Table 1: Strömgren photometry of the optical counterpart to 4U 2206+54. The last column indicates the telescope used. a stands for the 1.5-m Spanish telescope at Calar Alto. b represents the 1.23-m German telescope. c is the Skinakas 1.3-m telescope.
Date MJD V (b-y) m1 c1 $\beta$ T
1988, Jan. 7 47168.290 9.909 $\pm$ 0.013 0.257 $\pm$ 0.005 -0.083 $\pm$ 0.007 0.011 $\pm$ 0.007 2.543 $\pm$ 0.040 a
1989, Jan. 4 74531.305 9.845 $\pm$ 0.015 0.257 $\pm$ 0.007 -0.042 $\pm$ 0.010 -0.117 $\pm$ 0.017 2.543 $\pm$ 0.007 a
1991, Nov. 16 48577.401 9.960 $\pm$ 0.034 0.268 $\pm$ 0.005 -0.040 $\pm$ 0.012 -0.041 $\pm$ 0.033 - b
1991, Dec. 19 48610.297 9.969 $\pm$ 0.038 0.271 $\pm$ 0.021 -0.322 $\pm$ 0.006 -0.010 $\pm$ 0.018 2.489 $\pm$ 0.024 b
1994, Jun. 21 49524.500 9.835 $\pm$ 0.019 0.258 $\pm$ 0.013 -0.032 $\pm$ 0.021 0.053 $\pm$ 0.030 2.617 $\pm$ 0.020 b
1996, May 26 50229.642 9.845 $\pm$ 0.012 0.267 $\pm$ 0.007 -0.052 $\pm$ 0.012 -0.074 $\pm$ 0.013 2.553 $\pm$ 0.006 a
1999, Aug. 16 51407.500 9.883 $\pm$ 0.031 0.255 $\pm$ 0.044 -0.226 $\pm$ 0.074 0.298 $\pm$ 0.094 - c


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