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

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

Postby Francois Teyssier » Sat Sep 08, 2018 9:33 pm

An aexcellent LISA spectrum obtained by Woody Sims
[Fe VII] and Raman OVI appears clearly during the decline

tcpj19544251+1722281_20180907_178_Forrest Sims.png


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

Postby Peter Somogyi » Sun Sep 09, 2018 10:34 am

Hello Francois,

I think there's an anomaly with [Fe VIII] 6087. Last night's result at R~12000:
Vend47_FeVIII_6087.gif
Vend47_FeVIII_6087.gif (51.8 KiB) Viewed 221 times

There's a feature at 6084A which EW has approx. doubled (Olivier also has it), and the 3A difference to 6087 is suspicous (basic features don't have any shift).
And, a NEW feature has appeared at 6106A (both the features easily confirmable by human look on all the 3 x 30 minute raw frames).
Calibration is rock solid: 11 lines (continuous), RMS=0.003603 (2 order, one line has 0.008, all the others <= 0.003).
Heliocentric correction was not applied for this star (according to default db rules, to my understanding).

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

Postby Christophe Boussin » Sun Sep 09, 2018 5:09 pm

Hello all,

Congratulations to Woody and Peter for their spectra !
After an uncertain weather throughout the afternoon of September 7th, the sky finally cleared at the end of the day (as expected...) and I was able to also resume tracking Vend 47 !

I obtained the following spectrum at 21 h 16 TU with a resolution of 506 (JJ = 2458369.412) and an acquisition time of 60 min.

_tcpj19544251+17222_20180907_886_Christophe Boussin_3700_7570.png
TCPJ19544251+17222 on September 7th, 2018
_tcpj19544251+17222_20180907_886_Christophe Boussin_3700_7570.png (97.74 KiB) Viewed 209 times

The comparison of the spectra always shows a clear increase in the relative intensities of the Balmer lines.
The relative intensity of the HeII line at 4686A still seems unchanged since August 25, as well as those of the HeI lines at 6678A and 7065A.

tcpj19544251+17222_201808_11_13_15_18_25_01_07_Christophe Boussin.png
TCPJ19544251+17222 on August 11th, 13th, 15th, 18th, 25th and 1st, 7th September, 2018

I also detect something at 5721A and 6087A but that does not seem conclusive to me at low resolution since these "lines" are already visible in my previous spectra. The continuum seems to evolve significantly at short wavelength…?

tcpj19544251+17222_201808_11_13_15_18_25_01_07_Christophe Boussin2.png
TCPJ19544251+17222 on August 11th, 13th, 15th, 18th, 25th and 1st, 7th September, 2018 (zoom)

However, I think I have also detected the OIV Raman line at 6826A.

tcpj19544251+17222_201808_11_13_15_18_25_01_07_Christophe Boussin3.png
TCPJ19544251+17222 on September 7th, 2018 (zoom)

...and the [OIII] lines at 4363, 4959 and 5007 are always undetectable at low resolution.

Clear skies to all,

Christophe BOUSSIN
CBO (Newton 200 F/5 / Alpy600 / Atik 314L+ / Atik Titan) @ ARAS database
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Re: ASASSN-V J195442.95+172212.6 10.7V mag in Sge

Postby Peter Somogyi » Sun Sep 16, 2018 10:25 am

Hello,

I have taken a closer look (9 x 10 min) with 12" Newton + LHires 600/mm grating + 35 micron slit at R~2700 at the Raman profile, and it is really double peaked (resembling to AG Peg):
Vend47_vs_13Lyr_per3.gif

To elaborate M-ish features, I've taken 13 Lyr at the same R~2700 (normalised both targets), then estimated a 1/3 multiplier visually (tellurics included - please ignore [6870-7000A]), and added + 0.66 constant. It seems to fit well on the continuum. The RV distribution:
Vend47_Raman_OVI_RV.gif
Vend47_Raman_OVI_RV.gif (29.17 KiB) Viewed 88 times

Note that this feature is a hard target at this medium resolution, due to the high magnification factor required to acquire the real details.

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

Postby Christian Buil » Sun Sep 16, 2018 2:09 pm

A near-UV spectrum taken by using the 60-cm telescope of Pic du Midi observatory and UVEX2 spectrograph
(note the evident detection of OIII line at 3444 A):

Image

Christian Buil & Valérie Desnoux
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Re: ASASSN-V J195442.95+172212.6 10.7V mag in Sge

Postby Christophe Boussin » Wed Sep 19, 2018 3:14 pm

Hello all,

Christian, it's always impressive to see the spectrum of Vend47 in the near UV area !
Have you noticed any changes from your August 26 spectrum in this spectral region?

Here is my last contribution to the tracking of Vend47 with the spectra obtained :

on September 11 at 21 h 39 UT with a resolution of 504 (JJ = 2458373.4235) and an acquisition time of 60 min (12 x 300 s).

_tcpj19544251+17222_20180911_903_Christophe Boussin_3700_7570.png
TCPJ19544251+17222 on September 11th, 2018
_tcpj19544251+17222_20180911_903_Christophe Boussin_3700_7570.png (104.05 KiB) Viewed 35 times


on September 15 at 21 h 51 UT with a resolution of 505 (JJ = 2458377.4319) and an acquisition time of 60 min (12 x 300 s).

_tcpj19544251+17222_20180915_911_Christophe Boussin_3700_7570.png
TCPJ19544251+17222 on September 15th, 2018
_tcpj19544251+17222_20180915_911_Christophe Boussin_3700_7570.png (99.61 KiB) Viewed 35 times

The evolution of the Vend47 spectrum between August 11 and September 15, 2018 appears below :

tcpj19544251+17222_201808_11_13_15_18_25_01_07_11_15_Christophe Boussin.png
TCPJ19544251+17222 on August 11th, 13th, 15th, 18th, 25th and 1st, 7th, 11th and 15th September, 2018

tcpj19544251+17222_201808_11_13_15_18_25_01_07_11_15_Christophe Boussin2.png
TCPJ19544251+17222 on August 11th, 13th, 15th, 18th, 25th and 1st, 7th, 11th and 15th September, 2018 (zoom)

The relative intensities of Balmer lines are always increasing.
The profiles of Halpha, Hbeta lines renormalized around their local continuum are an example :

tcpj19544251+17222(normcont)_Halpha_Christophe Boussin.png
TCPJ19544251+17222 (Halpha)
tcpj19544251+17222(normcont)_Halpha_Christophe Boussin.png (36.1 KiB) Viewed 35 times

tcpj19544251+17222(normcont)_Hbeta_Christophe Boussin.png
TCPJ19544251+17222 (Hbeta)
tcpj19544251+17222(normcont)_Hbeta_Christophe Boussin.png (40.43 KiB) Viewed 35 times

The profile of the HeII line at 4686A, also renormalized around its local continuum, shows that the relative intensity of this line seems to be maintained at the same level since September 1st :

tcpj19544251+17222(normcont)_HeII4686_Christophe Boussin.png
TCPJ19544251+17222 (HeII 4686A)
tcpj19544251+17222(normcont)_HeII4686_Christophe Boussin.png (46.53 KiB) Viewed 35 times

Peter, very interesting...I hope you can follow the evolution of this structure !
I also detect (but with a much lower resolution ...) a double peak for the position that corresponds to the Raman OIV line at 6826A. This one seems to evolve since September 7th (to follow...).

tcpj19544251+17222_201808_11_13_15_18_25_01_07_11_15_Christophe Boussin3.png
TCPJ19544251+17222 (Raman OIV 6826A)

And…the [OIII] lines at 4363, 4959 and 5007A are always undetectable at low resolution …

Spectroscopically,

Christophe BOUSSIN
CBO (Newton 200 F/5 / Alpy600 / Atik 314L+ / Atik Titan) @ ARAS database
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