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Kawabata (2), Kozo Sadakane (3), Masaomi Tanaka (7), Masayuki Yamanaka (1, Naohiro Takanashi (6), National Astronomical Observatory of Japan), Osaka Kyoiku University (4) Nishi-Harima Astronomical Observatory (5) Gunma Astronomical Observatory (6) National Astronomical Observatory of Japan (7) Department of Astronomy, School of Science, Shinobu Ozaki (8), Shin-ya Narusawa (4), University of Tokyo (8) Okayama Astrophysical Observatory","submitted_at":"2009-04-17T18:40:10Z","abstract_excerpt":"We present optical spectroscopic and photometric observations of Type Ia supernova (SN) 2006X from --10 to +91 days after the $B$-band maximum. This SN exhibits one of the highest expansion velocity ever published for SNe Ia. At premaximum phases, the spectra show strong and broad features of intermediate-mass elements such as Si, S, Ca, and Mg, while the O{\\sc i}$\\lambda$7773 line is weak. The extremely high velocities of Si{\\sc ii} and S{\\sc ii} lines and the weak O{\\sc i} line suggest that an intense nucleosynthesis might take place in the outer layers, favoring a delayed detonation model. 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