spectro-aras.com

Hi Christian, excellent spectrum! The comparison shows difference especially in the blue part of the spectrum. I think Alpy 600 and Lisa are capable to better concentrate blue/UV light while Lhires 150 tends to vertically disperse it due to the doublet chromatic aberration.

Enjoy OHP workshop, please greet all friends there!

Paolo

New spectrum of SN2013ej in Messier 74:



(T200 telescope + Alpy 600 - 4 x 600 s exposure).

The Halpha line is now evident. Notre large variatiion from my latest 31/07 observation.

http://www.astrosurf.com/buil/supernovae/2013/obs.htm

Christian