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 » Mon Aug 13, 2018 4:59 pm

Comments by Augustin Skopal:

I just had a look at the TCP J1954... spectra in the ARAS database
Spectroscopic features of its current outburst are very similar to
those observed for AG Peg during its 2015 outburst and for AG Dra
outbursts (Balmer jump in emission (!), strong HeII4686 and other Balmer
and HeI lines showing more or less a single peak).

I was very positively surprised with Christian Buil's spectra that
contain rather well defined Balmer jump region - very important for
the symbiotic stars research. Its presence immediately indicates
the nebular emission in the continuum providing a possibility to
determine emission measure, Te, etc.


Keep on the very good job
Still waiting for an AAVSO alert

Christian, après un tel éloge d'UVEX2, tu n'as plus qu'à plancher sur UVEX3 pour aller chercher OIII 3313 A :P

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

Postby Christophe Boussin » Tue Aug 14, 2018 2:24 am

Hello all,

After a very rainy and covered night yesterday...I was able to resume tracking TCPJ19544251+17222 again.
The spectrum below was obtained on August 13 at 21 h 51 TU with a resolution of 504 (JJ = 2458344.4336) and an acquisition time of 65 min (13 x 300 s) :

_tcpj19544251+17222_20180813_911_Christophe Boussin_3700_7570.png
TCPJ19544251+17222 on August 13, 2018
_tcpj19544251+17222_20180813_911_Christophe Boussin_3700_7570.png (104.07 KiB) Viewed 1022 times

The comparison of the spectra obtained on August 11th and 13th with some identified lines :

tcpj19544251+17222_201808_11_13_Christophe Boussin.png
TCPJ19544251+17222 on August 11th and 13th, 2018

tcpj19544251+17222_201808_11_13_Christophe Boussin2.png
TCPJ19544251+17222 on August 11th and 13th, 2018 (zoom)

The Balmer, HeI and HeII lines are clearly visible. Some FeII lines seem to be present in the two spectra as well the [OI] line at 5577A...but [OIII] lines are not visible.

Clear skies,

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 Paolo Berardi » Tue Aug 14, 2018 3:05 pm

Congratulations on all your results!

The 13/08/2018 spectrum, Lhires III 600 l/mm. A slight better resolution (better thermal stabilization of the spectrograph) were reached respect to my last observation. No apparent evolution compared to 11/8 spectrum.

Image

The symbiotic has a new name in VSX: Vend47 (from Vendégcsillag-kereső survey by Róbert Fidrich)

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

Postby Francois Teyssier » Tue Aug 14, 2018 8:34 pm

This light curve ASASSN + Roabert + AAVSO forum:
hbha.PNG
hbha.PNG (10.71 KiB) Viewed 985 times


Abnomalous rise for a classical symbiotic outburst

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

Postby Christophe Boussin » Thu Aug 16, 2018 12:49 am

Hello all,

Thank you very much Paolo ! Congratulations also for your very first spectrum and...the mention of the shorter name of TCPJ19544251+17222 aka Vend47 !!
With weather still so pleasant, I obtained the following spectrum this night, August 15 at 21 h 18 TU with a resolution of 505 (JJ = 2458346.4143) and an acquisition time of 75 min (15 x 300 s) :

_tcpj19544251+17222_20180815_888_Christophe Boussin_3700_7570.png
TCPJ19544251+17222 on August 15, 2018
_tcpj19544251+17222_20180815_888_Christophe Boussin_3700_7570.png (100.47 KiB) Viewed 958 times

The comparison of spectra obtained between August 11 and 15 does not show any obvious evolution at low resolution :

tcpj19544251+17222_201808_11_13_15_Christophe Boussin.png
TCPJ19544251+17222 on August 11th, 13th and 15th, 2018

Nevertheless, it appears (maybe…) to be a slight increase in the relative intensity of the HeII line at 4686A.

tcpj19544251+17222_201808_11_13_15_Christophe Boussin2.png
TCPJ19544251+17222 on August 11th, 13th and 15th, 2018 (zoom)

However, this remark need to be confirmed by new observations...

Spectroscopically,

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 Olivier GARDE » Thu Aug 16, 2018 12:31 pm

My last observation.

The full graph (orders from #30 to #57 merged, I cut the graph below 4200 Å where there was only noise)
Image

I just noticed an evolution on order #48 : NIII CIII HeII 4640 and especially on the Helium II 4640 which tends to widen.
Image
Image

Otherwise the Balmers lines increase in intensity like H gamma
Image
LHIRES III #5, LISA, e-Shel, C14, RC400 Astrosib, AP1600
http://o.garde.free.fr/astro/Spectro1/Bienvenue.html
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Re: ASASSN-V J195442.95+172212.6 10.7V mag in Sge

Postby Christian Buil » Fri Aug 17, 2018 12:09 am

Un temps d'observation très long, mais ca vaut le coup (1200 s en pose élémentaire... quelle est la température de ta caméra ?) !

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

Postby Olivier GARDE » Fri Aug 17, 2018 8:36 am

Christian Buil wrote:Un temps d'observation très long, mais ca vaut le coup (1200 s en pose élémentaire... quelle est la température de ta caméra ?) !

Christian


Christian,

La température de ma CCD est à -10°C (température que je peut obtenir en été car le spectro est dans ma cave à vin régulé en température à 8°C)
LHIRES III #5, LISA, e-Shel, C14, RC400 Astrosib, AP1600
http://o.garde.free.fr/astro/Spectro1/Bienvenue.html
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Re: ASASSN-V J195442.95+172212.6 10.7V mag in Sge

Postby Christian Buil » Sat Aug 18, 2018 12:39 am

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).

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

Postby Tim Lester » Sat Aug 18, 2018 2:26 am

My result for Aug 17. A difficult target for Echelle spectroscopy and conditions were not ideal - very high humidity and haze.

tcpj19544251+17222_20180817_070_tlester_1.png

tcpj19544251+17222_20180817_070_tlester_2.png

tcpj19544251+17222_20180817_070_tlester_3.png


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