New transcient, perhaps a nova

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Re: New transcient, perhaps a nova

Postby Joan Guarro Flo » Thu Jul 27, 2017 6:06 pm

Hi,

This is the aspect of NOVA Sct 2017 on the last night, wiht the SC16 and the Mussol echelle.

Regards, Joan.
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__novasct2017_20170726_847_J. Guarro.png
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__novasct2017_20170726_847_J. Guarro1.png
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Re: New transcient, perhaps a nova

Postby Paolo Berardi » Thu Jul 27, 2017 7:03 pm

Great spectra from Catalunya... congratulation Fran, Joan!

Yes, the brightening phase goes on. The photometry for yesterday (July 26, ~ 21 UT):

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H-beta and Fe II (42) region. Lhires III 1200 (R ~4200).

Image

Measures on P-Cyg absorption minimum of heliocentric corrected spectrum:

H-beta Rv ~ -270 Km/s
Fe II (42) Rv ~ -245 Km/s

Paolo
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Re: New transcient, perhaps a nova

Postby Olivier GARDE » Fri Jul 28, 2017 9:53 pm

A spectrum taken during OHP spectro party with Stéphane Charbonnel and Pascal Le Dû.
Many wind during all the night...
I will try this night with my eshel spectrograph.
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 Olivier GARDE » Sat Jul 29, 2017 11:18 am

Effondrement de la raie H Alpha sur mon dernier spectre de la nuit dernière en comparaison des 3 autres spectres obtenu avec le même set up depuis le 14 juiller.

Collapse of the H alpha line on my last spectrum last night in comparison to the 3 other spectra obtained with the same set up since the 14th July.

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 umberto sollecchia » Sat Jul 29, 2017 4:01 pm

Bonjour à tous, placez le profil d'osservazione dans la nuit du 27/07/2017.Umberto

Profilo nova.png
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Re: New transcient, perhaps a nova

Postby Joan Guarro Flo » Sat Jul 29, 2017 6:15 pm

Hi,

This graph is the comfirmation of Olivier's observations.

Regards, Joan.
Attachments
novasct2017_20170718_842_Olivier Garde2.png
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Re: New transcient, perhaps a nova

Postby Paolo Berardi » Sat Jul 29, 2017 6:29 pm

Well done Umberto. Olivier, very nice the OHP joint venture spectrum!

The comparison of your great echelle spectra (Olivier and Joan) show very well the effect of the continuum raising.

I have another example with Lhires III (1200 l/mm 26/7, 600 l/mm 4/7). The same spectra compared in absolute flux and rescaled to unity at ~ 5000A.

Image

Image

Yesterday (July 28, ~ 21 UT) I measured V mag 8.70, perhaps the maximum brightness until now.

The ARAS database database begin to be well "supplied". I think this interesting nova deserves to be observed in this peculiar phase.

Paolo
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Re: New transcient, perhaps a nova

Postby Terry Bohlsen » Sun Jul 30, 2017 5:02 am

I took another spectra of this interesting nova last night using my LHIRES at ~R=14000. The strength of the Ha line has dropped significantly compared to the continuum.
Terry
novasct2017_20170724_29.png
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Terry Bohlsen
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Australia
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Re: New transcient, perhaps a nova

Postby Christian Buil » Sun Jul 30, 2017 2:05 pm

Dramatic changes of nova Sct 2017 also observed during the OHP spectro star party (Observatoire de Haute-Provence) from 22 to 28 July (FSQ106ED refractor, Alpy600, ATIK460EX/ASI290MM):

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Details (note CaII H & K relative intensity):

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Close look of 27.8 July spectrum (note NaI doublet separation, Alpy600 resolution pushed near R=1000, thanks to use of a small refractor, a 18 microns slit and small 2.9 microns pixel of AIS290MM):

Image

Me and Valerie are now the only the valorous observers on the Spectro Star Party site (last night) ;-) :

Image

Image

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Re: New transcient, perhaps a nova

Postby Paolo Berardi » Sun Jul 30, 2017 3:27 pm

Hi Christian, nice to see you, Valerie and other friends in the workshop photos! I miss the OHP meeting...

The nova exhibited a large increase in brightness. I measured V mag 10.31 and 8.70 for the evening of July 22 and 28 respectively.

My last observation on July 28 with Lhires III and 1200 l/mm grating, fluxed thanks to a low-res spectrum (Alpy 600) by Lorenzo Franco taken in the same night.

H-gamma region with a lot of absorption lines (iron and other metals, I imagine).

Image

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