NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-08-25 T12:34:51 PDT
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For refcode 2000PASP..112.1532V:
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2000PASP..112.1532V SN 1997bs in M66: Another Extragalactic {eta} Carinae Analog? SCHUYLER D. VAN DYK IPAC/California Institute of Technology, Mailcode 100-22, Pasadena, CA 91125; vandyk@ipac.caltech.edu CHIEN Y. PENG Steward Observatory, Astronomy Department, University of Arizona, Tucson, AZ 85721; cyp@as.arizona.edu JENNIFER Y. KING, ALEXEI V. FILIPPENKO, RICHARD R. TREFFERS, AND WEIDONG LI Astronomy Department, University of California, Berkeley, CA 94720-3411; jyking@ugastro.berkeley.edu, alex@wormhole.berkeley.edu, treffers@astro.berkeley.edu, weidong@astro.berkeley.edu AND MICHAEL W. RICHMOND Physics Department, Rochester Institute of Technology, Rochester, NY 14623; mwrsps@rit.edu Received 2000 July 5; accepted 2000 September 1 ABSTRACT. We report on SN 1997bs in NGC 3627 (M66), the first supernova discovered by the Lick Observatory Supernova Search using the 0.75 m Katzman Automatic Imaging Telescope (KAIT). Based on its early-time optical spectrum, SN 1997bs was classified as Type IIn. However, from the BVRI light curves obtained by KAIT early in the supernova's evolution, and F555W and F814W light curves obtained from Hubble Space Telescope archival WFPC2 images at late times, we question the identification of SN 1997bs as a bona fide supernova. We believe that it is more likely a superoutburst of a very massive luminous blue variable star, analogous to {eta} Carinae, and similar to SN 1961V in NGC 1058 (Filippenko et al. 1995) and SN 1954J ("Variable 12") in NGC 2403 (Humphreys & Davidson 1994). The progenitor may have survived the outburst, since the SN is seen in early 1998 at m_F555W_ = 23.4, about 0.5 mag fainter than the progenitor identified by Van Dyk et al. (1999) in a prediscovery image. Based on analysis of its environment in the Hubble Space Telescope images, the progenitor was not in an H II region or association of massive stars. The recent discovery of additional objects with properties similar to those of SN 1997bs suggests that the heterogeneous class of Type IIn supernovae consists in part of "impostors."
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