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Re: Suspected/Misclassified Symbiotics: spectra required

Posted: Mon Sep 26, 2022 7:40 pm
by JP Nougayrede
Hello tout le monde,

A spectrum of the symbiotic candidate KIC 4918300 that seems to confirm Vincent' observation (his post on 11 sept of this thread)
KIC_guiding_astrometry.jpg
KIC_guiding_astrometry.jpg (212.89 KiB) Viewed 10630 times
KIC4918300_20220926T185333.png
KIC4918300_20220926T185333.png (63.55 KiB) Viewed 10630 times
Bon ciel,
Jean-Philippe

Re: Suspected/Misclassified Symbiotics: spectra required

Posted: Tue Nov 22, 2022 1:57 pm
by 2SPOT
Another symbiotic candidate taken this morning with our setup in Chile

Image

An easy target of magnitude V=12.4 taken with an Alpy 600

Image

Re: Suspected/Misclassified Symbiotics: spectra required

Posted: Tue Dec 06, 2022 3:32 am
by Hamish Barker
HD 306070 is slowly becoming more visible. herewith guider image and spectrum from last night (3x1200s).

Cheers,
Hamish
hd306070-guider.jpg
hd306070_20221205_476_Hamish Barker.png

Re: Suspected/Misclassified Symbiotics: spectra required

Posted: Sat Dec 10, 2022 7:27 am
by Peter Velez
A follow up on Hamish's observation of HD306070.

Two spectra from last night - one taken in the UV, the other in the visual spanning H beta to H alpha. Resolution of around 1000 - taken with UVEX using a 600 lines/mm grating through a Planewave CDK 12.5. Happily - all automated while I slept as it was only observable in the early hours of this morning.

As Hamish's spectrum shows, there is a substantial Ha emission and another, though much smaller at H beta. It may simply be noise but to my eye there is a modest emission in some of the higher energy Balmer lines.

Looking more closely, there appear to be quite a few Fe II emissions as well. The 2 spectra overlap so I was able to confirm that these emissions are not just noise. I've attached an annotated plot of the visual spectrum with the y axis stretched to highlight the emissions. I couldn't find any He I emissions - the bump at 5018 is more likely Fe II than He I at 5015.68.

This target is described in Simbad as an emission-line star (which sounds like a fudge to me) and allocated spectra class B2. This is based on a survey undertaken in 2003. While the continuum may look like a B star, there shouldn't be Fe II emissions. I'll leave it to the experts to interpret this further.

I plan to work in the NIR and IR this evening - will report on anything I find.

Pete

Re: Suspected/Misclassified Symbiotics: spectra required

Posted: Mon Dec 12, 2022 12:09 am
by Peter Velez
v520mon_20221210_514_Peter Velez.png
Another target from the Database - V520 Mon.

This is in the visual range - roughly H beta to H alpha - taken with a UVEX 600 lines/mm grating on a CDK 12.5. I only managed 4 x 600s so its a bit noisy.

Simbad records a spectra type of O9.5-B0Ve and lists it as an X-ray binary. There are healthy He I absorption lines. Both Ha and Hb have a split profile - subplot attached. I'm intrigued by what appears to be an emission at 5878.7 A between the He I line at 5875.6 and the interstellar Na lines. It may just be noise. I plan to have another crack at this one in the next day or so and then move into the UV to see if there is anything interesting there.

Pete

Re: Suspected/Misclassified Symbiotics: spectra required

Posted: Mon Dec 12, 2022 3:41 am
by Hamish Barker
nice, both Balmer profiles seem to show a notch, so I guess that isn't just noise.

Re: Suspected/Misclassified Symbiotics: spectra required

Posted: Tue Dec 13, 2022 3:51 am
by Peter Velez
Another spectrum of V520 Mon - this time in the UV.

Taken with UVEX 600 lines/mm grating on a PW CDK 12.5.

There is nothing particularly remarkable to see. Balmer and He I absorption lines. The H beta line is in emission and, like the spectrum from 10 December, the line is definitely split. I attach a plot of the UV spectrum and a subplot of the H beta line.

Pete

Re: Suspected/Misclassified Symbiotics: spectra required

Posted: Mon Mar 20, 2023 3:46 pm
by 2SPOT
2 others target candidates taken from Chile :

- BK Vir

Image

- V957 Cen

Image

Re: Suspected/Misclassified Symbiotics: spectra required

Posted: Sat May 13, 2023 11:01 am
by 2SPOT
A publication on V618 Sgr

https://arxiv.org/abs/2305.03537

Thanks again to Jaroslav !!!!