TCP J04291884+4354232 possible nova mag 10.2

Alerts and Monitoring of Novae
Christophe Boussin
Posts: 171
Joined: Sun Aug 21, 2016 6:04 pm

Re: TCP J04291884+4354232 possible nova mag 10.2

Post by Christophe Boussin »

Francois : Merci pour cette confirmation !

Paolo : Thank you so much for your comment !!
Very interesting to see the similar shape of line [OI] 6364 at high resolution !
Have you noticed any change in the position of the blue shifted peak for lines [OI] 6300 or 6364 over the last days ?

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
Paolo Berardi
Posts: 578
Joined: Thu Sep 29, 2011 10:51 pm

Re: TCP J04291884+4354232 possible nova mag 10.2

Post by Paolo Berardi »

Hi Christophe, only the 6364 A line is included in my previous spectra (yesterday I rotate the grating, now I have also 6300 line!). There is a lot of noise for the oxygen line but I think I see only a gradual intensity increase from January 13. You can try with my spectra on ARAS DB. I just sent the last one (Jan 18) to François to be included in the database (if ok).

Image


Changes in ~48 hours

Image


The radial velocity of the lines in the Jan 18 spectrum.

Image

Clear sky!
Paolo
Francois Teyssier
Posts: 1533
Joined: Fri Sep 23, 2011 1:01 pm
Location: Rouen
Contact:

Re: TCP J04291884+4354232 possible nova mag 10.2

Post by Francois Teyssier »

Great result on such a faint star, Paolo. Congratulations.
Do tou think that it would be possible to get the OI 8448 line?
See tou!
Paolo Berardi
Posts: 578
Joined: Thu Sep 29, 2011 10:51 pm

Re: TCP J04291884+4354232 possible nova mag 10.2

Post by Paolo Berardi »

I could try François, but the overall efficiency is low in those wavelengths. Weather forecast says next Tuesday could be the first useful night. I hope the nova brightness will not be decreased too much. Looking at a single 960 sec frame would have to make clear whether to continue or return to h-alpha (or change target!).

I'll let you know!

Paolo
etienne bertrand
Posts: 1040
Joined: Mon Aug 31, 2015 11:26 am

Re: TCP J04291884+4354232 possible nova mag 10.2

Post by etienne bertrand »

Hello Paolo,
What CCD do you use ? Bin2x2 ?
Paolo Berardi
Posts: 578
Joined: Thu Sep 29, 2011 10:51 pm

Re: TCP J04291884+4354232 possible nova mag 10.2

Post by Paolo Berardi »

Hi Etienne,

yes, binning 2x2. My camera is the SXVR-H694 model (Sony ICX694ALG sensor).

Paolo
Frederic Pastor
Posts: 23
Joined: Wed Jan 22, 2020 4:57 pm

Re: TCP J04291884+4354232 possible nova mag 10.2

Post by Frederic Pastor »

Hi all,

Here is my spectra taken last night, the 19th, with an Alpy 600 and a Newton 250mm. Based on 10 pic of 600 seconds each.
Nova Per2020 19 Jan 2020
Nova Per2020 19 Jan 2020
Nova Per2020 19012021 Fred Pastor.jpg (56.03 KiB) Viewed 5249 times
Despite the strong intensity of the Halpha, we can't see the absorption at the top. Guess the limit of the low resolution (I obtained a resolution of 490).Or maybe I should have taken much more than 10 pictures when I see the nice spectra of Paolo, at the semae period. Below the Halpha in detail:
close up Halpha
close up Halpha
close up Halpha.jpg (47.86 KiB) Viewed 5249 times
Cheers

Fred
Paolo Berardi
Posts: 578
Joined: Thu Sep 29, 2011 10:51 pm

Re: TCP J04291884+4354232 possible nova mag 10.2

Post by Paolo Berardi »

Nice spectrum Frederic!

I think the lack of double-peaked h-alpha line is just a matter of resolving power. See the experiment below...

The Ne-Ar lamp spectrum with Lhires III and 1200 l/mm grating

Image

By attempts, I applied a gaussian filter to this profile so that the FWHM of lamp lines was around 13 Angstrom to simulate a R=500 spectrum (this is an approximation).

Image

Applying the same filtering to the nova spectrum I obtained an h-alpha profile very similar to yours.

Image

The "bump" on the right is just a bit noticeable but, given the evolution of line between Jan 16 and 18 (see my previous post), maybe the red peak was even lower on the night of your obervation.

Clear sky!
Paolo
etienne bertrand
Posts: 1040
Joined: Mon Aug 31, 2015 11:26 am

Re: TCP J04291884+4354232 possible nova mag 10.2

Post by etienne bertrand »

With my Alpy600 is see a double pics in all the H-Balmer line.

Frederic i think your Alpy is not at the top of resolution. you have bin2x2 or 1x1 ? What CCD ?

You can compare with spectra in ARAS BASE : http://www.astrosurf.com/aras/Aras_Data ... er2020.htm
Attachments
asdb_NovaPer2020_20210118_974.png
asdb_NovaPer2020_20210118_974.png (14.81 KiB) Viewed 5190 times
Paolo Berardi
Posts: 578
Joined: Thu Sep 29, 2011 10:51 pm

Re: TCP J04291884+4354232 possible nova mag 10.2

Post by Paolo Berardi »

I agree, the Frederic's Alpy 600 can do more, surely. Among the causes, undersampling but it could also be due to a slight defocusing of spectrum on the focal plane.

Paolo
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