PNV J20233073+2046041 mag 6.8

[Olivier GARDE]

I confirm Terry's observation.
Very strong Halpha line in emission (no more absorption line)
Very strong HBeta

And some others lines between H Alpha and HBeta.
I reduce my exposure time from 200s down to 180s.

[Francois Teyssier]

H alpha saturée à 30 secondes de poses
Je dois réduire à 20 secondes.
Il va bientôt falloir diaphragmer
François

[Francois Teyssier]

Impressionnat cette augmentation de l'intensité relative de H alpha
Le spectre de cette nuit

_novadel2013_20130820_848_fteyssier.png (5.06 KiB) Viewed 12951 times

Comparison with Terry's spectrum acquired only 8 hours before

NDel.png (6.37 KiB) Viewed 12951 times

François

[Olivier Thizy]

Bonjour,


la petite lulu de 85mm est en route sur la nova. Effectivement, j'ai du réduire le temps de pose de 120sec à 90s pour ne pas saturer; et Halpha est vraiment en forte augmentation. Voici le graphe des 7 spectres (un par nuite depuis le 14-août); le spectre du haut est le dernier pris il y a quelques minutes:

Little 85mm refractor is active on the nova at the moment. I had to reduce exposure fro 120s last nigth to 90s now to avoid saturating. Halpha is growing. Here is the graph with 7 spectra (one per night since aug-14); top spectrum is the lat one from few minutes ago:

nova.jpg (150.56 KiB) Viewed 12943 times

and a pic of the equipment by night, under the Moonlight:

web_IMG_7177 TV85-Alpy by night.jpg (119.3 KiB) Viewed 12925 times

Cordialement,
Olivier Thizy
Vous ne verrez plus des étoiles comme avant !
http://www.shelyak.com/en/

[Olivier GARDE]

J'ai lancé des acquisitions avec l'eshel depuis le début de la nuit jusqu'à la fin et je viens de faire le retournement de monture.
Donc demain matin, j'aurais environs 140 images de 180s chacune, de quoi faire une belle animation de tout les ordres....

[Olivier Thizy]

Hello,


here are some more information from Steve Shore on the nova:

We have a gamma-emitter! The result was found this morning and the
Fermi people pushed the ATel up. It's about 3-4 times fainter than
V959 Mon but that could change, it's just the start. We have two more
days of pointed observations so this will be updated. These spectra
[ndlr: from the group] are all spectacular.

It is now vitally important that anyone who can cover the 4200-4300 and
3800-4000 A region do so. High or low resolution (well, not too low).
The CN -- if it appears -- will come around in this next week.

The Na I velocities now seem to agree with the hydrogen from the
interstellar medium (attached) so we can estimate the minimum distance
(likely 3 kpc) and maximum (likely 4 kpc). It's not in the plane but
not too far above it, and the UBV luminosity is about the same as the
maximum we would expect for a nova at this stage.

The group of lines at the right of Hbeta are the Fe II lines at 4921, 5018,
5269 and a lot of others (these are connected to the ground states in the
2000-3000 A region of the spectrum)

More to come...


Cordialement,
Olivier Thizy

[Thierry Lemoult]

Génial Olivier.
De mon cote, j'ai deux séries de 15x120s et je viens également de retourner la monture après avoir observé la référence HD196544.
Apres chaque séquence de 15x120s sur la cible, je fait des séries de calibration Eshel. Cela risque de faire dévier l'autoguidage.. mais bon je tente le coup. Les autres soir j'étais la pour rattraper le coup..
Déjà les deux premieres series ici: La raie H alpha monte a 5x le continus ! Et je crois la voire monter entre les deux poses première pose de ce soir. http://perso.crans.org/lemoult/spectro/ ... a-del.html

Thierry

[Ernst Pollmann]

Here the compilation of high resolution spectra, taken with LHRES-III of last night.
The Halpha emission did increase clearly. Also the absorption component is filled up with emission.

Ernst Pollmann
----------------------------------------
Active Spectroscopy in Astronomy
http://www.astrospectroscopy.de
http://www.astronomie.de/astronomische-fachgebiete

[Olivier GARDE]

Animation of 124 spectras from 19H41 to 2H20 TU, order 34 (HAlpha line) with an eshel spectro



The HAlpha line is growing up ...

Near the end of the night, the telescope was pointing behind a tree, that's why there are more noise in the spectrum.

[Olivier GARDE]

Here's the evolution of the nova since 7 days (Ha region)


And a graph estimate the velocity of the nova on the same periode.