Chemical Abundances in the Secondary Star of the Black Hole Binary

Kozo Sadakane, Akira Arai, Wako Aoki, Nobuo Arimoto, Masahide Takada-Hidai, Takashi Ohnishi, Akito Tajitsu, Timothy C. Beers, Nobuyuki Iwamoto, Nozomu Tominaga, Hideyuki Umeda, Keiichi Maeda, and Ken’ichi Nomoto Astronomical Institute, Osaka Kyoiku University, Asahigaoka, Kashiwara, Osaka 582-8582 National Astronomical Observatory, 2-21-1 Osawa, Mitaka, Tokyo 181-8588 Liberal Arts Education Center, Tokai University, 1117 Kitakaname, Hiratsuka, Kanagawa 259-1292 Nagoya Science Museum, 2-17-1, Sakae, Naka-ku, Nagoya, Aichi 460-0008 Subaru Telescope, National Astronomical Observatory of Japan, 650 North A’ohoku Place, Hilo, HI 96720, USA Department of Physics and Astronomy and Joint Institute for Nuclear Astrophysics (JINA), Michigan State University, East Lansing, MI 48824, USA Nuclear Data Center, Japan Atomic Energy Agency, Ibaraki 319-1195 Department of Astronomy, School of Science, University of Tokyo, Bunkyo-ku, Tokyo 113-0033 Department of Earth Science and Astronomy, College of Arts and Sciences, University of Tokyo, Tokyo 153-8902 [email protected]