ASASSN-V J195442.95+172212.6 10.7V mag in Sge

[Olivier GARDE]

Chez moi, sur une Atk460EX à -10°, j'ai l'impression que je dois avoir pas mal de points chauds, dont certains saturent (je n'ai jamais pratiqué un temps de pose aussi long avec cette caméra). C'est ton cas ?
(intéressent de voir sur image souillée 0 65526 et/ou histogramme du dark).

Christian

J'ai des points chauds que j'arrive à enlever via le fichier cosmétique.
Ok je t'envoie des images...

[Peter Somogyi]

Interesting to learn how the eShels work, hope we can compare our dataset soon.
I decided to follow the HeII 4686 / N III region, a fresh result from yesterday (2 x 1200, 4 x 1200, 4 x 1200 s, R~8600):

vend47.gif (39.17 KiB) Viewed 14697 times

The N III 4634 feature has changed a bit, and the He II 4686 velocity profile moved the most in this region.
- Peter

[Christophe Boussin]

Hello all,

I obtained the following spectrum last night, August 18 at 21 h 29 TU with a resolution of 509 (JJ = 2458349.4237) and an acquisition time of 75 min (15 x 300 s) :

TCPJ19544251+17222 on August 18, 2018

_tcpj19544251+17222_20180818_896_Christophe Boussin_3700_7570.png (104.64 KiB) Viewed 14675 times

The comparison of spectra obtained between August 11 and 18 show an increase in the relative intensity of the lines at low resolution :

TCPJ19544251+17222 on August 11th, 13th, 15th and 18th, 2018

TCPJ19544251+17222 on August 11th, 13th, 15th and 18th, 2018 (zoom)

Spectroscopically,

Christophe BOUSSIN

[Peter Somogyi]

Nice and valuable serie Christophe with so many prominent lines measurable, hope you can continue!
Here is the weekend progress:

The HeII 4686 peak increased linearily without profile change, whilst the other features mostly remaied constant.
I did retry the O3 region:

OIII_0817_0819.gif (39.28 KiB) Viewed 14661 times

There is certainly something -1 A away, but not where O III would be expected.
- Peter

[Christophe Boussin]

Hello Peter,

Thank you very much for your encouragement !!
Clearly, there are still lines to identify...and it's exciting !!
For me, the weather has unfortunately become very cloudy ... I'll have to wait to resume tracking Vend47 !!
I hope you can continue your very interesting investigations at high resolution and detect changes in the blue part of the spectrum and ... maybe the appearance of the [OIII] lines !?

Clear skies !

Christophe

[Christophe Boussin]

Hello all,

Enjoying the return of good weather, I obtained the following spectrum on August 25 at 21 h 54 TU with a resolution of 523 (JJ = 2458356.4301) and an acquisition time of 50 min (10 x 300 s) :

TCPJ19544251+17222 on August 25, 2018

_tcpj19544251+17222_20180825_913_Christophe Boussin_3700_7570.png (103.8 KiB) Viewed 14590 times

The comparison of the spectra obtained between August 11 and 25 shows an increase in the relative intensity of the lines and especially between August 18 and 25.

TCPJ19544251+17222 on August 11th, 13th, 15th, 18th and 25th, 2018

This increase is clearly visible on the Balmer lines and HeII line at 4686A but the [OIII] lines remain undetectable at low resolution.

TCPJ19544251+17222 on August 11th, 13th, 15th, 18th and 25th, 2018 (zoom)

Spectroscopically,

Christophe BOUSSIN

[Christian Buil]

A new near-UV spectrum (now by using a CCD camera) :



(now the OIII line at 3444 A is more easy to detect).

Christian

[Christophe Boussin]

Hello all,

After a beautiful sunny afternoon, I obtained the following spectrum on September 1st at 21 h 36 TU with a resolution of 507 (JJ = 2458363.421) and an acquisition time of 60 min (12 x 300 s) :

TCPJ19544251+17222 on September 1st, 2018

_tcpj19544251+17222_20180901_900_Christophe Boussin_3700_7570.png (109.71 KiB) Viewed 14460 times

The comparison of the spectra obtained between August 11 and September 1st clearly shows an increase in the relative intensity of the Balmer lines since August 18.
This increase is particularly evident for the Halpha line and especially between 25 August and 1 September.

TCPJ19544251+17222 on August 11th, 13th, 15th, 18th, 25th and 1st September, 2018

Has anyone else noticed this evolution ?
The relative intensity of the HeII line at 4686A remains unchanged since August 25.
The [OIII] lines at 4363, 4959 and 5007 are always undetectable at low resolution.

TCPJ19544251+17222 on August 11th, 13th, 15th, 18th, 25th and 1st September, 2018 (zoom)

Spectroscopically,

Christophe BOUSSIN

[Francois Teyssier]

Belle série, Christophe!

The outbust is declining (~ 0.4 mag below the maximum)

Vend47_V.PNG (3.58 KiB) Viewed 14424 times

Equivalent widths from selected spectra of the database

Vend47 H alpha.png (12.39 KiB) Viewed 14424 times

Vend47 H beta.png (10.4 KiB) Viewed 14424 times

Vend47 He II 4686.png (9.66 KiB) Viewed 14424 times

Confirmation of Christophe observations

Further observations of the decline are welcome at low resolution.
Temperature of the hot component will increase and high ionization lines are expected, notably [Fe VII] and perhaps Raman OVI

All the best,
François

[Christophe Boussin]

Merci François !
Quelle évolution des EW !
La météo s'annonce favorable pour la fin de semaine chez moi
J'espère pouvoir continuer le suivi de Vend47 avec un nouveau spectre… et détecter de nouvelles raies !

Bon ciel à tous,

Christophe