This study is based on observations obtained with the 1.3-m Warsaw telescope at the Las Campanas Observatory, Chile, during the OGLE-II and OGLE-III projects, between 1997 and 2008. (4 data files).
Department of Physics National and Kapodistrian University of Athens University Campus GR-157 84 Zografou, Athens Tel.: (+30) 210-7276721 email: deshatzi@phys.uoa.gr
