SN2011fe

I've finally managed to catch an échelle spectra of SN2011fe with my C14 spectrograph equipment (calling DeNise in the memories of my grand mother) observatories This spectra is the sum of 15 exposures of 900s taken in two nights, September 22 and 23. As seen here http://www.astrosurf.com/aras/surveys/supernovae/sn2011fe/obs.html the overall shape of the spectra doesn't change in this period. The SN was at 10.5 Vmag and low over the horizon.  The échelle spectrograph is an Eshell... [Lire la suite]

New observation and firstime supernova for me ! A light coming from 20 millons Ly ! At V mag nearly 10.5, this SN is in the range of both low and high resolution amateur spectroscopy. Cause of the doppler broadening effect, the spectral lines are very large and oversize my spectral domain, here around HeII 4686A. But tiny lines in the spectrum maybe insterstellar and intergalactic (!) absorption useful to calculate the extinction of the supernova and then the true brightness and distance (Diffuse interstellar bands (DIB): co-planar... [Lire la suite]