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A high resolution of the nova, August12.9 (presence of cirrus cloud), eShel, R=12000. Halpha



Na D1-D2:



Christian

Super spectre Christian,

Au niveau du SNR entre Eshel et Lhires, sur Ha par exemple quel est le spectro qui donne le meilleur signal pour temps de pose équivalent ?

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: Shooting Ca II IRT region done while sleep (tons of exposures deserved), much less signal than previously, at poor guiding / windy conditions: No Paschen-end contamination for now, they seem to be fully vanished in 4 days!
Having some wide absorptions (8600-8700A), question is where they are from.
Peter

Hello,

Hereunder a spectrum of the nova taken last night !


clear skies,
Vincent

Hello all,

Finally the weather has become good again ... for a while !
I obtained the following spectrum of the nova Cas 2020 the 15th of August at 22 h 48 TU with my Alpy 600 (resolution of 507, JJ = 2459077.4501) and an acquisition time of 75 min :
As in the spectrum of Vincent, I note a very strong increase in the relative intensities of the Balmer and Fe II lines, the modification of the shape of the Halpha line and the development of new lines !!

Good luck and clear skies to all for the monitoring of the nova !

Christophe BOUSSIN

As in the spectrum of Vincent, I note a very strong increase in the relative intensities of the Balmer and Fe II lines, the modification of the shape of the Halpha line and the development of new lines !!

Yes!
You have also [O I] 6300. This is the [O I] flash: the ejecta is becoming optically thin in the visible range.

Recall: evolution of a classical nova Del 2013: http://www.astrosurf.com/aras/novae/Nova2013Del-2.html with Steve Shore comments

All the best,
François

Hello all,

Thank you François for this clarification !!
The evolution of the spectrum over the last few days is really exciting !!

Taking advantage of a new more durable weather window, I obtained the following spectrum last night of the nova Cas 2020 the 17th of August at 22 h 45 TU with my Alpy 600 (resolution of 507, JJ = 2459079.4481) and an acquisition time of 80 min :

Evolution of the Halpha line : The relative intensity and the shape of the Halpha line seems to continue to change but, of course, this requires confirmation at high resolution...


Evolution of the [OI] line : The relative intensity of the [OI] line seems to have increased since the 15th...to be continued !

Clear skies to all for monitoring the evolution of the nova !!

Christophe BOUSSIN

Hello

Clear sky last night for the NOVA

UVEX(3) SC8 red6.3 6x900s

Pierre

The nova shows oscillations at maximum.

The light curve is atypical for a classical , with a very slow rise and now the oscillations.
Daily monitoring at all resolutions is encouraged.

All the best,
François

bonjour,

ci-dessous le spectre de la Nova pris le 19 aout entre 02 h et 03h à l'observatoire Sirene,

bonne journée,

vincent