Posted by Robin Leadbeater at 19:12 on 2013 Aug 24
Hi again Mike,I used Visual Spec software to digitise your image and did a 2nd order wavelength calibration on your spectrum (using the bright H alpha, beta, gamma emission lines) The resulting calibration is only a very rough approximation to the true dispersion equation of the prism but comparing with a spectrum taken by Olivier Thizy on the same night,taken from the ARAS databasehttp://www.astrosurf.com/aras/Aras_DataBase/Novae/Nova-Del-2013.htmthe same features are clear in both spectra. (The overall shape is different as Oliver’s spectrum has been corrected for instrument response and atmospheric extinction) (EDIT: There should be an image attached but it is not there for some reason which escapes me)Robin 