PNV J20233073+2046041 mag 6.8

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Re: PNV J20233073+2046041 mag 6.8

Postby Mike Potter » Fri Oct 04, 2013 1:00 am

Is there a particular address to which I need to send spectra for inclusion in the database? I'm guessing that since these would be my first contributions that someone would want to validate the format, make sure I got the keywords in the header correct and so on. I did read the "BeSS FITS Definition" pdf document - I just don't know where or to whom I should send the spectra. Here's three nights of data in the 4500-4700 region using the LHiRes_2400 and a C14 from here in nicely polluted Baltimore skies!

Thanks,
Mike Potter
Baltimore, MD
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Oct.jpg
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Re: PNV J20233073+2046041 mag 6.8

Postby Jacques Montier » Fri Oct 04, 2013 12:40 pm

Hello Mike,

You have to send your spectra to François Teyssier here :
francoismathieu.teyssier@bbox.fr

Best regards,
--
Jacques
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Re: PNV J20233073+2046041 mag 6.8

Postby Christian Buil » Sun Oct 06, 2013 10:54 pm

October 6.8 observation compared to October 1.8 observation (in flux unit, log scale along intensity axis) :

Image

The spectrophotometric actual measured magnitudes (Alpy + 250 microns slit):
6.906/10/2013

B = 9.824
V = 9.782
R = 8.323

Magnitude plot:

Image

Christian
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Re: PNV J20233073+2046041 mag 6.8

Postby Christian Buil » Tue Oct 08, 2013 12:21 am

Un spectre échelle fait le 7.8 / 10 / 2013 :

Image

La pose est un peu longue (22 x 300 sec), mais on voit que cet objet à la magnitude 10 est encore tout à fait
observable avec ce type de spectrogrographe, alors même que le télescope est relativement modeste (un C11).

Donc, faut pas continiuer à observer avec tous les instruments. Ce n'est pas une étoile de magnitude 10, 11, voir 12
qui va nous faire peur, non mais ;)

Image

Un détail autour de Hbeta (noter que c'est étalonné en flux grace à un spectre Alpy 600 fait en parallèle).

Les magnitudes du jour (7.783/10/2013) :

B = 9.919
V = 9.885
R = 8.479

Image

Christian
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Re: PNV J20233073+2046041 mag 6.8

Postby Mike Potter » Tue Oct 08, 2013 5:35 am

We've had a nice stretch of mostly clear nights lately so I've been able to get spectra on seven of the past eleven nights. Nice triple peaks on both N III 4641 and He II 4686. Just a very crude measurement of the blue and red-shifted peaks compared to the center gives an expansion velocity of about 550 km/s. Sadly the nova is getting fainter and I'm not likely to be able to get many (or any?) more spectra at this resolution. Not only that but I only have about three hours from the time it gets dark until the time the nova passes behind the maple tree in my back yard.
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Re: PNV J20233073+2046041 mag 6.8

Postby Christian Buil » Sat Oct 12, 2013 3:50 pm

Change of spectrum aspect between 7 Oct and 11 Oct in flux unit (and log scale) - Alpy 600 spectrograph :

Image

My most recent spectrophometric measure 11.892 Oct 2013:

B = 10.254
V = 10.303
R = 8.915

For the first time the nova is most luminuous in B than in V.

Magnitude plot:

Image

Et une fois n'est pas coutume une image de la nova réalisé par Pierre Thierry pas très loin
de Toulouse avec un télescope de 160 mm f/4 + APN (6 octobre 2013):

Image

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Re: PNV J20233073+2046041 mag 6.8

Postby Eric Barbotin » Sat Oct 12, 2013 6:54 pm

Hello,

Mon premier spectre de la nova del2013 en H alpha.
Pas forcément aussi bon que je l'aurais souhaité : quelques nuages et une focalisation pas top ; peut être même en fait une collimation un peu déréglée.
Comme Christian le disait, je ne pensais pas faire des spectres au LHiReS sur une étoile de V=10, même si c'est une étoile un peu spéciale, avec mon petit 225 ! Mais là, les autres longueurs d'onde deviennent impossible pour moi ; H béta peut être ; à voir...
La prévision météo n'a pas l'air trop mauvaise sur la Charente pour la semaine prochaine ; je vais réessayer...

---------------------------------------------
My first contribution in H alpha.
the telescope was not very well focused and the clouds passed from time to time so the spectra isn't as good as it should be.
But I had never thought to make spectra on a 10 mag star few days ago with such a small telescope (225mm diameter).
But now it seems that other wavelengths are impossible for me right now ; the flux is too weak.
I'll try next week to do some news spectras if the weather is as good as the forecast says.


Eric
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Re: PNV J20233073+2046041 mag 6.8

Postby Paolo Berardi » Wed Oct 16, 2013 4:05 pm

In the latest spectra it seems to me that all major emission lines present a blue-shifted peak not visible before. Could be the particular shape due to a new optical trasparence level in the ejecta?

Image

Ciao
Paolo
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Re: PNV J20233073+2046041 mag 6.8

Postby James Edlin » Sat Oct 19, 2013 7:15 am

I have been following the nova as often as weather permits. The blue wing of hydrogen lines are evolving rapidly with marked blue shift. This was also noticed by Paolo. See my quick graphs from spectra over last 2 weeks. Very interesting changes!! These are from LISA spectrograph.

Jim
Attachments
Line evolution 9-25 to 10-19.jpg
H-beta through H-delta
Ha changes Nova Del 9-25 to 10-19.jpg
H-alpha line
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Re: PNV J20233073+2046041 mag 6.8

Postby Olivier GARDE » Sat Oct 19, 2013 8:39 am

J'ai tenté de faire encore un spectre haute résolution avec l'eshel hier soir en posant 3H sur des poses unitaires de 20 minutes, mais la partie bleue du spectre est très bruité.

Voici une comparaison de divers longueurs d'onde à un mois d'écart (20 septembre et 18 octobre)

I tried to take another spectrum with Eshel yesterday with 3H exposures (10 exposures of 1200s each), but the blue part of the spectrum is very noisy.

Here is a comparison of various wavelengths to one month apart (20 September and 18 October)
H Alpha
Image
H Beta
Image
Ordre 45 (4920 to 5038 Å)
Image
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