SN 1991bg: A type Ia supernova with a difference

Bruno Leibundgut, Robert P. Kirshner, Mark M. Phillips, Lisa A. Wells, N. B. Suntzeff, Mario Hamuy, R. A. Schommer, A. R. Walker, L. Gonzalez, P. Ugarte, R. E. Williams, G. Williger, Mercedes Gomez, Ronald Marzke, Brian P. Schmidt, Barbara Whitney, Nelson Caldwell, J. Peters, F. H. Chaffee, Craig B. FoltzD. Rehner, L. Siciliano, T. G. Barnes, K. P. Cheng, P. M.N. Hintzen, Y. C. Kim, Jose Maza, J. Wm Parker, A. C. Porter, P. C. Schmidtke, George Sonneborn

Research output: Contribution to journalArticle

234 Citations (Scopus)

Abstract

We present 13 spectra and 31 photometric observations covering the first 150 days of SN 1991bg in NGC 4374 (M 84). Although SN 1991bg was a type Ia supernova displaying the characteristic Si II absorption at 6150 Å near maximum and the Fe emission lines at late phases, it varied from the well-defined norm for SNe Ia in several important respects. The peculiarities include faster declines in the B and V light curves after maximum, a distinct color evolution, a very red B - V color near maximum, relatively faint peak luminosity, a distinct spectral evolution, and a short peak phase. The narrow peak of the luminosity and the rapid declines of the light curves suggest a smaller mass in the.

Original languageEnglish
Pages (from-to)301-313
Number of pages13
JournalAstronomical Journal
Volume105
Issue number1
DOIs
Publication statusPublished - 1993 Jan

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

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