Based on observations obtained with
the 1.52 m and 3.6 m telescopes of the European Southern
Observatory (ESO),
the 1.93 m telescope of the Observatoire de
Haute-Provence (OHP),
the 2.3 m telescope of the Australian National University
(ANU) at Siding Spring,
and the William Herschel Telescope (WHT) at La Palma.
This research has made use of the AFOEV database,
operated at CDS, France.
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