spectro-aras.com

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

Hello,

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

Cheers, J. Guarro.

Another classical nova with oscillation at maximum luminosity.
Daily monitoring is recommended

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

François

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

Hello all,

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

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

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 :
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 : Evolution of the [OI] line : Clear skies !

Christophe BOUSSIN

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: Interesting [OI] profile in Christian's spectrum:
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: Let's go on the good work!

François

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?
David

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

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