| Institution: | 1. National Optical Astronomy Observatory, 950 N. Cherry Avenue, Tucson, Arizona 85719 USA;2. INAF, Osservatorio Astronomico di Torino, Via Osservatorio, 20, 10025 Pino Torinese TO, Italy;3. Shanghai Astronomical Observatory, Chinese Academy of Sciences, 80 Nandan Rd, 200030 Shanghai, China;1. Department of Physics, Shumen University, 9700 Shumen, Bulgaria;2. IRIDA Observatory, 67 Cherkovna Str., Sofia, Bulgaria;3. Institute of Astronomy and NAO, Bulgarian Academy of Sciences, 72 Tsarigradsko shossee blvd., 1784 Sofia, Bulgaria |
