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Re: New transcient, perhaps a nova
Posted: Sun Jul 30, 2017 10:28 pm
by Tim Lester
Was able to get spectra the last two nights (29th and 30th) with my new echelle. Halpha still dropping.
- novasct2017_20170730_072_Halpha_tlester.png (25.72 KiB) Viewed 6829 times
But not much change at Hbeta.
- novasct2017_20170730_072_Hbeta_tlester.png (43.02 KiB) Viewed 6829 times
Tim
Re: New transcient, perhaps a nova
Posted: Mon Jul 31, 2017 9:51 am
by Joan Guarro Flo
Hi,
Comparing three nights.
Joan.
Re: New transcient, perhaps a nova
Posted: Mon Jul 31, 2017 10:51 am
by umberto sollecchia
Bonjour à tous, placez le profil d'osservazione dans la nuit du 30/07/2017.
- Profilo nova flux.png (12.59 KiB) Viewed 6816 times
Umberto
Re: New transcient, perhaps a nova
Posted: Mon Jul 31, 2017 11:09 am
by Paolo Berardi
Great observations Joan, Umberto!
Huge variations again in the yesterday spectrum (July 30). A lot of absorption lines are emphasised. While for the H-beta line there has been a slight change, Fe II lines (but also many other lines) have greatly increased the velocity (blueshifted P-Cyg absorption and broaded emission component).
Measurements are difficult due to the presence of so many absoption lines that, I think, distort the P-Cygni profiles.
The 2d spectrum comparison:
Average V magnitude for yesterday: 8.67 (July 30 ~21 UT).
Paolo
Re: New transcient, perhaps a nova
Posted: Tue Aug 01, 2017 5:31 pm
by Francois Teyssier
Congratulations for the excellent monitoring
It seems that the nova has reached its maximum
- Sct2007.PNG (5.34 KiB) Viewed 6788 times
The database is updated
Please, check and say me
All the best,
François
(Back home)
Re: New transcient, perhaps a nova
Posted: Tue Aug 01, 2017 8:48 pm
by umberto sollecchia
Salut, j'ai fait une animation avec des spectres pris jusqu'à présent, calibré flux absolu par photométrie de Paolo.
Il souligne que l'animation est interpolée, pour sa réalisation,j'ai utilisé 12 observations qui couvrent la plage où la nova atteint la luminosité maximale.
- ASASSN-17hx.gif (946.71 KiB) Viewed 6785 times
Salutations
Umberto
Re: New transcient, perhaps a nova
Posted: Wed Aug 02, 2017 7:34 am
by Francois Teyssier
Bravo Umberto, autant pour le suivi que pour la présentation de l'évolution du spectre.
Bonne continuation pour le déclin vers la phase nébulaire
François
Re: New transcient, perhaps a nova
Posted: Wed Aug 02, 2017 7:51 am
by Paul Luckas
I've not had much chance to take spectra due to rain, but finally managed some spectrophotometry of the now changing and brightening ASASSN-17hx last night. A comparison with my last spectrum of 7th July is also attached.
Paul
- ASASSN-17hx.png (5.58 KiB) Viewed 6768 times
- ASASSN-17hx_comp.png (7.84 KiB) Viewed 6768 times
Re: New transcient, perhaps a nova
Posted: Wed Aug 02, 2017 11:55 am
by Paolo Berardi
Hi all, my last observations with Lhires III and 1200 l/mm grating.
July 31, H-alpha region, tellurics removed:
Aug 1, H-beta and Fe II (42):
In the last few days, metal lines increased a lot the P-Cyg RV (not the
Balmer lines). Many P-Cyg profile absorptions are now double (two minima).
Paolo
Re: New transcient, perhaps a nova
Posted: Wed Aug 02, 2017 5:55 pm
by Joan Guarro Flo
Hi,
The H alpha of NOVA Sct 2017, is ascending again, I hope that does it hard.. The minimun, ( at de moment ), is registereg by Tim Lester, on the night 2017 07 30.
Congratulations to all, Umberto, si sta facendo un grande lavoro.
Joan.