Alert! Nova Cas 2021 mag 9

Alerts and Monitoring of Novae

Re: Alert! Nova Cas 2021 mag 9

Postby Francois Teyssier » Tue Mar 30, 2021 11:56 am

Another peculliar nova

Plateau at maximal luminosity, no jitters or oscillations at the date.

NovaCas2021_LC_2021-03-30.png
NovaCas2021_LC_2021-03-30.png (28.69 KiB) Viewed 1301 times


The various emission lines remain strong.
He I lines persist.

Variation of a few lines from Echelle spectra secured by Joan Guarro and François Teyssier at the remote station SMM-SP and Olivier Garde (2021-03-28.145)

NovaCas2021_2021-03-28_Halpha6563.png
NovaCas2021_2021-03-28_Halpha6563.png (28.02 KiB) Viewed 1301 times


NovaCas2021_2021-03-29_HeI5876.png
NovaCas2021_2021-03-29_HeI5876.png (28.06 KiB) Viewed 1301 times


Note the very fast changes in the absorption profiles in less than 1 day (spectra obtained on March, 28th.



Echelle spectrum secured by F. Teyssier with the remote station SMM-SP using the new echelle spectrograph designed and build by Joan Guarro:

asdb_NovaCas2021_20210329_838.png
asdb_NovaCas2021_20210329_838.png (19.66 KiB) Viewed 1301 times


It works well!
More details about this new wonderful tool: http://spectro-aras.com/forum/viewtopic.php?f=8&t=1767&start=40


The various identification of lines are correct.
Note that even in low resolution spectra one can add Si II

novacas2021_20210329_838_F. Teyssier.png
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Re: Alert! Nova Cas 2021 mag 9

Postby Christian Buil » Wed Mar 31, 2021 3:10 am

Visible part of the spectrum for Mach 29.138 (Star'Ex 600 lines/mm spectrograph + Newton 200 mm):

Image

Image

Red and infrared spectrum for March 30.120 (Star'Ex 600 lines/mm - composite of two spectra):

Image

Image

Detail of Pashen series:

Image

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Re: Alert! Nova Cas 2021 mag 9

Postby Christophe Boussin » Fri Apr 02, 2021 5:42 pm

Hello all,

Here is my update for the monitoring of the nova Cas 2021.
The following spectra were obtained with my Alpy 600, respectively, the 29th of March at 20 h 00 TU (resolution of 528, JJ = 2459303.3334) with an acquisition time of 36 min (12 x 180s) and the 30th of March at 20 h 01 TU (resolution of 518, JJ = 2459304.334) with an acquisition time of 39 min (13 x 180s) :

_novacas2021_20210329_833_Christophe Boussin_3600_7395.png
Nova Cas 2021 on March 29th, 2021
_novacas2021_20210329_833_Christophe Boussin_3600_7395.png (96.74 KiB) Viewed 1189 times


_novacas2021_20210330_834_Christophe Boussin_3600_7395.png
Nova Cas 2021 on March 30th, 2021
_novacas2021_20210330_834_Christophe Boussin_3600_7395.png (93.97 KiB) Viewed 1189 times


Evolution of the Nova Cas 2021 from March 20 to 30 with the addition of the identification of the Si II lines (see previous post by François Teyssier) :

novacas2021_20210330_834_Christophe Boussin.png
Nova Cas 2021 on March 20th, 23th, 24th, 29th and 30th 2021 (identification of some lines from PlotSpectra)


Evolution of the Halpha line : the changes are obvious even at low resolution !

novacas2021_20210330_834_Christophe Boussin_Halpha.png
Halpha line on March 20th, 23th, 24th, 29th and 30th 2021


Clear skies,

Christophe BOUSSIN
CBO (Newton 200 F/5 / Alpy600 / Atik 314L+ / Atik Titan) @ ARAS database
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Re: Alert! Nova Cas 2021 mag 9

Postby Christian Buil » Fri Apr 02, 2021 11:33 pm

A "far" IR spectrum taken by using Star'Ex + 300 lines/mm grating blazed at wavelength 1 micron + ASI294MM camera :

Image

The Pashen line # 8 in emission at 10049 A is easily now detected. For the fun, the Vega spectrum up to Pashen #7 line at 10938 A :

Image

A possible record in amateur astronomy ?

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Re: Alert! Nova Cas 2021 mag 9

Postby etienne bertrand » Sat Apr 03, 2021 10:55 am

Superbe !
C'est Paschen gamma ? Mais étons encore en astronomie amateur :?: :?: :?: :D :D

Voir si des caméras IR serait adaptées pour cet usage ?
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Re: Alert! Nova Cas 2021 mag 9

Postby Joan Guarro Flo » Sun Apr 04, 2021 4:08 pm

Hello,

This is Nova Cas 2021 last night from RSMM.

J. Guarro.
Attachments
NOVACAS2021_20210403.jpg
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Re: Alert! Nova Cas 2021 mag 9

Postby Matthieu Le Lain » Mon Apr 05, 2021 10:38 pm

Hi all,

Very interesting all this data about the Nova and his evolution. Good follow Christophe
Here is a new spectrum of the Nova Cas 2021 with an Alpy600 the 4th of april, on C8 f/6.3 - Atik460Ex - 16 x 90s exp.

novacas2021_20210404_958_mll_cont.png


NovaCas2021_20210404231327.png
NovaCas2021_20210404231327.png (28.43 KiB) Viewed 1030 times


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Re: Alert! Nova Cas 2021 mag 9

Postby Francois Teyssier » Wed Apr 07, 2021 5:57 pm

A long plateau (and no oscillations) at max.
novaLC.PNG
novaLC.PNG (188.38 KiB) Viewed 989 times


From my knowledge, it looks that the envelop remains at giant dimension (~ 1 uA as an order of magnitude) , doesn't recede (as in the case of a classical nova),
and emits a continuous wind (until the accreted material is burnt)
Of course this behavior deviates strongly from a "uniform model".
No problem, I'll have a place in Hell and good company. ;)

Of course, daily coverage is strongly recommended! Even if (and because) the variations are very faint.
Thanks in advance,

François
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Re: Alert! Nova Cas 2021 mag 9

Postby Joan Guarro Flo » Thu Apr 08, 2021 9:51 am

Hello,

That is Nova Cas 2021 two nights comparison, it seems there are a recurrent tendency to come back to a Halpha "P Cyg" situation.

Regards, J. Guarro.
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NOVACAS2021_20210403-06.jpg
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Re: Alert! Nova Cas 2021 mag 9

Postby Christophe Boussin » Thu Apr 08, 2021 4:10 pm

Hello all,

Thank you Matthieu, I also hope that you will be able to follow the evolution of this nova and make a presentation of it on your website stellartrip.net ;) !

Here is my new update for the monitoring of the nova Cas 2021.
The following spectra were obtained with my Alpy 600 :

the 31th of March at 19 h 53 TU (resolution of 528, JJ = 2459305.3286) with an acquisition time of 39 min (13 x 180s)
_novacas2021_20210331_829_Christophe Boussin_3600_7395.png
Nova Cas 2021 on March 31th, 2021
_novacas2021_20210331_829_Christophe Boussin_3600_7395.png (92.03 KiB) Viewed 923 times


the 1st of April at 20 h 10 TU (resolution of 515, JJ = 2459306.3406) with an acquisition time of 35 min (7 x 300s) :
_novacas2021_20210401_841_Christophe Boussin_3600_7395.png
Nova Cas 2021 on April 1st, 2021
_novacas2021_20210401_841_Christophe Boussin_3600_7395.png (103.71 KiB) Viewed 923 times


the 2nd of April at 19 h 58 TU (resolution of 522, JJ = 2459307.3318) with an acquisition time of 39 min (13 x 180s) :
_novacas2021_20210402_832_Christophe Boussin_3600_7395.png
Nova Cas 2021 on April 2nd, 2021
_novacas2021_20210402_832_Christophe Boussin_3600_7395.png (91.7 KiB) Viewed 923 times


the 3rd of April at 20 h 05 TU (resolution of 523, JJ = 2459308.3365) with an acquisition time of 42 min (14 x 180s) :
_novacas2021_20210403_837_Christophe Boussin_3600_7395.png
Nova Cas 2021 on April 3rd, 2021
_novacas2021_20210403_837_Christophe Boussin_3600_7395.png (92.43 KiB) Viewed 923 times


the 4th of April at 20 h 09 TU (resolution of 526, JJ = 2459309.3394) with an acquisition time of 39 min (13 x 180s) :
_novacas2021_20210404_839_Christophe Boussin_3600_7395.png
Nova Cas 2021 on April 4th, 2021
_novacas2021_20210404_839_Christophe Boussin_3600_7395.png (93.64 KiB) Viewed 923 times


Evolution of the Nova Cas 2021 from March 20 to April 4 :
novacas2021_20210404_839_Christophe Boussin.png
Nova Cas 2021 on March 20th, 23th, 24th, 29th, 30th, 31th and on April 1st, 2nd, 3rd and 4th 2021 (identification of some lines from PlotSpectra)


François, thank you for these informations !
I note that the general appearance of the spectrum remains the same over the days with variations mainly visible on the Halpha line.

Evolution of the Halpha line :
novacas2021_20210404_839_Christophe Boussin_Halpha_vitesse.png
Halpha line on March 20th, 23th, 24th, 29th, 30th, 31th and on April 1st, 2nd, 3rd and 4th 2021
novacas2021_20210404_839_Christophe Boussin_Halpha_vitesse.png (43.52 KiB) Viewed 923 times


Joan, I agree the P Cyg profile is once again clearly visible even at low resolution !

novacas2021_20210404_839_Christophe Boussin_Halpha_vitesse_zoom_legende.png
Halpha line (zoom) on March 20th, 23th, 24th, 29th, 30th, 31th and on April 1st, 2nd, 3rd and 4th 2021
novacas2021_20210404_839_Christophe Boussin_Halpha_vitesse_zoom_legende.png (53.88 KiB) Viewed 923 times


The Si II lines at 6347 and 6371A are still clearly visible.
novacas2021_20210404_839_Christophe Boussin_SiII_6347_6371.png
Si II lines at 6347 and 6371A on March 20th, 23th, 24th, 29th, 30th, 31th and on April 1st, 2nd, 3rd and 4th 2021


And, it also seems to me that 2 other lines of Si II at 5958 and 5979A are visible in the spectrum of the nova... ?
novacas2021_20210404_839_Christophe Boussin_SiII_5958_5979.png
Probable identification of Si II lines at 5958 and 5979A on March 20th, 23th, 24th, 29th, 30th, 31th and on April 1st, 2nd, 3rd and 4th 2021


Unfortunately, the weather did not allow me to continue this daily monitoring...
I hope others spectroscopists will have better luck !!

Clear skies to all !!

Christophe BOUSSIN
CBO (Newton 200 F/5 / Alpy600 / Atik 314L+ / Atik Titan) @ ARAS database
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