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Re: Nova in Cassiopea (nova Cas 2020)

Posted: Thu Sep 03, 2020 1:18 pm
by etienne bertrand
Le spectre de la Nova Cas 2020 hier soir au LhiresIII R=14 000
En comparaison avec des étoiles Be pour voir la largeur de la raie !
3 x 1200s ; C11 ; F/10 ; Atik314L+ ; Bin1x1 ; fente 35µm
Image

Re: Nova in Cassiopea (nova Cas 2020)

Posted: Fri Sep 04, 2020 10:46 am
by Joan Guarro Flo
Hello,

You can see Nova Cas 2020 through the SC16" and the NOU_T echelle with one ATIK460EX.

Cheers, J. Guarro.

Re: Nova in Cassiopea (nova Cas 2020)

Posted: Sat Sep 05, 2020 6:23 pm
by Francois Teyssier
Another classical nova with oscillation at maximum luminosity.
NovaCas2020.PNG
NovaCas2020.PNG (6.16 KiB) Viewed 6303 times
Daily monitoring is recommended

Database: http://www.astrosurf.com/aras/Aras_Data ... as2020.htm

François

Re: Nova in Cassiopea (nova Cas 2020)

Posted: Sun Sep 06, 2020 3:55 pm
by Christian Buil
Close look of Halpha line the 5.9 September, extracted from eShel(2) spectrum at R=12000 (T250 telescope + ASI6200MM camera):

Image

and after H2O line removed (synthetic spectrum of the atmosphere):

Image

Christian Buil

Re: Nova in Cassiopea (nova Cas 2020)

Posted: Tue Sep 08, 2020 10:07 pm
by Christophe Boussin
Hello all,

For information, a recent telegram about the spectroscopy of Nova Cas 2020 :

http://www.astronomerstelegram.org/?read=13998

Christophe BOUSSIN

Re: Nova in Cassiopea (nova Cas 2020)

Posted: Wed Sep 09, 2020 6:21 am
by Christophe Boussin
Hello all,

Here is my new update for the nova Cas 2020 with the following spectrum obtained the 6th of September at 21 h 38 TU with my Alpy 600 (resolution of 514, JJ = 2459099.4016) and an acquisition time of 70 min :
Nova Cas 2020 on September 6th, 2020
Nova Cas 2020 on September 6th, 2020
_novacas2020_20200906_902_Christophe Boussin_3750_7565.png (77.91 KiB) Viewed 6215 times
Nova Cas 2020 on August 5th, 6th, 7th, 15th, 17th, 24th, 25th and on September 6th 2020 (identification of lines from PlotSpectra)
Nova Cas 2020 on August 5th, 6th, 7th, 15th, 17th, 24th, 25th and on September 6th 2020 (identification of lines from PlotSpectra)
The relative intensities of the Balmer lines continue to increase and more particularly that of the Halpha line. Those of [OI] lines at 6300A and 6364A have clearly increased since August 25. The lines of FeII remain evident.

Evolution of the Halpha line :
Halpha line on August 5th, 6th, 7th, 15th, 17th, 24th, 25th and on September 6th 2020
Halpha line on August 5th, 6th, 7th, 15th, 17th, 24th, 25th and on September 6th 2020
novacas2020_20200906_902_Christophe Boussin_Halpha.png (32.19 KiB) Viewed 6215 times
Evolution of the [OI] line :
[OI] line on August 5th, 6th, 7th, 15th, 17th, 24th, 25th and on September 6th 2020
[OI] line on August 5th, 6th, 7th, 15th, 17th, 24th, 25th and on September 6th 2020
novacas2020_20200906_902_Christophe Boussin_OI.png (36.27 KiB) Viewed 6215 times
Clear skies !

Christophe BOUSSIN

Re: Nova in Cassiopea (nova Cas 2020)

Posted: Wed Sep 09, 2020 8:41 am
by Francois Teyssier
Good coverage of this faint nova with peculiar light curve. Congratulations!
http://www.astrosurf.com/aras/Aras_Data ... as2020.htm

See also, e.g., Nova Sct 2017:
Sct2017.PNG
Sct2017.PNG (8.32 KiB) Viewed 6201 times
Interesting [OI] profile in Christian's spectrum:
novacas2020_20200905_950_cbuil.png
novacas2020_20200905_950_cbuil.png (16.55 KiB) Viewed 6201 times
with a narrow component (~30 km/s) at the rest wavelength
while the whole line have a FWHM ~ 570 km/s, slightly displaced to shorter wavelengths by ~ 55 km/s

Comparison with Joan's spectrum:
novacas2020_20200905_950_cbuil2.png
novacas2020_20200905_950_cbuil2.png (26.89 KiB) Viewed 6201 times
Let's go on the good work!

François

Re: Nova in Cassiopea (nova Cas 2020)

Posted: Wed Sep 09, 2020 10:44 am
by David Boyd
This spectrum of the nova recorded on 8th Sept with a LISA and C11 shows a strong broad emission line centred on 7115 A which I cannot identify in the list of nova emission lines in Williams AJ 144 (2012). Also, is my identification of the broad C II line at 7235 A correct?
novacas2020_20200908_888_D_Boyd.png
novacas2020_20200908_888_D_Boyd.png (42.52 KiB) Viewed 6191 times
David

Re: Nova in Cassiopea (nova Cas 2020)

Posted: Thu Sep 10, 2020 8:58 pm
by Peter Somogyi
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 ratio compared to Ca II IRT, and widened.
Having more spectra on the process queue, related to previous 2 comments...
Peter

Re: Nova in Cassiopea (nova Cas 2020)

Posted: Fri Sep 11, 2020 11:55 pm
by Christophe Boussin
Hello all,
For information, 2 new telegrams about the spectroscopy of Nova Cas 2020 in the visible :
http://www.astronomerstelegram.org/?read=14004
and in the near infrared (persistence of carbon monoxide emission) :
http://www.astronomerstelegram.org/?read=14006
Christophe BOUSSIN