Outburst of SS73 141

Jaroslav Merc
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Outburst of SS73 141

Post by Jaroslav Merc »

Information from Róbert Fridrich in FB Group "PACA_Transients":

Symbiotic nova eruption or 'just' classic (ZAND-type) symbiotic outburst of SS73 141?
Tadashi Kojima, who detected (see vsnet-alert 26105) the recent eruption/outburst requests further observations.
Spectroscopic follow-up is urgently needed!

ASAS-SN Light Curve: https://asas-sn.osu.edu/sky-patrol/coor ... 331aabca4a
2SPOT
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Re: Outburst of SS73 141

Post by 2SPOT »

Hello Jaroslav,

We try do to it today or next night from Chili
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Peter Velez
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Re: Outburst of SS73 141

Post by Peter Velez »

The weather has turned nasty in Eastern Australia - unlikely to clear before Friday. I’ll do what I can when the weather clears.

The 2SPOT guys will doubtless have better weather in the Atacama.

Pete
Peter Velez
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Re: Outburst of SS73 141

Post by Peter Velez »

OK - I didn't appreciate how much of a challenge this target would be. When I read "outburst" I thought it would be nice and bright - I should have checked the light curve!

The last ASAS-SN record has it at mag 13.3 in the g band last Sunday. My UVEX grating is currently centred at around 4500 A and as this is a symbiotic, there isn't much continuum to work with. So its really at the edge of what I can do with this set up.

Here is a crop of my spectrum - the noise above 4000A makes this section unusable. The SNR in the red gets as high as 20 and almost breaks 10 in the UV so treat this with caution.

Taken with a UVEX 600 lines/mm grating on a PW CDK 12.5. Just over 2.5 hours.

I have annotated what I can. The He I at 4921.9 A looks like a blend with Fe II at 4923.9 A - I didn't mark both as the graph becomes hard to read.The Balmer line emissions look redshifted. I'm reasonably comfortable with the calibration on this one so I can't explain why this might be the case. If I adjust the spectrum to match the Balmer lines, the He I lines are then off. Will leave that to the gurus to explain. Not as much Fe II as I would have expected - but its hard to tell with all the noise.

I plan to have another crack at RS Oph tonight and so will leave the grating where it is for now. I don't think this target is changing rapidly. I'll move to the red in a day or two and will then try again.

Comments - as always - are most welcome

Pete
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ss73_141_20210825_415_Peter Velez.png
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Re: Outburst of SS73 141

Post by 2SPOT »

Hi Pete,

Yes it"s a challenge to take this target...

I just finish it from Chile, now i upload the files to process it.
The result as soon as possible....
2SPOT : Southern Spectroscopic Project Observatory Team
Website : http://www.2spot.org - Observatory Site : Deep Sky Chile https://www.deepskychile.com/fr/
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2SPOT
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Re: Outburst of SS73 141

Post by 2SPOT »

Here's our spectrum taken this morning with an Alpy 600 and RC12.
Not a very simple target... Around mag 13.3

Here's the auto guiding field

Image

and the graph which shows the Balmer lines and others very weak lines

Image
2SPOT : Southern Spectroscopic Project Observatory Team
Website : http://www.2spot.org - Observatory Site : Deep Sky Chile https://www.deepskychile.com/fr/
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Francois Teyssier
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Re: Outburst of SS73 141

Post by Francois Teyssier »

Page opened in the database: https://aras-database.github.io/database/ss73141.html
Of course a monitoring of the outburst is encouraged (along to that of AR Pav)

François
Last edited by Francois Teyssier on Thu Aug 26, 2021 12:19 pm, edited 1 time in total.
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Re: Outburst of SS73 141

Post by 2SPOT »

Peter Velez wrote:The Balmer line emissions look redshifted.
Pete
yes you're right, the Balmer's line are shifted about 140km/s
2SPOT : Southern Spectroscopic Project Observatory Team
Website : http://www.2spot.org - Observatory Site : Deep Sky Chile https://www.deepskychile.com/fr/
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Jaroslav Merc
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Re: Outburst of SS73 141

Post by Jaroslav Merc »

Hi everyone,

great job, congratulation on the spectra of the challenging target! Overall, it seems, that it is the outburst of a classical symbiotic star (Z And-type), not a slow symbiotic nova. I have compiled an ATel in that sense: https://www.astronomerstelegram.org/?read=14874. I think it would be useful to keep an eye on the target in the following months to check the photometric and spectroscopic evolution.

Jaroslav
Terry Bohlsen
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Re: Outburst of SS73 141

Post by Terry Bohlsen »

Hi All
I took a spectrum of this target last night using my LISA R=1600.
Cheers
Terry
ss73141_20210909_515_TBohlsen.png
Terry Bohlsen
Armidale NSW
Australia
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