Based on observations obtained with the 2-m telescope of the Rozhen
National Astronomical Observatory, which is operated by the Institute
of Astronomy, Bulgarian Academy of Sciences, and with the 1.3-m telescope
of the Skinakas Observatory, Crete, Greece; Skinakas Observatory is a
collaborative project of the University of Crete, the Foundation
for Research and Technology - Hellas, and the Max-Planck-Institut
für Extraterrestrische Physik.
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