Suspected/Misclassified Symbiotics: spectra required

[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 (212.89 KiB) Viewed 3406 times

KIC4918300_20220926T185333.png (63.55 KiB) Viewed 3406 times

Bon ciel,
Jean-Philippe

[2SPOT]

Another symbiotic candidate taken this morning with our setup in Chile



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

[Hamish Barker]

HD 306070 is slowly becoming more visible. herewith guider image and spectrum from last night (3x1200s).

Cheers,
Hamish

[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

[Peter Velez]

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

[Hamish Barker]

nice, both Balmer profiles seem to show a notch, so I guess that isn't just noise.

[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

[2SPOT]

2 others target candidates taken from Chile :

- BK Vir



- V957 Cen

[2SPOT]

A publication on V618 Sgr

https://arxiv.org/abs/2305.03537

Thanks again to Jaroslav !!!!