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Table 1

Exposure time for each telescope used on our observations.

Telescope Exposure times
typicala (s) rangeb (s)

Perkin-Elmer (1.6 m) 30 10120
Zeiss (60 cm) 60 1580
Boller & Chivens (60 cm) 60 15120
ESO/MPG/WFI (2.2 m) 30 30

Notes.

(a)

Typical values without filter for the telescopes at OPD and with R filter for the 2.2 m ESO telescope.

(b)

Exposition time range considering all filters used on the observations.

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