IAU COMMISSION 27 UNPUBLISHED DATA FILE 225 4 pages, including cover sheet August, 1990 Photometric measurements of the Delta Scuti variable HN CMa (HR 2724) This file includes photoelectric measurements made during January, 1990 at the South African Astronomical Observatory (SAAO) and ESO. More details can be obtained in a paper entitled 'Amplitude variations of the Delta Scuti variable HR 2724' by Breger, Balona and Grothues, submitted to Astronomy and Astrophysics during 1990. Michel Breger Institut fuer Astronomie Tuerkenschanzstrasse 17 A-1180 Wien Austria ******************************************************************************* Table 1 Yellow differential photometry of HR 2724 Hel.JD dy' 244 7000+ (mag) 894.3820 -0.001 894.4041 -0.001 894.4286 0.003 894.4397 0.002 894.4535 0.003 894.4654 0.005 894.4844 0.002 894.4960 0.003 894.5130 0.000 894.5279 -0.002 894.5397 -0.001 895.3351 0.001 895.3461 0.005 895.3617 0.003 895.3753 -0.002 895.3862 0.000 895.4021 -0.001 895.4166 -0.004 895.4289 -0.003 895.4455 -0.002 895.4614 -0.001 895.4738 0.000 895.4899 0.005 895.5036 0.000 895.5147 0.002 895.5307 -0.004 895.5462 -0.001 896.3057 0.000 896.3211 0.003 896.3349 0.001 896.3455 0.002 896.3606 -0.002 896.3752 -0.005 896.3861 -0.001 896.4017 -0.006 896.4164 -0.004 896.4269 -0.006 896.4437 -0.005 896.4614 -0.001 896.4735 0.000 896.4900 0.003 896.5044 0.010 896.5157 0.010 896.5323 0.008 896.5478 0.006 896.5590 0.008 896.5755 -0.001 896.5900 -0.001 897.2918 -0.002 897.3029 -0.001 897.3183 0.000 897.3323 0.000 897.3431 0.001 897.3618 -0.002 897.3755 0.004 897.3897 0.006 897.4058 0.003 897.4509 0.005 897.4621 0.004 897.4783 0.002 897.4921 0.000 897.5032 0.005 897.5204 -0.003 897.5346 -0.004 898.3461 0.001 898.3645 0.001 898.4244 0.000 898.4347 -0.002 898.4530 -0.003 898.4693 -0.003 898.4799 0.000 898.5619 0.003 898.5799 0.003 898.5974 -0.004 899.3067 0.003 899.3239 0.000 899.3420 -0.003 899.3522 -0.005 899.3693 -0.006 899.3862 -0.002 899.3966 -0.003 899.4147 -0.003 899.4319 -0.001 900.2944 0.002 900.3072 0.003 900.3244 -0.003 900.3435 -0.002 900.3545 -0.003 900.3736 -0.004 900.3900 -0.004 900.4007 0.001 900.4177 -0.002 900.4350 0.000 900.4461 0.003 900.4645 0.002 900.4818 0.002 900.5106 0.004 900.5285 0.003 900.5391 -0.004 900.5590 -0.003 900.5742 -0.001 900.5860 -0.003 900.6011 -0.001 901.3469 0.000 901.3603 -0.001 901.4005 -0.005 901.4295 -0.001 901.4480 0.001 901.4589 0.003 901.5351 0.004 901.5451 0.003 902.2974 -0.004 902.3083 -0.008 902.3246 -0.009 902.3411 -0.005 902.3515 -0.004 902.3678 -0.004 902.3837 0.004 902.3935 0.004 902.4146 0.005 902.4313 0.006 902.4419 0.006 902.4702 0.002 902.4865 0.002 902.4963 0.000 902.5127 -0.002 902.5298 -0.001 902.5404 0.001 902.5580 -0.001 903.2950 -0.005 903.3084 -0.007 903.3254 -0.006 903.3424 -0.006 903.3524 -0.005 903.3691 -0.006 903.3855 -0.004 903.3966 -0.001 903.4142 -0.003 903.4305 0.001 903.4409 0.002 903.4578 0.003 903.4749 0.003 903.4860 0.005 903.5028 0.007 903.5197 0.004 903.5353 0.001 903.5496 0.001 903.5636 -0.003 903.5749 -0.002 903.5891 -0.003 903.6026 -0.005 904.3257 -0.006 904.3421 -0.005 904.3526 -0.002 904.3690 -0.005 904.3852 -0.004 904.3957 0.000 904.4120 0.002 904.4283 0.004 904.4395 0.003 904.4564 0.005 904.4844 0.003 904.5014 -0.002 904.5199 -0.002 904.5302 -0.003 904.5476 -0.008 904.5697 -0.006 904.5787 0.001 904.5925 -0.002 905.3062 0.000 905.3226 0.001 905.3391 0.003 905.3490 0.003 905.3653 0.002 905.3820 0.001 905.3939 0.005 905.4104 -0.003 905.4275 -0.001 905.4383 -0.002 905.4591 -0.003 905.4763 0.002 905.4863 0.004 905.5048 0.001 905.5226 0.000 905.5324 -0.002 905.5515 -0.002 905.5687 -0.002 906.4014 -0.003 906.4180 -0.002 906.4281 -0.002 906.4448 -0.002 907.4367 0.000 907.4459 -0.002 907.4645 0.000 907.4799 -0.003 907.4886 -0.004 907.5046 -0.004 907.5188 0.001 907.5271 0.000 907.5436 -0.001 907.5676 -0.003 910.3028 0.005 910.3131 0.003 910.3339 0.003 910.3525 -0.002 910.3637 0.000 910.3834 -0.006 910.4041 -0.007 910.4142 -0.004 910.4334 -0.004 910.4522 -0.001 910.4628 -0.005 910.4819 0.001 910.5042 0.003 910.5135 0.001 910.5502 -0.003 910.5598 -0.001 910.5793 -0.002 911.3062 0.003 911.3158 0.001 911.3367 -0.001 911.3539 -0.003 911.3633 -0.006 911.3831 -0.006 911.4002 -0.006 911.4113 -0.006 911.4349 -0.004 911.4522 0.003 911.4997 0.003 911.5094 0.002 911.5320 0.002 911.5485 0.003 912.4420 0.001 912.4524 0.000 912.4738 0.000 912.4913 -0.001 912.5032 0.001 912.5216 0.003 913.3799 -0.006 913.3897 -0.002 913.4139 0.001 913.4390 0.002 913.4492 0.002 913.4682 0.001 913.4880 0.002 913.5008 0.005 913.5253 0.003 913.5525 0.003 914.3195 -0.002 914.3397 -0.004 914.3561 0.001 914.3655 -0.004 914.3840 -0.005 914.4035 0.000 914.4131 0.002 914.4314 0.002 914.4480 0.004 914.4594 0.005 914.4785 0.002 914.4946 0.006 914.5037 0.004 Table 2 Red differential photometry of HR 2724 HJD dr 244 7000+ (mag) 899.5387 -0.001 899.5474 0.001 899.5591 -0.002 899.5726 -0.001 899.5871 -0.002 899.6014 0.000 899.6149 0.003 899.6269 0.000 899.6387 0.004 899.6515 0.002 899.6839 0.001 899.6967 0.003 899.7109 0.001 899.7368 -0.001 899.7494 -0.002 899.7604 0.001 899.7714 0.003 899.7863 0.002 899.7947 -0.001 899.8061 0.003 899.8171 -0.002 899.8259 0.001 900.5616 0.000 900.5751 0.000 900.5884 -0.003 900.6013 0.000 900.6132 0.001 900.6241 -0.004 900.6328 -0.002 900.6438 -0.001 900.6572 -0.002 900.7094 0.002 900.7384 0.000 900.7601 0.002 900.8268 -0.002 900.8374 -0.003 901.5783 -0.001 901.5897 -0.001 901.5979 0.000 901.6065 0.000 901.6184 0.002 901.6266 0.000 901.6406 0.000 901.6508 0.000 901.6607 0.002 901.6723 -0.003 901.6881 0.003 901.6959 0.003 901.7049 0.004 901.7135 0.007 901.7265 0.002 901.7558 0.005 901.7711 0.004 901.7821 0.003 901.7919 -0.001 901.8023 0.001 901.8125 -0.003 901.8223 -0.005 901.8324 -0.004 903.5412 -0.001 903.5533 0.000 903.5650 -0.004 903.5777 -0.004 903.5890 -0.004 903.6003 -0.006 903.6159 -0.005 903.6239 -0.003 903.6350 -0.002 903.6485 0.000 903.6564 -0.002 903.6751 0.002 903.6924 0.004 903.7261 0.000 903.7338 0.000 903.7438 0.004 903.7566 0.007 903.7650 0.005 903.7737 -0.003 903.7969 0.000 903.8068 -0.004 903.8151 -0.002 903.8268 0.000 903.8364 0.000 904.5787 0.001 904.5924 0.000 904.6023 0.002 904.6205 0.000 904.6291 0.003 904.6381 0.001 904.6531 -0.001 904.6613 0.000 904.6770 -0.002 904.6879 0.002 904.7002 0.004 904.7104 0.003 904.7254 0.001 904.7373 0.000 904.7615 0.000 904.7798 -0.001 904.8308 0.001 904.8413 -0.002 905.5530 0.000 905.5713 0.000 905.5973 -0.003 905.6104 -0.005 905.6218 -0.004 905.6326 -0.005 905.6429 -0.002 905.6565 0.000 905.6711 0.002 905.6887 0.001 905.7012 0.004 905.7154 0.000 905.7229 0.006 905.7317 0.003 905.7438 0.003 905.7616 0.001 905.7757 -0.004 905.7841 0.000 905.8032 -0.004 905.8146 -0.002 905.8324 -0.003