A low-dispersion Keck I spectrum of SN 1980K taken in 1995 August (t = 14.8 yr after explosion) and a spectrum taken in 1997 November (t = 17.0 yr) at the MDM Observatory show broad 5500 km s-1 mission lines of Hα, [O I] 6300, 6364 Å, and [O II] 7319 73
Robert A. Fesen, Christopher L. Gerardy, Alexei V Filippenko, T. Matheson, Roger A. Chevalier, R. Kirshner, B. Schmidt, Peter Challis, Claes Fransson, B. Leibundgut, Schuyler D. Van Dyk
Szanna Zsíros, Tamás Szalai, Ilse De Looze, Arkaprabha Sarangi, Melissa Shahbandeh, Ori D. Fox, Tea Temim, D. Milisavljević, Schuyler D. Van Dyk, Nathan Smith, Alexei V Filippenko, Thomas G. Brink, WeiKang Zheng, Luc Dessart, J. Jencson, J. Johansson, Justin Pierel, A. Rest, Samaporn Tinyanont, Maria Niculescu-Duvaz, M. J. Barlow, R. Wesson, Jennifer E. Andrews, Geoffrey C. Clayton, Kishalay De, E. Dwek, Michael Engesser, R. J. Foley, Suvi Gezari, Sebastián Gómez, S. Gonzaga, M. M. Kasliwal, Ryan M. Lau,
Szanna Zsíros, Tamás Szalai, Ilse De Looze, Arkaprabha Sarangi, Melissa Shahbandeh, Ori D. Fox, Tea Temim, D. Milisavljević, Schuyler D. Van Dyk, Nathan Smith, Alexei V Filippenko, Thomas G. Brink, WeiKang Zheng, Luc Dessart, J. Jencson, J. Johansson, Justin Pierel, A. Rest, Samaporn Tinyanont, Maria Niculescu-Duvaz, M. J. Barlow, R. Wesson, Jennifer E. Andrews, Geoffrey C. Clayton, ,
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