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Table 1
Log of CCD observations.
| Filter | λ0 nm | Exposure in seconds and the number of frames |
|
|
||
| U | 345 | 1800(2), 600(1), 480(1), 360(1), 60(1) |
| P | 374 | 1500(2), 360(1), 300(1), 60(1) |
| X | 405 | 960(2), 240(2), 60(1), 20(2) |
| Y | 466 | 600(2), 180(1), 60(1), 40(1), 10(1), 3(1) |
| Z | 516 | 360(2), 90(4), 20(2), 6(1), 4(1) |
| V | 544 | 1500(1), 1200(1), 300(1), 120(2), 20(1), 15(1) |
| S | 656 | 360(2), 90(2), 20(2), 4(1), 3(1) |
Notes. The first two columns give the filter name and its mean wavelength. The numbers of multiple frames of the same exposure length are given in brackets.
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