Alert! Nova Cas 2021 mag 9
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Re: Alert! Nova Cas 2021 mag 9
Hello Christophe, all,
Yes i've seen too, but i'm not sure, i said myself than perhaps it's probably only noise ? Which lines did you think particulary ?
Here is a new spectrum with an alpy600 with more exp., to seen a global difference i make a comparison of the two spectra and i tried to identify really distincts lines with this new spectrum.
Matthieu
Yes i've seen too, but i'm not sure, i said myself than perhaps it's probably only noise ? Which lines did you think particulary ?
Here is a new spectrum with an alpy600 with more exp., to seen a global difference i make a comparison of the two spectra and i tried to identify really distincts lines with this new spectrum.
Matthieu
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Re: Alert! Nova Cas 2021 mag 9
Hello all,
Hi Joan,
Thanks for your comment !
The monitoring of the details visible in the Halpha line profile of this nova is really exciting: we need an expert to understand their evolution !
It's also very interesting to see the parallel evolution of the Halpha and HeI 6678 A lines you mention : I look forward to seeing your next echelle spectrum with your remarkable Nou T spectrograph !!
Hi Matthieu,
To try to understand the origin of these details and whether they are noise or not, it seems to me that you could look at the individual 1D spectra that are generated in ISIS (@pro1.fit, @pro2.fit, @pro3.fit, ...) for the final 1D spectrum processing.
Are these details visible on each of them ?
I was thinking, for example, of the FeII lines at 4923, 5018 and 5169 A and, in particular, of the SiII lines at 6347 and 6371 A. The latter seem to be well visible in your spectrum of August 26 !
As usual, I continue the monitoring of the Halpha line of the Nova Cas 2021 and there is, again, some change since August 27 !
So, here is my new comparison between my two last spectra of the Halpha line of Nova Cas 2021 at high resolution on August 31 at 22 h 02 TU (resolution of 19064, JJ = 2459458.4182, 9 x 600s) and on September 2 at 21 h 55 TU (resolution of 18580, JJ = 2459460.4134, 12 x 600s) obtained with my LHIRES III (grating of 2400 lines / mm) and the previous ones in August :
Since August 31, a peak located at + 785 km/s emerges on the profile of the Halpha line (it seems to be already visible on the spectrum of August 27).
On the spectrum of September 2, the evolution of the peak is particularly obvious !
(Johnson V : green squares) Clear skies to all !!
Christophe BOUSSIN
Hi Joan,
Thanks for your comment !
The monitoring of the details visible in the Halpha line profile of this nova is really exciting: we need an expert to understand their evolution !
It's also very interesting to see the parallel evolution of the Halpha and HeI 6678 A lines you mention : I look forward to seeing your next echelle spectrum with your remarkable Nou T spectrograph !!
Hi Matthieu,
To try to understand the origin of these details and whether they are noise or not, it seems to me that you could look at the individual 1D spectra that are generated in ISIS (@pro1.fit, @pro2.fit, @pro3.fit, ...) for the final 1D spectrum processing.
Are these details visible on each of them ?
I was thinking, for example, of the FeII lines at 4923, 5018 and 5169 A and, in particular, of the SiII lines at 6347 and 6371 A. The latter seem to be well visible in your spectrum of August 26 !
As usual, I continue the monitoring of the Halpha line of the Nova Cas 2021 and there is, again, some change since August 27 !
So, here is my new comparison between my two last spectra of the Halpha line of Nova Cas 2021 at high resolution on August 31 at 22 h 02 TU (resolution of 19064, JJ = 2459458.4182, 9 x 600s) and on September 2 at 21 h 55 TU (resolution of 18580, JJ = 2459460.4134, 12 x 600s) obtained with my LHIRES III (grating of 2400 lines / mm) and the previous ones in August :
Since August 31, a peak located at + 785 km/s emerges on the profile of the Halpha line (it seems to be already visible on the spectrum of August 27).
On the spectrum of September 2, the evolution of the peak is particularly obvious !
(Johnson V : green squares) Clear skies to all !!
Christophe BOUSSIN
CBO (Newton 200 F/5 / Alpy600 / Atik 314L+ / Atik Titan + Mewlon 180 F/12 / LHIRES III 2400 / Atik 460EX / Atik 314 L+) @ ARAS database
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Re: Alert! Nova Cas 2021 mag 9
Hello,
After some few days of bad weather , I have been able to observe Nova Cas 2021 with SMM teescope.
J.Guarro.
After some few days of bad weather , I have been able to observe Nova Cas 2021 with SMM teescope.
J.Guarro.
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- novacas2021.png (21.65 KiB) Viewed 6011 times
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Re: Alert! Nova Cas 2021 mag 9
Last night observation, C11 at F7 Alpy 600 CCD 414. Still very bright, Ha line is saturating in less than one minute.
Clear skies,
Jean-Philippe
Clear skies,
Jean-Philippe
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Re: Alert! Nova Cas 2021 mag 9
Hello all,
Hi Jean-Philippe,
Yes, the Nova Cas 2021 is still very bright !
This is a great opportunity to follow it at low and high resolutions !
As I had indicated in my previous post, a peak located at about +785 km/s appeared around August 27 in the profile of the Halpha line of Nova Cas 2021.
So I followed its evolution these last days by taking 2 new high resolution spectra on September 4 at 23 h 22 TU (resolution of 19441, JJ = 2459462.4734, 5 x 600s) and on September 6 at 22 h 00 TU (resolution of 19187, JJ = 2459464.4168, 12 x 600s) with my LHIRES III (grating of 2400 lines / mm).
Here are all the spectra I got between August 27th and September 6th :
...and its animation :
We can clearly note the appearance of this peak around August 27 and its almost total disappearance around September 6....What happened then ?
Clear skies to all !!
Christophe BOUSSIN
Hi Jean-Philippe,
Yes, the Nova Cas 2021 is still very bright !
This is a great opportunity to follow it at low and high resolutions !
As I had indicated in my previous post, a peak located at about +785 km/s appeared around August 27 in the profile of the Halpha line of Nova Cas 2021.
So I followed its evolution these last days by taking 2 new high resolution spectra on September 4 at 23 h 22 TU (resolution of 19441, JJ = 2459462.4734, 5 x 600s) and on September 6 at 22 h 00 TU (resolution of 19187, JJ = 2459464.4168, 12 x 600s) with my LHIRES III (grating of 2400 lines / mm).
Here are all the spectra I got between August 27th and September 6th :
...and its animation :
We can clearly note the appearance of this peak around August 27 and its almost total disappearance around September 6....What happened then ?
Clear skies to all !!
Christophe BOUSSIN
CBO (Newton 200 F/5 / Alpy600 / Atik 314L+ / Atik Titan + Mewlon 180 F/12 / LHIRES III 2400 / Atik 460EX / Atik 314 L+) @ ARAS database
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Re: Alert! Nova Cas 2021 mag 9
Hi Christophe. Maybe some kind of inhomogeneity in the fireball ?Christophe Boussin wrote:We can clearly note the appearance of this peak around August 27 and its almost total disappearance around September 6....What happened then ?
Jp
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Re: Alert! Nova Cas 2021 mag 9
Hello,
Last night I was observing Nova Cas 2021 and I found that this star was around 6.5 magnitude.
You can see two graphics.
J.Guarro.
Last night I was observing Nova Cas 2021 and I found that this star was around 6.5 magnitude.
You can see two graphics.
J.Guarro.
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- Nova cas 2021 1.png (22.41 KiB) Viewed 5857 times
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- Nova cas 2021 2.png (19.86 KiB) Viewed 5857 times
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Re: Alert! Nova Cas 2021 mag 9
I'm sorry, the first graphic has a mistake, the star is NOVA Cas 2021.
Thanks, J. Guarro.
Thanks, J. Guarro.
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- Joined: Sun Aug 21, 2016 6:04 pm
Re: Alert! Nova Cas 2021 mag 9
Hello all,
Yes, why not !
The changes in the profile of the Halpha line are not easy to explain...
The inclination of the system, the complex shape of the ejecta and its expansion, the possible ejection of new material are all parameters to be taken into account by experts in the field. The new maximum of luminosity, which seems to be for soon, is the occasion to follow these changes in the profiles of the lines !
Yes, the brightness of the Nova is increasing again and it seems that a new maximum is for very soon !
I obtained a new high resolution spectrum of the Halpha line on September 9 at 21 h 00 TU (resolution of 18373, JJ = 2459467.3754, 7 x 600s) with my LHIRES III (grating of 2400 lines / mm) and, according to the AAVSO, the magnitude of Nova Cas 2021 was about 6.5 at that time !
Here are all the spectra I got between August 27th and September 9th :
The peak around +785 km/s has now completely disappeared and we can note the evolution of the Halpha line profile between September 6 and 9 :
Clear skies to all for the next few days !!
Christophe BOUSSIN
Hi Jean-Philippe,Jean-Philippe Nougayrede wrote :
Hi Christophe. Maybe some kind of inhomogeneity in the fireball ?
Yes, why not !
The changes in the profile of the Halpha line are not easy to explain...
The inclination of the system, the complex shape of the ejecta and its expansion, the possible ejection of new material are all parameters to be taken into account by experts in the field. The new maximum of luminosity, which seems to be for soon, is the occasion to follow these changes in the profiles of the lines !
Hi Joan,Joan Guarro Flo wrote :
Last night I was observing Nova Cas 2021 and I found that this star was around 6.5 magnitude.
Yes, the brightness of the Nova is increasing again and it seems that a new maximum is for very soon !
I obtained a new high resolution spectrum of the Halpha line on September 9 at 21 h 00 TU (resolution of 18373, JJ = 2459467.3754, 7 x 600s) with my LHIRES III (grating of 2400 lines / mm) and, according to the AAVSO, the magnitude of Nova Cas 2021 was about 6.5 at that time !
Here are all the spectra I got between August 27th and September 9th :
The peak around +785 km/s has now completely disappeared and we can note the evolution of the Halpha line profile between September 6 and 9 :
Clear skies to all for the next few days !!
Christophe BOUSSIN
CBO (Newton 200 F/5 / Alpy600 / Atik 314L+ / Atik Titan + Mewlon 180 F/12 / LHIRES III 2400 / Atik 460EX / Atik 314 L+) @ ARAS database
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- Joined: Thu Nov 03, 2011 8:50 pm
Re: Alert! Nova Cas 2021 mag 9
Hello,
It seems that Nova Cas 2021 wants explain things to us again !
Cheers, J. Guarro.
It seems that Nova Cas 2021 wants explain things to us again !
Cheers, J. Guarro.
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- Nova Cas 20211.png (20.41 KiB) Viewed 5766 times
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- Nova Cas 20212.png (23.13 KiB) Viewed 5766 times