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

[Francois Teyssier]

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

f

[Peter Somogyi]

Hello Francois,

I think there's an anomaly with [Fe VIII] 6087. Last night's result at R~12000:

Vend47_FeVIII_6087.gif (51.8 KiB) Viewed 16562 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

[Christophe Boussin]

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 on September 7th, 2018

_tcpj19544251+17222_20180907_886_Christophe Boussin_3700_7570.png (97.74 KiB) Viewed 16550 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 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 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 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

[Peter Somogyi]

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):

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 (29.17 KiB) Viewed 16429 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

[Christian Buil]

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):



Christian Buil & Valérie Desnoux

[Christophe Boussin]

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 on September 11th, 2018

_tcpj19544251+17222_20180911_903_Christophe Boussin_3700_7570.png (104.05 KiB) Viewed 16376 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 on September 15th, 2018

_tcpj19544251+17222_20180915_911_Christophe Boussin_3700_7570.png (99.61 KiB) Viewed 16376 times

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

TCPJ19544251+17222 on August 11th, 13th, 15th, 18th, 25th and 1st, 7th, 11th and 15th September, 2018

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 (Halpha)

tcpj19544251+17222(normcont)_Halpha_Christophe Boussin.png (36.1 KiB) Viewed 16376 times

TCPJ19544251+17222 (Hbeta)

tcpj19544251+17222(normcont)_Hbeta_Christophe Boussin.png (40.43 KiB) Viewed 16376 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 (HeII 4686A)

tcpj19544251+17222(normcont)_HeII4686_Christophe Boussin.png (46.53 KiB) Viewed 16376 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 (Raman OIV 6826A)

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

Spectroscopically,

Christophe BOUSSIN

[Christian Buil]

New UV spectrum taken the Sept. 20 and an improved signal to noise ratio (I use now an Atik414EX camera on UVEX2 and a longer exposure):





Christian

[Christian Buil]

Now UVEX is adjusted for capture red and near-IR part of the spectrum (simple grating rotation + OG570 order filter = UVEX -> IREX) - Raman emission is well detected :





Christian

[Christophe Boussin]

Hello all,

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

on September 25 at 21 h 53 UT with a resolution of 509 (JJ = 2458387.4258) and an acquisition time of 40 min (8 x 300 s).

TCPJ19544251+17222 on September 25th, 2018

_tcpj19544251+17222_20180925_912_Christophe Boussin_3700_7570.png (109.32 KiB) Viewed 16162 times

on September 28 at 21 h 51 UT with a resolution of 507 (JJ = 2458390.4231) and an acquisition time of 35 min (7 x 300 s).

TCPJ19544251+17222 on September 28th, 2018

_tcpj19544251+17222_20180928_911_Christophe Boussin_3700_7570.png (106.79 KiB) Viewed 16162 times

The evolution of the Vend47 spectrum between August 11 and September 28, 2018 appears below :

TCPJ19544251+17222 on August 11th, 13th, 15th, 18th, 25th and 1st, 7th, 11th, 15th, 25th and 28th September, 2018

TCPJ19544251+17222 on August 11th, 13th, 15th, 18th, 25th and 1st, 7th, 11th, 15th, 25th and 28th September, 2018 (zoom)

The relative intensities of Balmer lines are always increasing.
For example, the profiles of Halpha and Hbeta lines renormalized around their local continuum are shown below :

TCPJ19544251+17222 (Halpha)

tcpj19544251+17222(normcont)_Halpha_Christophe Boussin.png (43.1 KiB) Viewed 16162 times

TCPJ19544251+17222 (Hbeta)

tcpj19544251+17222(normcont)_Hbeta_Christophe Boussin.png (43.77 KiB) Viewed 16162 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 about the same since September 1st :

TCPJ19544251+17222 (HeII 4686A)

tcpj19544251+17222(normcont)_HeII4686_Christophe Boussin.png (46.74 KiB) Viewed 16162 times

As before, I always detect a double peak for the position that correspond to the Raman OIV line at 6826A...and the relative intensities of these peaks continue to increase :

TCPJ19544251+17222 (Raman OIV 6826A)

The [OIII] lines at 4363, 4959 and 5007A are always undetectable at low resolution but...I think I have seen some changes in the Vend47 spectrum...

First, I note that the relative intensity of the line [OI] at 5577A appears to be increasing since September 15th. Second, a structure appeared in the area near the [FeVI] line at 5677A.
Of course, these potential changes need to be confirmed in the coming days...

TCPJ19544251+17222 ([OI] 5577A and [FeVI] 5677 ?)

Did someone notice something similar?

Clear skies,

Christophe BOUSSIN