1. Kwasan and Hida Observatories, Kyoto University, 17 Ohmine-cho, Kita Kwazan, Yamashina, Kyoto, Kyoto 607-8471, Japan
2. Department of Astronomy, Kyoto University, Kitashirakawa-Oiwake-cho, Sakyo-ku, Kyoto, Kyoto 606-8502, Japan
3. Engineering Science Laboratory, College of Engineering, Chubu University, 1200 Matsumoto-cho, Kasugai, Aichi 487-8051, Japan
4. Faculty of Arts and Sciences, Department of Natural Sciences, Komazawa University, 1-23-1 Komazawa, Setagaya-ku, Tokyo 154-8525, Japan