Page 13 of 19
Re: New transcient, perhaps a nova
Posted: Tue Aug 29, 2017 10:23 am
by umberto sollecchia
Bonjour, placez le profil spectral de la journée 26-08-2017, calibré en Flux absolu.
- Profolo nova flux.png (6.42 KiB) Viewed 8714 times
Re: New transcient, perhaps a nova
Posted: Thu Aug 31, 2017 2:47 pm
by umberto sollecchia
Bonsoir du tout, le profil de l'observation sur la nuit du 29-08-2017.Je joint également une comparaison entre le 26-08-2017 et le 29-08-2017 où il y a une légère hausse du H-alpha le jour 29-08-2017.
Umberto
- Profilo nova flux.png (6.49 KiB) Viewed 8714 times
- Compararison crop.jpg (22.22 KiB) Viewed 8714 times
Re: New transcient, perhaps a nova
Posted: Sat Sep 02, 2017 2:59 pm
by Francois Teyssier
Excellent survey of a very interesting and peculiar nova
The light curve (AAVSO V) and ARAS Spectra
Now a plateau at mag V ~ 11
- NovaSct2017.PNG (8.73 KiB) Viewed 8701 times
All the best,
François Teyssier
Re: New transcient, perhaps a nova
Posted: Sun Sep 03, 2017 1:11 pm
by Joan Guarro Flo
Hi,
Although ns2107 brightness goes down. Over the last 24 hours it has increased its emission
Cheers, Joan.
Re: New transcient, perhaps a nova
Posted: Tue Sep 05, 2017 7:16 am
by umberto sollecchia
Bonne journée pour tous, le profil spectral du jour 01-09-2017.Umberto
Re: New transcient, perhaps a nova
Posted: Tue Sep 05, 2017 1:23 pm
by umberto sollecchia
Bonjour, le profil de la nuit dernière et une comparaison dans la région H-alpha avec le jour 01-09-2017. L'hydrogène monte encore. Umberto
- Profilo nova flux.png (6.66 KiB) Viewed 8630 times
- Comaparazione H-alfa.png (7.57 KiB) Viewed 8630 times
Re: New transcient, perhaps a nova
Posted: Fri Sep 08, 2017 10:07 pm
by Paolo Berardi
Hi all, the nova is undergoing a strong rebrightening. During my last observation, Sep 4, was shining at V mag 10.86 while this evening (Sep 8, ~ 19UT) V mag is 9.76.
The actual H-beta region spectrum exhibits lines (hydrogen and iron - helium?) with a complex P-Cyg profile.
On a low-res spectrum used for flux calibration (by Umberto, same night), I can see P-Cyg profiles on all the Balmer, helium and metals emission lines.
Heliocentric radial velocity of H-beta line (two main velocities, ~-500 and -1000 Km/s):
The comparison with Sep 4 spectrum:
Paolo
Re: New transcient, perhaps a nova
Posted: Fri Sep 08, 2017 10:13 pm
by umberto sollecchia
Bonsoir, voici le profil de faible résolution pris en même temps que celui de Paolo Berardi.Umberto
- asassn-17hx_20170908_780_Umberto Sollecchia flux.jpg (22.21 KiB) Viewed 8607 times
- asassn-17hx_20170908_780_2.png (31.79 KiB) Viewed 8606 times
Re: New transcient, perhaps a nova
Posted: Sat Sep 09, 2017 3:51 pm
by Joan Guarro Flo
Hi,
This is a complement of Paolo and Umberto's explanations. The Hidrogen emission loses strength.
Joan.
Re: New transcient, perhaps a nova
Posted: Sun Sep 10, 2017 7:57 pm
by Tim Lester
Here is nova sct on the 10th captured with my echelle spectrograph at R = 12000. It is still brightening (V mag = 9.5 on AAVSO) but it is low in the sky and difficult to get good S/N at the blue end..
- novasct2017_20170910_014_tlester_3.png (24.85 KiB) Viewed 8541 times
Tim