spectro-aras.com

An attempt on this enigmatic star with eShel at R = 11000
V mag ~ 11.5

François

V Sge from last night, with my new 300/1200 Newton:
HeII 4686 / H-beta ratio jumped to 2:1, as I see. Inserting to my daily list...

Happy hunting!
Peter

That's great !
Very impressive changes in only a few days
R = 2500 is suffisent to get the profile
A (almost) daily coverage should be great this summer
François

Change since previous night, approx. 1 hour (6 * 600 sec) exposures each:
Had to fix a 'wavelength registration' error manually from yesterday (estimated skews were nonlinear and first far from zero), fortunately made a safety last calibration frame and interpolated the shift by producing weighted average calibration frames. (Approx. 1.5 A skew introduced.)

Another local effect could be, that this time unusual gaps appeared left to H-alpha (local fog?) visible on both 29-Vul and 1-Sge (= safety ref.star, to confirm 29-Vul) taken at the same time, it should be wise to do a telluric calibration around H-alpha to see the full truth. (Can send the ref.stars upon request, or I can try it later...)

Blue part looks free of errors:
Further increase at HeII 4686 blue wing.

Peter

A very long exposure of 8 x 1200 sec at R = 6400.
S/N not as good as I had hoped for. Tim

Hello,

I move this post here in order to merge all the spectra.

Yesterday I took a new spectrum and has changed considerably from the very early days of July. Even at low resolution the changes are very clear.

Another curious feature is that continuum increases at low wavelenghts.

Meanwhile, the big question is... what's going on in V Sge? It is maybe a microquasar like V694 Mon or SS433? I have never seen a spectrum like this...

Greetings
Fran

All that is excellent and very exciting
I opened a page in the base : http://www.astrosurf.com/aras/Aras_Data ... e/Vsge.htm
Waiting for your (good spectra)

V Sge ( and from it V Sge stars) is an enigmatic star, with a period of ~ 0.5 day and strong eclipses
I'll write a resume from publications

François

Yesterday could catch only 2 x 900 sec usable exposures (out of the many...), and just for the blue region:
Above 2 charts comparing yesterdays result to the previous days, showing the full weekend serie.
Suggests the wings might change suddenly.

The most useful description I saw is opening from vsx:
https://www.aavso.org/vsx/index.php?vie ... &oid=27346
See the doc from 1965, however I was unable to access the real content from 1983.

Peter

Spectre très intéressant. Les raies en émission sont larges et très nombreuses ; serait-il possible d'avoir des informations qui expliquent le spectre ?
Merci pour ce bon travail.

Halpha for July 27 at R = 9000. (H2O removed)
Tim