Based on data obtained at the Haute-Provence Observatory, INSU/CNRS, France, the Teide Observatory, Tenerife, Spain, the Laboratorio Nacional de Astrofisica/CNPq, Brazil, the Cerro Tololo Interamericain Observatory, Chili, the McDonald Observatory, Texas, USA, the Kitt Peak National Observatory, Arizona, USA, the Mauna Kea Observatory, University of Hawaii, USA, the Beijing Observatory, China, the Naini Tal Observatory, India, The South Africa Astronomical Observatory, South Africa, the Moletai Observatory, Lituania, the Wise Observatory, Israel, the Suhora Observatory, Poland and the Loiano Observatory, Italy.

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Table 2 is only available in electronic form at http://www.edpsciences.org

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