PNV J20233073+2046041 mag 6.8

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Re: PNV J20233073+2046041 mag 6.8

Postby Francois Teyssier » Thu Aug 22, 2013 8:55 pm

Beau temps en Normandie

Le spectre du jour :

_novadel2013_20130822_842_fteyssier.png
_novadel2013_20130822_842_fteyssier.png (4.38 KiB) Viewed 3933 times


François
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Re: PNV J20233073+2046041 mag 6.8

Postby Olivier Thizy » Thu Aug 22, 2013 9:50 pm

Hello,


weather is turning bad but I had 30min window on the nova and I was able to get hd196544 as reference. SO I got my 9th night spectrum of the nova... :-)

Equipment is still the small Televue 85mm refractor and the Alpy 600 spectrograph with Atik Titan for guiding and Atik 460ex for acquisition. Spectroscopy is great because it can be done during full Moon and with foggy skies:

web_IMG_7190 Alpy600-TV85 moon and clouds.jpg
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Here is the graph with one spectrum per night since the beginning on august 14th:

nova.jpg
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Halpha is actually continuing to grow drastically! :-)


Cordialement,
Olivier Thizy
Vous ne verrez plus des étoiles comme avant !
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Re: PNV J20233073+2046041 mag 6.8

Postby Christian Buil » Thu Aug 22, 2013 10:57 pm

La comparaison de l'aspect de la raie Halpha entre hier et cette nuit.

Je lui trouve un air de famille de plus en plus prononcée avec
la nova Sagittari N°4 de 2012 :

http://www.astrosurf.com/buil/nova_sgr2012_4/obs.htm

Christian
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Re: PNV J20233073+2046041 mag 6.8

Postby Christian Buil » Fri Aug 23, 2013 1:20 am

This night (22-23) blue region of nova with eShel (order from #51 to #55) i.e. spectral range 4050-4450 A :

Image

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Re: PNV J20233073+2046041 mag 6.8

Postby Robin Leadbeater » Fri Aug 23, 2013 2:23 am

Here is the Ca II HK region (3770-4120A) with LHIRES 1200l/mm for 20130822.863

Cheers
Robin
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Re: PNV J20233073+2046041 mag 6.8

Postby Martin Dubs » Fri Aug 23, 2013 8:45 am

Hello,

I did not want to miss this Nova. Here is my contribution to the campaign:
_novadel_20130821_872.jpg
_novadel_20130821_872.jpg (61.59 KiB) Viewed 3917 times

Special about this spectrum is, that it was recorded with my home built echelle, not as an echelle spectrum, but in the low resolution mode, bypassing the echelle grating. My echelle suffers from different drawbacks, poor grating efficiency, low camera efficiency, poor fiber transmission, small telescope (Vixen VC200), in addition hazy sky, so I had to switch to the low resolution mode (R = 650).
A comparison with a spectrum taken by Olivier Thizy from th ARAS database shows good agreement:
novaDel Thizy.jpg
novaDel Thizy.jpg (61.13 KiB) Viewed 3917 times

It took me a while to figure out calibration (with A HgAr lamp) and instrument response (with a fiber flat), but it looks I managed it after a few headaches.
I hope to contribute some more spectra as soon as my LISA gets back from France.

Regards, Martin
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Re: PNV J20233073+2046041 mag 6.8

Postby Eric Barbotin » Fri Aug 23, 2013 9:33 am

I'm currently processing the last night spectras.
H beta is still growing. We can clearly see that new spectral lines are coming on the red side of each larges emission lines ; this becomes more clearer this evening. By the way, H beta shows a new profile at the top. Christian Buil shows the same with is last spectras.

I have 35 images of 300 sec each around H beta and a sequence around CaII h&K. I've got some job for the rest of the day...

Après quelque peu de sommeil, je traite les images de la nuit.
On voit que H beta grandit toujours un peu. De plus on constate sans équivoque le développement d'un pic sur le côté rouge des raies en émission. C'était à peine discernable il y a deux jours, mieux la nuit d'avant, mais cette nuit, c'est très très net.
D'autre part, le somment de H beta tendrait à s'évaser un peu. Cela est très net aussi sur les images de Christian Buil.

Allez, courage, j'ai 35 poses de 300 sec à traiter en H béta ; la calibration à faire sur CaII h&k et la réduction dans cette longueur d'onde. Ma journée va être occupée (et en plus il faudrait que je passe la tondeuse dans le jardin...)
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nova_Del20130821_838.png
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nova_Del20130820_847.png
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Re: PNV J20233073+2046041 mag 6.8

Postby Christian Buil » Fri Aug 23, 2013 9:58 am

Eric, it's a great spectroscopy with a high signal to noise ratio !

Martin, welcome to the campaign. Your comparison with Olivier data is
impressive and your spectrograph work very well. You are a fine
instrument constructor. I appreciate very well and I love.

Christian
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Re: PNV J20233073+2046041 mag 6.8

Postby Olivier GARDE » Fri Aug 23, 2013 10:06 am

Here's some graph to compare data from 22th to 23th
H alpha line is always growing up and some change between 4200 to 4300 Å.

Image

range from 4267 to 4353 Å (order 52 of the Eshel)
Image

range from 4185 to 4270 Å (order 53 of the eshel)
Image
LHIRES III #5, LISA, e-Shel, C14, RC400 Astrosib, AP1600
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Re: PNV J20233073+2046041 mag 6.8

Postby Benjamin Mauclaire » Fri Aug 23, 2013 2:30 pm

Hello Olivier,

L'eshell c puissant et tu sais bien utiliser cela.
Neanmoins, pour pouvoir comparer des profils rigoureusement il est prudent des les rescaler : mise a l'echelle du continuum a 1 pour une meme longueur d'onde.

Benji
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