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Date and Time of the Query: 2019-08-17 T14:47:59 PDT
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For refcode 1996PASJ...48...51S:
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Copyright by Astronomical Society of Japan. 1996PASJ...48...51S Type-Ia Supernova SN 1995D in NGC 2962: Optical V, R, and I Band Photometry and Spectra Kozo SADAKANE, Takee YOKOO, Jun-ichi ARIMOTO, Katsura MATSUMOTO, Satoshi HONDA, and Kazuhito TANABE Astronomical Institute, Osaka Kyoiku University, Kashiwara-shi, Osaka 582 Ken-ichi WAKAMATSU Physics Department, Gifu University, Gifu-shi, Gifa 501-11 Mitsugu NISHIDA Kobe Women's College, Suma-ku, Kobe-shi, Hyogo 654 Michitoshi YOSHIDA Okayama Astrophysical Observatory, National Astronomical Observatory, Kamogata-chou, Okayama 719-02 and Masahide TAKADA-HIDAI Research Institute of Civilization, Tokai University, Hiratsuka-shi, Kanagawa 259-12 (Received 1995 July 12; accepted 1995 November 13) Abstract Optical light curves in the V, R, and I bands, starting 10 days before the maximum light, and the optical spectra near to the V maximum phase of supernova SN 1995D in NGC 2962 are presented. The spectra taken near to the optical maximum are similar to the prototypical type-Ia supernova SN 1981B, and show no trace of the interstellar NaI D line. The expansion velocity at the maximum phase was 1000+/-200 km s^-1^. The supernova reached maximum light in the I band about four days earlier than in the V band. A distinct secondary peak is observed in the I band about 30 days after the V maximum. This secondary peak occurred about one week delayed from the published template light curve. A clear shoulder is detected in the R band light curve corresponding to the secondary peak in the I band. The initial rate of decline is slow [{DELTA}m_15_(V) = 0.66 mag], and it is suggested that the supernova belongs to a group of the intrinsically brightest type-Ia supernovae. From the initial declining rate in the V band, we estimated the absolute magnitude M_v_ to be -18.8+/-0.3 mag, and the distance modulus of the parent galaxy (NGC 2962) to be 32.2+/-0.3 mag. Key words: Photometry - Spectroscopy - Stars: supernovae - Supernovae: individual (SN1995D)
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