Nova in Cassiopea (nova Cas 2020)

Alerts and Monitoring of Novae

Re: Nova in Cassiopea (nova Cas 2020)

Postby Christian Buil » Thu Aug 13, 2020 3:21 pm

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

Image

Na D1-D2:

Image

Christian
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Re: Nova in Cassiopea (nova Cas 2020)

Postby etienne bertrand » Thu Aug 13, 2020 4:20 pm

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 ?
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Re: Nova in Cassiopea (nova Cas 2020)

Postby Peter Somogyi » Thu Aug 13, 2020 9:27 pm

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 (tons of exposures deserved), much less signal than previously, at poor guiding / windy conditions:
novacas2020_20200812_921.png

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
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Re: Nova in Cassiopea (nova Cas 2020)

Postby Vincent Lecocq » Sat Aug 15, 2020 9:16 pm

Hello,

Hereunder a spectrum of the nova taken last night !


clear skies,
Vincent
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Nova Cas_20200815T175811.png
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Re: Nova in Cassiopea (nova Cas 2020)

Postby Christophe Boussin » Mon Aug 17, 2020 1:14 pm

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 :

_novacas2020_20200815_950_Christophe Boussin_3750_7565.png
Nova Cas 2020 on August 15th, 2020
_novacas2020_20200815_950_Christophe Boussin_3750_7565.png (89.63 KiB) Viewed 1383 times


novacas2020_20200815_950_Christophe Boussin.png
Nova Cas 2020 on August 5th, 6th, 7th and 15th, 2020 (identification of lines from PlotSpectra)

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
CBO (Newton 200 F/5 / Alpy600 / Atik 314L+ / Atik Titan) @ ARAS database
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Re: Nova in Cassiopea (nova Cas 2020)

Postby Francois Teyssier » Tue Aug 18, 2020 6:42 am

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
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Re: Nova in Cassiopea (nova Cas 2020)

Postby Christophe Boussin » Tue Aug 18, 2020 4:58 pm

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 :

_novacas2020_20200817_948_Christophe Boussin_3750_7565.png
Nova Cas 2020 on August 17th, 2020
_novacas2020_20200817_948_Christophe Boussin_3750_7565.png (104.48 KiB) Viewed 1311 times


novacas2020_20200817_948_Christophe Boussin.png
Nova Cas 2020 on August 5th, 6th, 7th, 15th and 17th, 2020 (identification of lines from PlotSpectra)


Evolution of the Halpha line :
novacas2020_20200817_948_Christophe Boussin_Halpha.png
Halpha line on August 5th, 6th, 7th, 15th and 17th, 2020
novacas2020_20200817_948_Christophe Boussin_Halpha.png (24.74 KiB) Viewed 1311 times

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 :
novacas2020_20200817_948_Christophe Boussin_OI.png
[OI] line on August 5th, 6th, 7th, 15th and 17th, 2020
novacas2020_20200817_948_Christophe Boussin_OI.png (26.79 KiB) Viewed 1311 times

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
CBO (Newton 200 F/5 / Alpy600 / Atik 314L+ / Atik Titan) @ ARAS database
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Re: Nova in Cassiopea (nova Cas 2020)

Postby Dubreuil Pierre » Wed Aug 19, 2020 10:18 am

Hello

Clear sky last night for the NOVA

UVEX(3) SC8 red6.3 6x900s

_nova2020cas_20200818_847_Pierre Dubreuil @4100@7500.png
_nova2020cas_20200818_847_Pierre Dubreuil @4100@7500.png (13.31 KiB) Viewed 1272 times


Nova2020Cas@3800@7500.png



Pierre
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Re: Nova in Cassiopea (nova Cas 2020)

Postby Francois Teyssier » Thu Aug 20, 2020 8:36 am

The nova shows oscillations at maximum.

novacas.PNG
novacas.PNG (5.84 KiB) Viewed 1231 times



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
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Re: Nova in Cassiopea (nova Cas 2020)

Postby Vincent Lecocq » Thu Aug 20, 2020 4:14 pm

bonjour,

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

bonne journée,

vincent
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