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Are there standard spectra references as 1a SNe develop?
Good work on the 2013aa spectra, Terry! Especially given the conditions. If astronomy has a noble tradition like theatre's 'The Show Must Go On,' you are the role model. Your comment re. the 03/10 image's relation to a 1a in its 19th day got me to wondering if there are standard spectral charts astronomers employ to compare the chronological and line variation intensities as a 1a progresses through its cycle for folks like you who keep your grating on their pulse, so to speak. If such exist and are available for 1a SNe, might they also be available for 2b SNe, etc? Further on the nitty-gritty aspect, is there a document or reference that details how individual line intensities vary over the cycle so we could see with our own eyes which chemical abundances are being seeded into the local ISM as they occur?
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