Table A.1: Measured periods, variability amplitudes, and errors of all objects in Run I. In this table all measurements in the filters  VRI are given. The first column gives the total time span covered by the observations followed by the total airmass range of the observations. The next columns describe the noise in each band. For each filter X, the amplitude of variation  $\Delta m_{\rm X}$, the standard deviation of the object  $\sigma _{\rm X}$, the standard deviation of the averaged comparison star  $\sigma _{\rm X}^{{\rm av.}}$, as well as the number of data points are listed. Hence, the variation of the object can be compared to the noise level of the reference stars. The last column gives the determined period together with the 1$\sigma $-error. The numbers in parentheses refer to some comments in the footnotes.
2Object name Time cov. Airmass Object CS # Object CS # Object CS # Period  
  [days] range $\Delta m_{I}$ $\sigma_{I}$ $\sigma_{I}^{{\rm av.}}$ Pts. $\Delta m_{R}$ $\sigma_{R}$ $\sigma_{R}^{{\rm av.}}$ Pts. $\Delta m_{V}$ $\sigma_{V}$ $\sigma_{V}^{{\rm av.}}$ Pts. [days] Rem.
RX J0255.4+2005 8 1.1-2.4 0.088 0.0493 0.0396 22 0.1043 0.0394 0.0202 23 0.1001 0.0874 0.0245 20 3.36 $\pm$ 0.17 (1)
Lk ${\rm H}\alpha$263 8 1.1-2.5 0.22 0.1581 0.0212 21 0.3083 0.1077 0.0148 16 0.3683 0.3186 0.0284 18 6.6 $\pm$ 0.48  
Lk ${\rm H}\alpha$262 8 1.1-2.5 0.457 0.1604 0.0215 19 0.5761 0.15688 0.0148 16 0.7073 0.3488 0.0248 15 1.27 $\pm$ 0.02 (2)
Lk ${\rm H}\alpha$264 8 1.1-2.0 0.4548 0.1442 0.0774 22 0.5017 0.1695 0.0238 16 0.6726 0.2104 0.0533 18 7.4 $\pm$ 0.2  
E0255.3+2018 8 1.1-2.6 0.3398 0.0959 0.0382 16 0.3138 0.0934 0.0392 12 0.307 0.1164 0.0548 12 n.P.  
RX J0312.8-0414NW 8 1.2-1.5 0.12 0.048 0.0346 11 0.146 0.0430 0.0183 8 0.163 0.0501 0.0166 11 n.P. (3)
RX J0312.8-0414SE 8 1.2-1.5 0.08 0.043 0.035 11 0.09 0.0294 0.0183 8 0.1 0.0344 0.0166 11 n.P. (3)
RX J0324.4+0231 8 1.2-3.3 0.223 0.0948 0.0234 15 0.2154 0.0960 0.0112 13 0.2304 0.0874 0.0110 14 4.7 $\pm$ 0.1  
RX J0333.1+1036 8 1.1-2.6 0.116 0.0318 0.0432 11 0.122 0.0458 0.0178 11 0.185 0.0772 0.0247 11 n.P. (4)
RX J0344.8+0359 8 1.2-3.0 0.0599 0.0342 0.0259 11 0.0456 0.0137 0.0085 11 0.0571 0.0211 0.0157 10 1.34 $\pm$ 0.09 (5)
RX J0351.4+0953W 8 1.1-2.6 0.0469 0.0128 0.0112 20 0.0379 0.0130 0.0063 16 0.040 0.0144 0.0054 14 3.65 $\pm$ 0.2  
RX J0407.3+0113N 8 1.2-3.0 0.1043 0.0275 0.0184 26 0.1391 0.0348 0.0107 23 0.0941 0.0280 0.0143 21 n.P. (6)
RX J0407.3+0113S 8 1.2-3.0 0.0861 0.0188 0.0122 28 0.1 0.0383 0.0106 24 0.13 0.0379 0.0135 23 n.P. (6)
RX J0408.2+1956 8 1.1-2.6 0.145 0.0506 0.0075 23 0.1566 0.0558 0.0052 27 0.1403 0.0509 0.0054 28 3.03 $\pm$ 0.04  
RX J0422.9+0141 8 1.2-3.1 0.0512 0.0161 0.0088 10 0.0463 0.0184 0.0034 7 0.045 0.0160 0.0044 7 n.P. (7, 8)
RX J0434.3+0226 8 1.2-3.0 0.105 0.0245 0.0253 29 0.047 0.0122 0.0182 26 0.101 0.0279 0.0218 25 n.P. (3)
RX J0444.7+0813 8 1.1-2.2 0.0722 0.0209 0.0137 21 0.0841 0.0258 0.0059 17 0.1038 0.0344 0.0089 16 2.93 $\pm$ 0.11  
1RXS J044534.0+120917 8 1.1-2.2 0.0666 0.0277 0.0078 14 0.0447 0.0161 0.0052 13 0.0557 0.0201 0.0065 14 3.35 $\pm$ 0.15  
RX J0445.5+1207 8 1.1-2.0 0.0745 0.0193 0.0083 15 0.0558 0.0189 0.0043 13 0.0948 0.0315 0.0045 14 6.34 $\pm$ 0.05 (9)
RX J0450.0+0151 8 1.2-2.6 0.0585 0.0174 0.0127 16 0.0498 0.0159 0.0099 16 0.0673 0.0212 0.0073 17 2.23 $\pm$ 0.03 (10)
RX J0457.1+3142 8 1.1-2.6       4 0.035 0.0106 0.0120 13 0.0992 0.0276 0.0083 24 $P\gg9~\rm {d}$ (11)
RX J0528.9+1046 7 1.1-2.0 0.0495 0.0192 0.0063 11 0.0596 0.0194 0.0049 12 0.0674 0.0239 0.0038 11 7.04 $\pm$ 0.36 (8)
RX J0529.3+1210 7 1.1-1.8 0.0515 0.0194 0.0123 13 0.057 0.0242 0.0090 13 0.0804 0.0308 0.0085 12 2.14 $\pm$ 0.2 (8, 12)
RX J0530.7-0434 8 1.3-3.3 0.091 0.0236 0.0137 25 0.1153 0.0331 0.0124 23 0.1234 0.0385 0.0118 21 9.4 $\pm$ 0.9  
Remarks: (1) some data points had to be averaged to get consistent results; (2) too few data points to reject twice this period; (3) noise comparable to signal, no variation; (4) data not consistent in all filters; (5) alias periods can not be ruled out completely, but all filters give consistent result; (6) noisy data: despite the large number of data points, no convincing period could be found. P=1.5 days or even smaller seems to be likely, a period longer than 2.3 days is highly unlikely; (7) very few data points; (8) spectroscopic binary (see Magazzù et al. 1997); (9) half the period (3.3 days) possible as well, but not likely; (10) there is a flare in the observations; (11) there are also consistent results in the B-filter; (12) corrected after data reduction of Run II. Original value: 2.24 days.

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