spectro-aras.com

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

Hello Jaroslav,

We try do to it today or next night from Chili

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

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

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....

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



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

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

Peter Velez wrote:The Balmer line emissions look redshifted.
Pete

yes you're right, the Balmer's line are shifted about 140km/s

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

Hi All
I took a spectrum of this target last night using my LISA R=1600.
Cheers
Terry