1. PhD Program in Astronomy, Department of Physics and Materials Science, Faculty of Science, Chiang Mai University , 50200 Chiang Mai, Thailand
2. Physics and General Science Program, Faculty of Science and Technology, Nakhon Ratchasima Rajabhat University , 30000 Nakhon Ratchasima, Thailand
3. National Astronomical Research Institute of Thailand (Public Organization) , 260 Moo 4, Donkaew, Mae Rim, 50180 Chiang Mai, Thailand
4. Department of Physics and Materials Science, Faculty of Science, Chiang Mai University , 50200 Chiang Mai, Thailand
5. Institute of Astronomy, National Tsing Hua University , 30013 Hsinchu, Taiwan
6. Department of Physics, Faculty of Science, Udon Thani Rajabhat University , 41000 Udon Thani, Thailand
7. Department of Physics and Astronomy, University of North Carolina at Chapel Hill , Chapel Hill, NC 27599, USA