V)   (V-R)   (R-I)
(2440000+)
---------------------------------------------
      3128.79   6.110   2.391   1.744   1.260
      3129.70   6.131   2.435   1.765   1.259
      3130.83   6.169   2.382   1.764   1.144
      3132.73   6.191   2.396   1.772   1.161
      3135.87   6.192   2.404   1.782   1.149
      3138.86   6.212   2.396   1.792   1.137
      3144.78   6.226   2.438   1.794   1.139
      3429.96   6.071   2.439   1.711   1.081
      3508.83   6.352   2.493   1.878   1.090
      3516.80   6.429   2.502   1.909   1.110
      3517.77   6.442   2.502   1.917   1.096

                 psi Vir = BS4902
      3248.80   4.785   1.631   1.479   1.317
      3248.82   4.796   1.628   1.482   1.314
      3251.78   4.964   1.614   1.499   1.316
      3517.04   4.821   1.577   1.489   1.275
      3620.80   4.748   1.598   1.492   1.237
      3621.79   4.734   1.589   1.475   1.257
      3664.73   4.794   1.614   1.508   1.286
      3669.68   4.784   1.615   1.498   1.272
      3671.70   4.732   1.625   1.496   1.270
      3672.58   4.762   1.623   1.493   1.292
           
                  BY Boo = BS5299
      2921.66   5.279   1.533   1.957   1.698
      2921.75   5.258   1.540   1.954   1.723
      2922.74   5.258   1.523   1.979   1.737
      2922.84   5.251   1.546   1.968   1.729
      2922.91   5.276   1.540   2.003   1.706
      3287.80   4.975   1.548   1.752   1.615
      3291.67   5.100   1.540   1.751   1.687
      3292.69   5.117   1.545   1.770   1.680
      3297.69   5.238   1.540   1.805   1.740
      3300.75   5.329   1.513   1.829   1.749
      3621.81   5.216   1.541   1.833   1.648
      3622.81   5.238   1.535   1.839   1.662
      3663.73   5.141   1.551   1.813   1.651
      3667.68   5.106   1.574   1.787   1.626
      3668.68   5.107   1.558   1.800   1.632
      3669.76   5.104   1.562   1.807   1.629
      3672.70   5.129   1.567   1.800   1.667
             
                    sigma Vir = BS5603

      2921.76   3.364   1.638   1.583   1.265
      2922.85   3.344   1.664   1.594   1.256
      ---------------------------------------