PNV J20233073+2046041 mag 6.8

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Robin Leadbeater
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Re: PNV J20233073+2046041 mag 6.8

Post by Robin Leadbeater »

Robin Leadbeater wrote:Hi Martin,

I was typing at the same time as you :-)

You now see my method and I will look at your suggestion but I suspect we have come to very similar conclusions :-)

Cheers
Robin
Thanks for the very useful link Martin.

I see from there that my choice of wavelength (5556A) for the flux of the standard A0v star Vega (which is used to convert the Vmag to flux for comparison with the weighted mean of the target spectrum) is not ideal. A better value would be the flux at the wavelength which bisects the area under the Vmag Bessel filter curve (5450A) which is the value you quote from the reference. This only makes a small difference of ~3% but it happens (by luck really) to be in the right direction to correct the small mean error in my calculations of absolute flux relative to Christian's :) (I do not believe there is a need to compensate explicitly for the emission lines as they are already included in the Vmag passband weighted mean)

Cheers
Robin
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Olivier GARDE
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Re: PNV J20233073+2046041 mag 6.8

Post by Olivier GARDE »

"Iron age" of the nova : an animation of Fe II lines at 5169, 5198 and 5235 Å with all my spectra since august the 14th (31 spectras)
"L'age de fer" de la nova : une animation des raies du Fe II a 5169, 5198 et 5235 Å avec tout mes spectres acquis depuis le 14 Août (31 spectres)
Image
LHIRES III #5, LISA, e-Shel, C14, RC400 Astrosib, AP1600
http://o.garde.free.fr/astro/Spectro1/Bienvenue.html
Jacques Montier
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Re: PNV J20233073+2046041 mag 6.8

Post by Jacques Montier »

Bonjour,

L'acquisition de la nuit du 10 sur la raie H alpha avec le lhires 2400 + C11 F/D 6.3 + caméra QSI 683ws (binning 2x2).
Temps de pose 1672s
Résolution 14975.
_nova_del_20130910_829_Jacques_Montier.png
_nova_del_20130910_829_Jacques_Montier.png (5.01 KiB) Viewed 8403 times
Sauf erreur de ma part, ça continue de monter relativement au continuum ; comparaison sur un peu plus d'une semaine environ.
Toujours aussi spectaculaire !
nova_del_halpha_20130902_20130910.png
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Last edited by Jacques Montier on Wed Sep 11, 2013 12:52 pm, edited 2 times in total.
--
Jacques Montier
Societe d'Astronomie de Rennes
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Jacques Montier
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Re: PNV J20233073+2046041 mag 6.8

Post by Jacques Montier »

Région H beta de la nuit du 10 avec le lhires 2400 + C11 et caméra QSI 683ws en binning 2x2 (temps de pose 3623s).
Le ciel était correct en début de soirée, mais s'est peu à peu couvert de nuages pour être complètement bouché vers 1h du matin.
_nova_del_20130910_889_Jacques_Montier.png
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La calibration avec le néon (poses poussées à 60s pour faire apparaître les raies dans cette région h beta et identification des raies avec VisualSpec) semble correcte, mais la résolution s'est pas mal effondrée (8860) ; on est loin des 15000 en h alpha...
À l'inspection des raies du néon, je trouve un FWHMX d'environ 3.
Quelle peut en être la raison ?

En ce qui concerne l'évolution au cours du temps, elle semble nettement plus faible que pour la raie H alpha.
nova_del_halpha_20130902_20130910.png
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hbeta_20130902_20130910.png
hbeta_20130902_20130910.png (6.24 KiB) Viewed 8395 times
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Jacques Montier
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Francois Teyssier
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Re: PNV J20233073+2046041 mag 6.8

Post by Francois Teyssier »

Spectre calibré en flux avec la méthode 1 de Christian.
LISA Fente 100 mcm
La seule difficulté, c'est l'autoguidage
_novadel2013_20130914_888_fteyssier_flux.png
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François
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Christian Buil
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Re: PNV J20233073+2046041 mag 6.8

Post by Christian Buil »

Spectre Alpy étalonné en flux (fusion d'un spectre visible et d'uin spectre IR pris avec un filtre d'ordre).

A flux calibrated Alpy spectrum, 14.8 / 09 / 2013) (VIS + IR exposures).

Pour la date et à partir de ce spectre on déduit les magnitudes :

B = 7.630
V = 7.542
R = 6.253

Christian B
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_nova_del_2013_20130913_822_cbuil_flux.png
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Mike Potter
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Re: PNV J20233073+2046041 mag 6.8

Post by Mike Potter »

I have just finished up with participation in this summer's WR campaign - I have a C14+LHiRes. Clear skies tonight. What spectral range should I concentrate on? I'm assuming there will be lots of people at H-alpha, but maybe being a bit further west of Europe (where it seems most of the observers are) is useful? Fe lines? Going out to the observatory in a few minutes - I know this is sort of last minute. Suggestions welcome!

Thanks,

Mike Potter
Baltimore, MD
Christian Buil
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Re: PNV J20233073+2046041 mag 6.8

Post by Christian Buil »

Spectrophometric magnitudes for the Sept 15.9 (Alpy spectrograph + 230 microns slit):
(see method here http://www.astrosurf.com/buil/calibrati ... ion_en.htm )

DATE B V R

15.920 / 09 / 2013 7.791 7.737 6.397
15.982 / 09 / 2013 7.842 7.771 6.437

Attached, two days evolution on eShel flux calibrated spectra.

Christian
Attachments
_flux_comp_eshel.png
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_flux_comp_eshel_3.png
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Eric Barbotin
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Re: PNV J20233073+2046041 mag 6.8

Post by Eric Barbotin »

Une petite comparaison entre les spectres aux alentours des raies CaII H&K.
Quand bien même le signal dans le spectre du 20130915.799 soit faible du fait d'un fin voile nuageux et d'une mise au point perfectible, on note un net changements dans la raie en émission vers 3935 angström ; elle a baissé de manière importante et devient presque au niveau du continuum.
D'autre part, il semblerait que quelque chose se passe aux alentour de 4050 ; on voit un léger passage en émission alors que sur le spectre 20130903.825, la zone était plate.

Bien sûr, tout ceci reste à confirmer par les spectres à venir.

Here is a picture showing the spectras around CaII H & K.
Even though the signal in of 20130915.799 is weak due to a thin veil of clouds and a not perfectly focused setup, one can see a net change in the emission line to 3935 angstrom, that has significantly declined and is right now around the continuum level.
On the other hand, it seems that something is going on around 4050, we see a slight shift in emission while the 20130903,825 spectrum, the area was flat.

More spectras are needed to verify this


Eric
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comparaison 09-15_09-03.png
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Christian Buil
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Re: PNV J20233073+2046041 mag 6.8

Post by Christian Buil »

Evolution of nova from August 29 to Sept. 15 view by Alpy spectrograph and in absolute flux unit:

Image

Same plot, but with a log scale along Y-axis:

Image

Eric, feature evolution near 3900 A are also noticed here, but at a very different
spectral scale. Note also fast change near 5540 A and more.

Here a plot of BVR magnitude extracted from flux caibrated spectra:

Image

Christian
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