The weather, for astronomy purposes, has been pretty useless in southern Australia for weeks but on 12 June it was clear enough to take some spectra. While I usually only use a 2400 grating with my Lhires III I did have a 150 grating installed for another project , making it nearly well equivalent to the LISA, so I also took the opportunity to grab a spectra of Nova Scorpii 2012. Unfortunately cloud cut my exposure time drastically, hence the poor S/N. No chance yet for a follow-up.
A comparison with Terry's spectra of the H alpha P Cyg shift and EW profiles, separated by four days, would appear to show that the wind expansion rate has slowed while the quantity and/or gas density has increased significantly.
- N Sco 2012.jpg (103.15 KiB) Viewed 1899 times