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Quick update, for those who can follow O I 7772 or 8446: change_novacas2020_20200908_OI7772.png O I 7772 has lost its P-Cyg profile (always there from the beginning, at a similar magnitude). The Ca II IRT region (9 x 1800 sec): change_20200908_906_OI_8446.png O I 8446 has doubled its height and EW r...

Got one more sky, experimentally taken the 8650-9300A region, looking for other rare lines: novacas_20200821_806.png The upper half is contaminated by tellurics (visible also on reference stars) - besides the IR end is really low on signal. Nevertheless, it's showing multiple suspects for a weak and...

Weather cleared again, this time have taken 3 regions with the 300/1200 Newton + LHires III + 600/mm(vis) grating + Orange wratten filter. novacas2020_20200808_826.png Ca II IRT show outstanding intensities and increased velocities, with Paschen end not relevant: novacas2020_20200820_907.png Interes...

Yesterdays result, the random absorptions are not noise - perhaps coicidence with ATEL#13941 (CN / C2 bands?), taken spectra at similar time, and the continuum is strange (used only a linear reference star fit). O I 7772 region: novacas2020_20200812_812.png Shooting Ca II IRT region done while sleep...

Median can be used without artifacts only when the _expected_ values are exactly the same - otherwise filtering out real signal as well... The picture "cal_5x5 median.PNG" speaks clearly against. My earlier experience from deep sky photography tells, simple average (+ sigma clipping for ho...

Inserting an orange wratten filter, experimented in two IR regions with the 600/mm (visual) grating. First taken the O I 7773 region (7450-8160A): novacas2020_20200808_826.png Next, captured the region with O I 8446: novacas2020_20200808_914.png The strong Paschen end contaminated all the O I 8446 a...

At same night as David, R~2000, cloudy sky (could save only 1 x 30 min), 300 x 1200 Newton + APM Barlow 2.67 + LHires III + 600/mm grating + 35 micron slit + ATIK 428 EXm: novacas2020_20200806_941.png Very similar Fe II features to the eShel shown by Christian 1 day before (08.05), except that I hav...

Nice Fe II crowd, David! - I've just started to report similar... Here is my progress from last night, with same exposures as before (however, a windy weather): cmp_NovaCas_0730_31_01.png Balmer (and OI 7772) decrease should be because of the 0.5mag brightness increase from 07.30 to 07.31- despite o...

Hi Robin, Thank you for the line identification, so those all 4 peaks in your spectra then Fe II emissions then! Last night I've made a repeat, same instrument and amount of exposure (6x30 minute) - except that got the star higher: cmp_NovaCas_0730_vs_31.png There is a large Balmer EW decrement (sim...

Last night's result with my 300/1200 Newton, 6 x 30 minute, Alpy 600 (18 micron slit), ATIK 414 EXm: plot_novacas2020_20200730_833.png The reddening is obvious. I am wondering, what can be the emission at 4922A (used to be He I, but it has emission elsewhere). Moreover, O I 7772 has prominent P-Cyg ...