spectro-aras.com

Great results
Congratulations to All

V2044 Oph could be promising (He I + He II ?). This is good result on a faint and low target.
I'd suggest to observers further south to get a spectrum with a better SNR

All the best,
François

Bonsoir François,

L'étoile que j'ai faite, c'est V2204 Oph et pas V2044, j'espère que je n'ai pas fait une cible non demandée.

Le problème ce n'est pas d'être plus au Sud, mais d'avoir un très grand arbre plein Sud (bien content de l'avoir quand même en ce moment, car il fait un peu d'ombre).

Hubert

Désolé Hubert,
C'est bien V2204 Oph la cible, une coquile de ma part.

François

Hi
I have taken spectra of EC19249-7343 and V618 Sgr.
V618 Sgr seems to have NaI emission and a very weak Ha emission.
Terry.

Here is my spectrum for V2204 Oph. Its consistent with Hubert's work last week. Apart from Balmer lines, I've noted He I and He II emission lines. This plot has been adjusted for HRV and radial velocity of -428 km/s reported in Simbad for line identification.

Taken with Atik 460EX through a LISA (19 micron slit).

I agree with Hubert - this is faint! I have switched back to unbinned images and the 19 micron slit with a view to tightening up my spectral calibration. I achieved this (hooray!) but at the expense of SNR. It was a full moon and I should be able to improve on this in a week or so. It is very favourably located for me in Aus.

I will send the .fit file to Francois.

Pete

Hi Peter, that's great
You clearly identify the target as a symbiotic star with the He II 4686 line which was suspected but not obvious in Hubert' spectrum.
Thanks to All,
All the best,
François

Spectrum for V1988 Sgr taken last night.

I had a lovely spectrum from 2 October for this one - till I checked the guider image and found I had imaged the wrong star - D'Oh!

Looks like a regular late M star to me. Will email the .fit file to Francois.

Pete

Looks to me that V5590 Sgr is another confirmed symbiotic.

Here is my spectrum from this evening - 7 x 600s unbinned, imaged on an Atik 460EX through a LISA with a 19micron slit.

Plenty of emission lines. Its very faint so there is not much in the way of continuum for this exposure. Will try again tomorrow to confirm

Pete

The last on the list is ASAS J174600-2321.3. Here is my spectrum - 10 x 600s imaged with Atik 460EX with a LISA using a 19 micron slit.

The Ha is clear enough - apart from Na at 5890 and 5895 I can't make anything else out.

The spectrum looks very noisy - ISIS reports a reasonable SNR so something odd is happening here (though it may be my processing). Perhaps another attempt with binned x2 is called for

I will leave this one to the experts to interpret.

Pete

Another spectrum for ASAS J174600-2321.3

This is 9 x 600s and binned x2. The resolution has suffered but the SNR is much better.

I still can't see much more of note in this one. The Ha is obvious and there is a small bump for H beta which was lost in the noise in my image from 6 October 2020. There are a couple of emissions - perhaps - at 5159 [FeVII] and 6364 [OI] though I may be reading too much into this. The Na absorption is clear and likely not related to the target. The spike at 5577 is airglow and can also be ignored.

Pete