tokens: E.H. acknowledges support by the Spanish Ministry of Economy and Competitiveness (MINECO) and the Fondo Europeo de Desarrollo Regional (FEDER) through grant ESP2016-80435-C2-1-R, as well as the support of the Generalitat de Catalunya/CERCA program. D. D. acknowledges support provided by NASA through Hubble Fellowship grant HST-HF2-51372.001-A awarded by the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., for NASA, under contract NAS5-26555. E.S. acknowledges support by the Russian Science Foundation grant No. 14-50-00043 for conducting international photometric observing campaign. I.S. acknowledges support by the Russian Foundation for Basic Research (project No. 17-02-00542). R.B. acknowledges support from FONDECYT Post-doctoral Fellowship Project No. 3180246. M.L. acknowledges support from the Austrian Research Promotion Agency (FFG) under project 859724 “GRAPPA”. S.-H.G. acknowledges the financial support from the National Natural Science Foundation of China (No.U1531121). L.C. recognizes funding from DLR – 50OR1804. Funding for the Stellar Astrophysics Centre is provided by The Danish National Research Foundation (Grant agreement no.: DNRF106). We thank the staff at the various participating observatories STELLA, CASLEO, Calar Alto, TJO, and others for their support. Partly based on data obtained with the STELLA robotic telescopes in Tenerife, an AIP facility jointly operated by AIP and IAC, on data acquired at Complejo Astronómico El Leoncito, operated under agreement between the Consejo Nacional de Investigaciones Científicas y Técnicas de la República Argentina and the National Universities of La Plata, Córdoba and San Juan, on observations collected at the Centro Astronómico Hispano Alemán (CAHA) at Calar Alto, operated jointly by the Max-Planck Institut für Astronomie and the Instituto de Astrofísica de Andalucía (CSIC), and on data obtained with the Joan Oró Telescope (TJO) of the Montsec Astronomical Observatory (OAdM), owned by the Generalitat de Catalunya and operated by the Institute for Space Studies of Catalonia (IEEC). This research has made use of the SIMBAD data base and VizieR catalog access tool, operated at CDS, Strasbourg, France, and of the NASA Astrophysics Data System (ADS).
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