Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21733703d&link_type=abstract
American Astronomical Society, AAS Meeting #217, #337.03; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
Spectroscopic analyses of Type Ia supernovae have shown there exist four spectroscopic groups known as core normal, cool, broad-line, and shallow silicon. 1991bg-likes are cools, and cools are dim, undergo a rapid decline in luminosity, and produce significantly less 56 Ni than normal Type Ia supernovae. 1991bg-likes also have an unusually deep and wide trough in their spectrum around 4200 Å and a relatively strong Si II absorption at 6150 Å. We examine the spectroscopy of supernova 1991bg and 1991bg-likes using the highly parameterized synthetic spectrum code SYNOW and find a general agreement with similar studies. Our analysis reveals that this group of supernovae is fairly homogeneous, with many of the blue spectral features fitted by Fe II. The nature of the spectroscopic commonalities as well as the variations in the class is discussed. Further, we attempt to define borders of the class by examining intermediates such as 2004eo.
Baron Eddie
Doull Brandon
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