标题： SN 1997bs 在M66：另一个河外Eta Carinae类比？ 显示英文标题

标题： SN 1997bs in M66: Another Extragalactic Eta Carinae Analog?

摘要： 我们报告了在NGC 3627（M66）中的SN 1997bs，这是通过使用0.75米卡特曼自动成像望远镜（KAIT）的利克天文台超新星搜寻发现的第一颗超新星。 根据其早期光学光谱，SN 1997bs被归类为IIn型超新星。 然而，基于KAIT在超新星演化早期获得的BVRI光变曲线，以及从哈勃太空望远镜档案WFPC2图像中获取的F555W和F814W光变曲线，我们质疑将SN 1997bs识别为真正的超新星。 我们认为它更可能是一颗非常大质量发光蓝变星的超级爆发，类似于Eta Carinae，并且类似于NGC 1058中的SN 1961V（Filippenko等人1995年[AJ, 110, 2261]）和NGC 2403中的SN 1954J（“可变12”）（Humphreys & Davidson 1994 [PASP, 106, 1025]）。 由于在1998年初观测到的m_F555W=23.4的亮度比Van Dyk等人（1999年，[AJ, 118, 2331]）在预发现图像中识别的前身暗约0.5个星等，因此超新星可能在爆发后幸存下来。 通过对哈勃太空望远镜图像中环境的分析，前身星并不在H II区或大质量恒星的关联中。 最近发现的具有与SN 1997bs类似性质的额外天体表明，IIn型超新星这一异质类别的超新星部分包括“冒充者”。 显示英文摘要

摘要： 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 super-outburst of a very massive luminous blue variable star, analogous to Eta Carinae, and similar to SN 1961V in NGC 1058 (Filippenko et al. 1995 [AJ, 110, 2261]) and SN 1954J (``Variable 12'') in NGC 2403 (Humphreys & Davidson 1994 [PASP, 106, 1025]). 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, [AJ, 118, 2331]) in a pre-discovery 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.''