Based on observations obtained at the German-Spanish Astronomical Center, Calar Alto, operated by the Max-Planck-Institut für Astronomie, Heidelberg, jointly with the Spanish National Commission for Astronomy, on observations made at the 1.2 m telescope, located at Kryoneri Korinthias, and owned by the National Observatory of Athens, Greece, and on observations made with the OGS telescope, operated on the island of Tenerife by the European Space Agency, in the Spanish Observatorio del Teide of the IAC.

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Table 1 is only available in electronic form at http://www.edpsciences.org

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...IRAF.

IRAF is distributed by the National Optical Astronomy Observatories.

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... range

The classification of Ritter & Kolb (2003) is somewhat confusing, as their use of the UX UMa type disagrees with the more common definition of systems charcterised by persistent broad Balmer absorption lines.

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... properties

With one exception: HS 0229+8016 was observed in August 1992 in a somewhat fainter state, $V\simeq15.0$ , compared to its typical brightness near 14 mag. On that occasion, the Balmer and He I absorption lines were absent/weak, and the strength of the emission lines had markedly increased.

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