Supernova!

These are the links I promised in the Thursday April 30 class. They supplement the lecture on Type Ia supernovae, and the Tuesday class on
Type II. Three corrections: Type II, not IIa were the topic Tuesday.
Type Ia, not Type I were discussed Thursday. Now I know my abc's.

Type Ia indeed show no Hydrogen or He lines, but they do show lines of the very optically active element Si. Not important in our context.

http://csep10.phys.utk.edu/guidry/violence/supernovae-info.html What are supernovae? (Royal Greenwich Observatory)

http://www.pbs.org/wgbh/nova/universe/super2.html Type II (Short slideshow)

http://cse.ssl.berkeley.edu/bmendez/ay10/2000/cycle/snII.html Type II (Simple & correct)

http://www.pbs.org/wgbh/nova/universe/supernova1a_nf_01.html Type Ia (Short slideshow)

http://www.pbs.org/wgbh/nova/universe/supernova1a_nf_01.html News brief about a very distant Type Ia, back when the Universe was decelerating.

http://www.cosmos.swin.edu.au/entries/typeiasupernovalightcurves/typeiasupernovalightcurves.html Short, authoritative look at how the SN Type Ia luminosity was standardized with light-curve data.