Nova in Cassiopea (nova Cas 2020)

[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

[Joan Guarro Flo]

Hello,

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

Cheers, J. Guarro.

[Francois Teyssier]

Another classical nova with oscillation at maximum luminosity.

NovaCas2020.PNG (6.16 KiB) Viewed 8091 times

Daily monitoring is recommended

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

François

[Christian Buil]

Close look of Halpha line the 5.9 September, extracted from eShel(2) spectrum at R=12000 (T250 telescope + ASI6200MM camera):



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



Christian Buil

[Christophe Boussin]

Hello all,

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

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

Christophe BOUSSIN

[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

_novacas2020_20200906_902_Christophe Boussin_3750_7565.png (77.91 KiB) Viewed 8003 times

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

novacas2020_20200906_902_Christophe Boussin_Halpha.png (32.19 KiB) Viewed 8003 times

Evolution of the [OI] line :

[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 8003 times

Clear skies !

Christophe BOUSSIN

[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 (8.32 KiB) Viewed 7989 times

Interesting [OI] profile in Christian's spectrum:

novacas2020_20200905_950_cbuil.png (16.55 KiB) Viewed 7989 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 (26.89 KiB) Viewed 7989 times

Let's go on the good work!

François

[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 (42.52 KiB) Viewed 7979 times

David

[Peter Somogyi]

Quick update, for those who can follow O I 7772 or 8446:

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):

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

[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