COMMISSION 27 OF THE I. A. U.
        INFORMATION BULLETIN ON VARIABLE STARS
                    Number 2413

                                      Konkoly Observatory
                                      Budapest
                                      17 October 1983

                                      HU ISSN 0374-0676



       BVRI PHOTOMETRY OF THE ECLIPSING BINARY QX Cas




   During a program to observe Classical Cepheids, we included the
eclipsing binary QX Cas since it was located in the same field as the
Cepheids CE Cas and CF Cas.
   The differential observations were transformed to the Johnson BVRI
system through use of standards given by Moffett and Barnes (1979a,b).
Nightly extinction determinations from stars given by Barnes and Moffett (1979)
were used to define mean seasonal extinction coefficients which were used in
the final data reduction. More details on the reduction procedures are given
by Moffett and Barnes (1979a).
   The variable was measured differentially with respect to the two
comparison stars whose adopted values are given in Table I.




                  Table I.

          Adopted Comparison Star Values
        ------------------------------------------
        SAO    V    (B-V)       (V-R)        (R-I)
        ------------------------------------------
        20968 8.037 1.107       0.839        0.526
        20972 9.948 0.658       0.676        0.488
        ------------------------------------------


   The data for QX Cas are given in Table II where the phases were
calculated using the values: P = 6.00471 days, Epoch = 2435755.0 as
given in the General Catalogue of Variable Stars.

                      Table II
              BVRI Photometry of QX Cas
---------------------------------------------------
             HJD-
Phase      2440000     V      (B-V)   (V-R)   (R-I)
---------------------------------------------------
.001       4215.6400 10.275   0.305   0.319   0.230
.060       4984.5988 10.161   0.309   0.339   0.204
.089       4912.7195 10.228   0.300   0.338   0.200
.121       4822.8416 10.159   0.318   0.326   0.189
.163       4222.6207 10.203   0.307   0.320   0.221
.174       4216.6821 10.173   0.300   0.322   0.167
.247       4913.6639 10.190   0.278   0.323   0.205
.266       4913.7773 10.190   0.276   0.335   0.193
.282       4913.8784 10.176   0.309   0.299   0.212
.328       4223.6130 10.200   0.316   0.317   0.213
.334       4217.6420 10.216   0.296   0.318   0.226
.387       4139.8985 10.218   0.321   0.304   0.248
.389       5010.5964 10.203   0.293   0.329   0.209
.407       4986.6857 10.163   0.326   0.320   0.184
.408       4914.6310 10.216   0.302   0.326   0.212
.417       4914.6880 10.219   0.303   0.341   0.223
.418       4908.6895 10.201   0.294   0.329   0.224
.462       4554.6741 10.181   0.284   0.322   0.228
.509       4218.6927 10.207   0.300   0.317   0.226
.556       5011.5975 10.184   0.309   0.325   0.247
.556       4140.9158 10.130   0.333   0.334   0.169
.577       4105.0090 10.143   0.272   0.335   0.170
.591       4909.7267 10.211   0.300   0.324   0.186
.630       4555.6845 10.221   0.286   0.335   0.199
.889       4142.9140 10.154   0.325   0.332   0.178
.904       4941.6326 10.202   0.317   0.329   0.171
.941       4821.7571 10.185   0.319   0.326   0.210
.945       4911.8499 10.212   0.285   0.338   0.184
.956       4821.8496 10.251   0.296   0.337   0.215
.975       4821.9646 10.316   0.305   0.335   0.218
---------------------------------------------------


THOMAS J. MOFFETT          THOMAS G. BARNES, III
Department of Physics      McDonald Observatory
Purdue University          Department of Astronomy
West Lafayette, IN 47907   U.S.A. The University of Texas
                           Austin, TX 78712 U.S.A.





References:
Barnes, T.G., and Moffett, T.J. 1979, Pub. A.S.P., 91, 289. [BIBCODE 1979PASP...91..289B ]
Moffett, T.J., and Barnes, T.G. 1979a, Pub. A.S.P., 91, 180. [BIBCODE 1979PASP...91..180M ]
Moffett, T.J., and Barnes, T.G. 1979b, A.J., 84, 627. [BIBCODE 1979AJ.....84..627M ]