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

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

Postby Peter Somogyi » Thu Aug 09, 2018 6:34 pm

If the speculation correct, confirmation and spectroscopy should be urgent:
http://www.cbat.eps.harvard.edu/unconf/ ... 22281.html

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

Postby Paolo Berardi » Thu Aug 09, 2018 9:14 pm

Hi Peter, the fresh spectrum from Italy (luckily clear sky here). Flux calibrated with mean V mag (10.73) during the observation.

Image

Hydrogen and helium emission lines.

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

Postby Peter Somogyi » Thu Aug 09, 2018 9:38 pm

Thank you Paolo for the spectrum! (especially because I cannot shoot this night...)
Looks like a kind of symbiotic outburst.

Robert Fidrich has this newly found variable star ("Vend S955") already on his observing plan for a longer time, here is his light curve:
Vend_S955__asassn_lc__420_50pct.png
Vend_S955__asassn_lc__420_50pct.png (53.12 KiB) Viewed 1049 times


A fresh Vmag is 10.85V (observer: Tamas Tordai) so it may have stopped.

- Peter
EDIT: this light curve is from ASAS-SN
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Re: ASASSN-V J195442.95+172212.6 10.7V mag in Sge

Postby Francois Teyssier » Fri Aug 10, 2018 6:43 am

This is fantastic! Congratulations Paolo !!!! :P
Peter: thank you for the alert and informations
Clearly a symbiotic with He II and perhaps [OIII] (He II is sufficient for symbiotic classification with Balmer lines in emission on a read giant continuum)
The amplitude of the variation before optical outburst is very low for a Mira
I open a page in the data base
Of course, coverage of the event is strongly recommended.
High resolution and Echelle spectra are expected.
Ranges : [OIII] 5007, NIII/CIII 4640 + He II, [Fe VII] 6087 and Raman OVI 6830

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

Postby Francois Teyssier » Fri Aug 10, 2018 8:12 am

Clarification post by Robert Fidrich:
François

Some clarification.

I found this star in outburst during our "Vendégcsillag-kereső" (Gust Star Hunter) nova patrol programme. There was a sudden brightening in a few days - in contradiction of the original semiregular variable (SR) classification based on archives ASAS-SN photometry.

The light curve attached by Peter on the forum was not made by me, but the can be generated/downloaded through the ASAS-SN website:

https://asas-sn.osu.edu/light_curves/75f05b0b-18c4-418d-8218-93030b616a2d
https://asas-sn.osu.edu/light_curves/cdab0df3-ce2f-4a6a-9a4e-4ae1b32f1ca2

So this was originally classified as SR variable - not a Mira.

It's realy exciting to catch a new symbiotic variable in it's firts know outburst.

Thank you for your fast reactions!

Clear skies,

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

Postby Francois Teyssier » Fri Aug 10, 2018 8:41 am

Page opened in the database:
http://www.astrosurf.com/aras/Aras_Data ... +17222.htm

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

Postby Olivier GARDE » Fri Aug 10, 2018 8:48 pm

Weather is good and I'm now on this target with eShel spectrograph.

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 » Sat Aug 11, 2018 1:05 am

A spectrum just taken of the object by using a Ritchey-Chretien 10-inch f/8 and UVEX2 spectrograph associated to an ASI183MM CMOS camera :

Image

Image

Infos up to 3500 A (note the UV jump).

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

Postby Paolo Berardi » Sat Aug 11, 2018 8:24 am

Great spectra!

Yesterday I observed h-alpha line with 2400 l/mm grating (suggested by U. Munari).

Image

Radial velocity:

Image

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

Postby umberto sollecchia » Sat Aug 11, 2018 8:56 am

Bonjour à tous, voici ma contribution en basse résolution. Umberto

tcpj19544251+1722281_20180810_878_Umberto Sollecchia.png
tcpj19544251+1722281_20180810_878_Umberto Sollecchia.png (31.54 KiB) Viewed 797 times
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