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Re: New transcient, perhaps a nova

PostPosted: Thu Jul 27, 2017 6:06 pm
by Joan Guarro Flo
Hi,

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

Regards, Joan.

Re: New transcient, perhaps a nova

PostPosted: Thu Jul 27, 2017 7:03 pm
by Paolo Berardi
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).

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

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

Paolo

Re: New transcient, perhaps a nova

PostPosted: Fri Jul 28, 2017 9:53 pm
by Olivier GARDE
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.
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Re: New transcient, perhaps a nova

PostPosted: Sat Jul 29, 2017 11:18 am
by Olivier GARDE
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.

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Re: New transcient, perhaps a nova

PostPosted: Sat Jul 29, 2017 4:01 pm
by umberto sollecchia
Bonjour à tous, placez le profil d'osservazione dans la nuit du 27/07/2017.Umberto

Profilo nova.png
Profilo nova.png (6.49 KiB) Viewed 3575 times

Re: New transcient, perhaps a nova

PostPosted: Sat Jul 29, 2017 6:15 pm
by Joan Guarro Flo
Hi,

This graph is the comfirmation of Olivier's observations.

Regards, Joan.

Re: New transcient, perhaps a nova

PostPosted: Sat Jul 29, 2017 6:29 pm
by Paolo Berardi
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.

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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

Re: New transcient, perhaps a nova

PostPosted: Sun Jul 30, 2017 5:02 am
by Terry Bohlsen
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
novasct2017_20170724_29.png (27.05 KiB) Viewed 3556 times

Re: New transcient, perhaps a nova

PostPosted: Sun Jul 30, 2017 2:05 pm
by Christian Buil
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):

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

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Christian B

Re: New transcient, perhaps a nova

PostPosted: Sun Jul 30, 2017 3:27 pm
by Paolo Berardi
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

Paolo