New transcient, perhaps a nova

Information about outbursts of eruptive stars, Be activity, ...
Forrest Sims
Posts: 86
Joined: Thu Feb 09, 2017 5:52 pm

Re: New transcient, perhaps a nova

Post by Forrest Sims »

Thank you Paulo, Umberto and François!

I just read the paper that François provided a link. And then thinking about Paulo's question on the possible FeII lines in our spectrum data. I found this additional paper that may be relevant.
https://arxiv.org/pdf/1208.0380.pdf

This is making my brain hurt but in a good way:)

Saluti!
Woody
Joan Guarro Flo
Posts: 611
Joined: Thu Nov 03, 2011 8:50 pm

Re: New transcient, perhaps a nova

Post by Joan Guarro Flo »

Bongiorno Paolo,

These days I'm away from home. Today I return to Piera and I can intertweet to make this star ...

But now I have difficulties with the IRAS17449 + 2320 of the 10 Mag. My observations of the Owl are really precarious. The ASASSN-17ib, with a magnitude of 11.43, can be beyond my possibilities.

A presto, Joan.
Francois Teyssier
Posts: 1520
Joined: Fri Sep 23, 2011 1:01 pm
Location: Rouen
Contact:

Re: New transcient, perhaps a nova

Post by Francois Teyssier »

About Fe II (42) : good identification, Paolo.
Steve's comment:
The Fe II shows a weak P Cyg with a velocity compatible with marginally opaque. The He I is interesting but more the strength of the Na I D is neat. That there's emission there is also nice, it's chopped up by the interstellar component.

About William's classification. This is just taxonomic. The physics behind is contested (discrete ejecta follwed by a slower wind) notably by Steve.
Other papers of interest from Williams, showing spectroscopic development of a nimber of novae :

[1] The formation of novae spectra
R.E. Williams
A.J., Vol. 104, Number 2, 1992

[2] The evolution and classification of postoutburst novae spectra
R.E. Williams & al.
A.J., 376:721-737, 1991

[3] The Tololo nova survey : spectra of recent novae
R.E. Williams, M.M. Phillips, M. Hamuy
A.J. supp. ser., 90:297-316, 1994

and

[6] Origin of the `He/N' and `Fe II' Spectral Classes of Novae
Robert Williams
http://arxiv.org/ftp/arxiv/papers/1208/1208.0380.pdf, 2012

My page about novae (to be updated)

http://www.astronomie-amateur.fr/Projet ... Novae.html

François
Paolo Berardi
Posts: 578
Joined: Thu Sep 29, 2011 10:51 pm

Re: New transcient, perhaps a nova

Post by Paolo Berardi »

Hi all! Joan, yesterday I measured mag V 11.32. H-alpha is strong, also h-beta but the continuum and other lines are weak. I hope it's within your reach.

François, thanks a lot for your and Steve's valuable information. Yesterday I observe it with Lhires III and 600 l/mm grating.

Fe multiplet is more clear:

Image

Radial velocity of the three Fe II lines (P-Cygni):

Image

Radial velocity of H-beta P-Cygni profile:

Image


H-alpha region:

Image

Radial velocity of H-alpha P-Cygni profile:

Image

Paolo

PS: the profiles are calibrated in absolute flux by means of a rescaling to Umberto's fluxed spectrum
umberto sollecchia
Posts: 242
Joined: Tue Dec 30, 2014 3:25 pm

Re: New transcient, perhaps a nova

Post by umberto sollecchia »

Bonsoir à tous, ma contribution avec un profil dans l'observation de la nuit 01/07/2017
Le profil est calibré en flux absolu avec la photométrie de Paul exécuté en même temps.
Umberto
Profilo nova Flux.png
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umberto sollecchia
Posts: 242
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Re: New transcient, perhaps a nova

Post by umberto sollecchia »

Bonjour à tous, placez le profil d'observation de la nuit de 03-07-2017.Umberto
Profilo nova.png
Profilo nova.png (6.5 KiB) Viewed 7169 times
Forrest Sims
Posts: 86
Joined: Thu Feb 09, 2017 5:52 pm

Re: New transcient, perhaps a nova

Post by Forrest Sims »

Hello everyone!

Nice work Umberto.

Here is my contribution from early on 4 July taken with the LISA. I have made some improvements to my focus that reduced the FWHM of the NeAr lines thanks to some help from François. So my resolution is much better than for the previous data I posted on this target. However I see a dip or belly in the continuum of my curve from about 4200Å to 5900Å that I cannot explain. I used the Reference star HD207673 and the MILES reference spectrum in ISIS to determine the response curve. The Hbeta line being so strong tends to suppress the detail that is really there when zoomed in on the other emission lines Does anyone have an idea as to why this continuum dip?

Thank you.

Woody
Attachments
asassn-17hx_20170704_280_Woody Sims Annotated.png
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umberto sollecchia
Posts: 242
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Re: New transcient, perhaps a nova

Post by umberto sollecchia »

Merci Forrest, le problème du continuum, je pense qu'il est parce que le target n'a pas été placé exactement au centre de la fente, ou même la réponse instrumentale.
J'ai utilisé le miles hd179761 comme une étoile de référence.
Saluti-
Umberto
umberto sollecchia
Posts: 242
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Re: New transcient, perhaps a nova

Post by umberto sollecchia »

Forrest Bonjour, il me semble que le profil de l'étoile HD207673 (ci-joint) que vous avez utilisé pour référence est un peu étrange. J'utiliser une autre étoile.
profilo hd 207673.png
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Salutations
Umberto
umberto sollecchia
Posts: 242
Joined: Tue Dec 30, 2014 3:25 pm

Re: New transcient, perhaps a nova

Post by umberto sollecchia »

Bonjour, placé le profil d'observation de la nuit 07/04/2017. Il est calibré en flux absolu avec la photométrie par Paolo en même temps.Umberto
Profilo Nova Flux US.png
Profilo Nova Flux US.png (11.37 KiB) Viewed 7121 times
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