During nova Sgr 2012 No. 4, see topic:
viewtopic.php?f=5&t=370&p=1290#p1290
I have taken high resolution spectra with eShel spectrograph. The sky background is not substracted
(not easy with nono-fiber spectrograph design like eShel) and the consequence...
The full spectrum:
and now a detail of green-yellow region:
We can see the very narrow Earth auroral line (because intense solar activity !) - with spectrograph,
aurora can be see at low latitude!) and also some
city lights pollution line. These lines are not from the nova (do not mistake)
Christian Buil
Sky pollution and fiber spectrograph
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