New transcient, perhaps a nova

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Re: New transcient, perhaps a nova

Postby Tim Lester » Sun Jul 30, 2017 10:28 pm

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
novasct2017_20170730_072_Halpha_tlester.png (25.72 KiB) Viewed 3168 times


But not much change at Hbeta.

novasct2017_20170730_072_Hbeta_tlester.png
novasct2017_20170730_072_Hbeta_tlester.png (43.02 KiB) Viewed 3168 times


Tim
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Re: New transcient, perhaps a nova

Postby Joan Guarro Flo » Mon Jul 31, 2017 9:51 am

Hi,

Comparing three nights.

Joan.
Attachments
novasct2017_20170726_847_J. Guarro1.png
novasct2017_20170726_847_J. Guarro1.png (31.72 KiB) Viewed 3159 times
novasct2017_20170726_847_J. Guarro2.png
novasct2017_20170726_847_J. Guarro2.png (52.05 KiB) Viewed 3159 times
novasct2017_20170726_847_J. Guarro4.png
novasct2017_20170726_847_J. Guarro4.png (118.4 KiB) Viewed 3159 times
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Re: New transcient, perhaps a nova

Postby umberto sollecchia » Mon Jul 31, 2017 10:51 am

Bonjour à tous, placez le profil d'osservazione dans la nuit du 30/07/2017.

Profilo nova flux.png
Profilo nova flux.png (12.59 KiB) Viewed 3155 times


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Re: New transcient, perhaps a nova

Postby Paolo Berardi » Mon Jul 31, 2017 11:09 am

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).

Image

Measurements are difficult due to the presence of so many absoption lines that, I think, distort the P-Cygni profiles.

Image

Image

The 2d spectrum comparison:

Image

Average V magnitude for yesterday: 8.67 (July 30 ~21 UT).

Paolo
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Re: New transcient, perhaps a nova

Postby Francois Teyssier » Tue Aug 01, 2017 5:31 pm

Congratulations for the excellent monitoring

It seems that the nova has reached its maximum

Sct2007.PNG
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The database is updated
Please, check and say me

All the best,

François
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Re: New transcient, perhaps a nova

Postby umberto sollecchia » Tue Aug 01, 2017 8:48 pm

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
ASASSN-17hx.gif (946.71 KiB) Viewed 3124 times

Salutations
Umberto
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Re: New transcient, perhaps a nova

Postby Francois Teyssier » Wed Aug 02, 2017 7:34 am

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
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Re: New transcient, perhaps a nova

Postby Paul Luckas » Wed Aug 02, 2017 7:51 am

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
ASASSN-17hx.png (5.58 KiB) Viewed 3107 times


ASASSN-17hx_comp.png
ASASSN-17hx_comp.png (7.84 KiB) Viewed 3107 times
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Re: New transcient, perhaps a nova

Postby Paolo Berardi » Wed Aug 02, 2017 11:55 am

Hi all, my last observations with Lhires III and 1200 l/mm grating.

July 31, H-alpha region, tellurics removed:

Image

Aug 1, H-beta and Fe II (42):

Image

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
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Re: New transcient, perhaps a nova

Postby Joan Guarro Flo » Wed Aug 02, 2017 5:55 pm

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.
Attachments
novasct2017_20170726_847_J. Guarro1.png
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novasct2017_20170726_847_J. Guarro2.png
novasct2017_20170726_847_J. Guarro2.png (37.12 KiB) Viewed 3089 times
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