Page 4 of 5
Re: ASASSN-V J195442.95+172212.6 10.7V mag in Sge
Posted: Sat Aug 18, 2018 10:59 am
by Olivier GARDE
Christian Buil wrote: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...
Re: ASASSN-V J195442.95+172212.6 10.7V mag in Sge
Posted: Sat Aug 18, 2018 3:52 pm
by 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 13299 times
The N III 4634 feature has changed a bit, and the He II 4686 velocity profile moved the most in this region.
- Peter
Re: ASASSN-V J195442.95+172212.6 10.7V mag in Sge
Posted: Sun Aug 19, 2018 6:47 pm
by 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 13277 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
Re: ASASSN-V J195442.95+172212.6 10.7V mag in Sge
Posted: Mon Aug 20, 2018 9:08 am
by 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 13263 times
There is certainly something -1 A away, but not where O III would be expected.
- Peter
Re: ASASSN-V J195442.95+172212.6 10.7V mag in Sge
Posted: Mon Aug 20, 2018 12:38 pm
by 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
Re: ASASSN-V J195442.95+172212.6 10.7V mag in Sge
Posted: Tue Aug 28, 2018 9:46 pm
by 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 13192 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
Re: ASASSN-V J195442.95+172212.6 10.7V mag in Sge
Posted: Tue Aug 28, 2018 10:10 pm
by 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
Re: ASASSN-V J195442.95+172212.6 10.7V mag in Sge
Posted: Mon Sep 03, 2018 5:34 pm
by 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 13062 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
Re: ASASSN-V J195442.95+172212.6 10.7V mag in Sge
Posted: Wed Sep 05, 2018 10:38 am
by Francois Teyssier
Belle série, Christophe!
The outbust is declining (~ 0.4 mag below the maximum)
- Vend47_V.PNG (3.58 KiB) Viewed 13026 times
Equivalent widths from selected spectra of the database
- Vend47 H alpha.png (12.39 KiB) Viewed 13026 times
- Vend47 H beta.png (10.4 KiB) Viewed 13026 times
- Vend47 He II 4686.png (9.66 KiB) Viewed 13026 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
Re: ASASSN-V J195442.95+172212.6 10.7V mag in Sge
Posted: Wed Sep 05, 2018 8:30 pm
by 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