tokens: The authors would like to thank the anonymous referee for her or his valuable comments, which substantially helped to improve the quality of the paper. This research has made use of SIMBAD, 2MASS, the GCVS catalogue, and the AAVSO variable search index. D.A. acknowledges the USRA NASA postdoctoral programme and the support of the Center for Space and Habitability of the University of Bern. S.C. acknowledges the Hungarian OTKA Grant K113117. D.K. gratefully acknowledges the support of the Center for Space and Habitability of the University of Bern and the MERAC Foundation for partial financial assistance. This work has been carried out within the frame of the National Centre for Competence in Research PlanetS supported by the Swiss National Science Foundation. D.K. acknowledges the financial support of the SNSF. HIPO work at Lowell is supported by USRA subcontract 8500-98-003. FLITECAM work at UCLA is supported by USRA subcontract 08500-05, PI Ian McLean. M.G. acknowledges financial support by the Helmholtz association, PD-015, and the Technische Universität Berlin.
ner_tags: O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O B-Database B-Survey O B-Survey O O O B-Organization O O O B-Person O O B-Fellowship I-Fellowship I-Fellowship I-Fellowship O O O O O B-Organization I-Organization I-Organization I-Organization I-Organization O O B-Organization I-Organization I-Organization B-Person O O B-Location B-Grant I-Grant I-Grant B-Person O O O O O O B-Organization I-Organization I-Organization I-Organization I-Organization O O B-Organization I-Organization I-Organization O O B-Organization I-Organization O O O O O O O O O O O O O O O B-Organization I-Organization I-Organization I-Organization I-Organization I-Organization I-Organization O O O B-Organization I-Organization I-Organization I-Organization B-Person O O O O O O B-Organization B-Instrument O O B-Observatory O O O B-Organization B-Grant I-Grant B-Instrument O O B-Organization O O O B-Organization B-Grant I-Grant O B-Person I-Person B-Person O O O O O B-Organization I-Organization B-Grant O O B-Organization I-Organization I-Organization