New transcient, perhaps a nova

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Re: New transcient, perhaps a nova

Postby Olivier GARDE » Wed Jul 19, 2017 12:24 pm

Last spectrum of this nova taken last night with a poor sky at the horizon.
The magnitude still remain at the same level and no more evolution on the velocity, but the small "bump" in the absorption line grows every day.

Image
LHIRES III #5, LISA, e-Shel, C14, RC400 Astrosib, AP1600
http://o.garde.free.fr/astro/Spectro1/Bienvenue.html
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Re: New transcient, perhaps a nova

Postby Christian Buil » Mon Jul 24, 2017 1:50 am

Spectre fait avec un petit diamètre (FSQ106ED - 106 mm) et une caméra ASI290MM (capteur CMOS) sur Alpy600, avec ce que j'avais sous la main à l'OHP, ou ce déroule actuellement l'école de spectroscopie :

Image

Image

Voir aussi pour le setup et conditions le fil :

http://www.spectro-aras.com/forum/viewtopic.php?f=5&t=1744&p=8845#p8845

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Re: New transcient, perhaps a nova

Postby Michel Verlinden » Mon Jul 24, 2017 4:16 pm

Bonjour Christian,
C'est un spectre fin, qu'obtiens-tu comme rapport signal à bruit sur les raies dans le bleu avec la camera ASI 290MM, par rapport à une CCD sans changer le reste du setup ?
Bien cordialement,
Michel Verlinden
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Re: New transcient, perhaps a nova

Postby umberto sollecchia » Tue Jul 25, 2017 12:35 pm

Bonjour à tous, le week-end passé, moi et Paolo Berardi nous sommes allés à un camping astronomique sur le Gran Sasso à 1600 mt. Dans la nuit du 22/07/2017,nous avons observé la nova aussì avec photométrie.
Voici le profil spectral calibré dans le flux absolu.
Umberto

Profilo Nova Flux.png
Profilo Nova Flux.png (11.21 KiB) Viewed 3573 times


Profilo nova flux 2.png
Profilo nova flux 2.png (20.97 KiB) Viewed 3572 times
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Re: New transcient, perhaps a nova

Postby Francisco Campos » Tue Jul 25, 2017 3:48 pm

Bonjour à tous,

très bons tous ces spectres. On doit continuer la surveillance parce que la nova est en train de monter fortement de magnitude: elle n'a pas encore atteint le maximum.

Bien cordialement,
Fran
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Re: New transcient, perhaps a nova

Postby Tim Lester » Wed Jul 26, 2017 8:34 am

The nova has brightened significantly. Here is my result for July 26 with my new echelle.

novasct2017_20170726_086_tlester_1.png

novasct2017_20170726_086_tlester_2.png

novasct2017_20170726_086_tlester_3.png

novasct2017_20170726_086_tlester_4.png
novasct2017_20170726_086_tlester_4.png (29.63 KiB) Viewed 3544 times


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Re: New transcient, perhaps a nova

Postby Paolo Berardi » Wed Jul 26, 2017 12:40 pm

Hi all! Fran, thanks for your comment. Very nice echelle spectrum Tim! I can confirm the extremely high brightness of the nova. Yesterday I measured V mag 9.15 at ~ 21 UT. Even with 1200 l/mm grating, the continuum is very intense and shows clearly the telluric lines in the H-alpha region (removed in the plots below).

Image

Image

Absolute flux calibration is obtained by rescaling the continuum to a low-res fluxed spectrum taken by Umberto (Alpy 600) at the same time.

H-alpha P-cyg profile changed again. The double absorption minimum seems gone. The heliocentric velocity of minimum is ~ -305 Km/s. The same measurement for Si II doublet return ~ -220 Km/s. Fe II 6456 Rv is ~ -235 Km/s.

Prof. Taichi Kato (who is looking at ARAS spectra, ref. VSNET ml), talks about a similarity of ASASSN-17hx evolution with the old nova V723 Cas.

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Re: New transcient, perhaps a nova

Postby umberto sollecchia » Wed Jul 26, 2017 2:25 pm

Bonsoir, hier soir, je remarquai la nova. Voici deux profils, le premier calibré flux absolu 12x360, et l'autre 23x360, en intensité relative parce que la photomètrie ne couvre pas tout au long de l'intégration.

Profilo nova flux.png
Profilo nova flux.png (10.15 KiB) Viewed 3528 times


Profilo nova .png
Profilo nova .png (9.18 KiB) Viewed 3528 times

Umberto
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Re: New transcient, perhaps a nova

Postby umberto sollecchia » Thu Jul 27, 2017 1:47 pm

Bonjour à tous, placez le profil d'osservazione de la nuit du 26-07-2017. La nova est encore augmentée par magitudine,maintenant mesurer 8,86.
Umberto.


Profilo nova flux.png
Profilo nova flux.png (9.8 KiB) Viewed 3488 times
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Re: New transcient, perhaps a nova

Postby Francisco Campos » Thu Jul 27, 2017 3:10 pm

Very interesting all the spectra.

Here is a comparison of two spectra, from July 22th and yesterday. The brightening began 3-4 days ago and the changes are dramatic!

Comparativa 4 dias.png


Comparativa 4 dias amp.png


Greetings
Fran
Attachments
Comparativa 4 dias amp.png
Last edited by Francisco Campos on Thu Jul 27, 2017 6:22 pm, edited 1 time in total.
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