Affiliation: | 1. National Observatory of Athens, P. O. Box 20048, Athens, 118 10, Greece 2. Department of Astrophysics, Astronomy and Mechanics, University of Athens, 157 84, Zografos, Athens, Greece 3. Astrophysikalisches Institute Postdam, An der Sternwarte 16, Postdam, Germany 4. Universit?tis-Sternwarte München, Scheinerstrasse 1, 81679, München, Germany 5. Universities Space Research Association NASA/Goddard Space Flight Center Code 662 Greenbelt, Greenbelt, MD, 20771, USA 6. Isaac Newton Group of Telescopes, Apartado de Correos 321, E-38700, Santa Cruz de La Palma, Spain
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