Based on data obtained at the German-Spanish Astronomical Center, Calar Alto, which is jointly operated by the Max-Planck-Institut für Astronomie, Heidelberg, and the Instituto de Astrofísica de Andalucía (CSIC) and further data obtained at the Himmelsmoor Private Observatory, Hamburg.

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Appendices are only available in electronic form at http://www.edpsciences.org

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... MaxIm

MaxIm is a commercial software solution for Windows OS from Diffraction Limited, 25 Conover Street, Ottawa, Ontario K2G 4C3, Canada.

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... IRAF

IRAF is distributed by the National Optical Astronomy Observatories, which is operated by the Association of Universities for Research in Astronomy, Inc. under cooperative agreement with the National Science Foundation.

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... MIRA

MIRA AP is commercial software for Windows OS from Axiom Research, Inc., 1830 East Broadway Blvd, Suite 124-202, Tucson, AZ 85719, USA.

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