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Re: AG Dra brightening
Posted: Sat Apr 23, 2016 9:17 pm
by Paolo Berardi
Hi Peter, thanks for the alert. My last observation dates back to 19 april (see below), unfortunately current weather and forecast are very bad.
We're waiting to find out what's going on the symbiotic system...
Paolo
Re: AG Dra brightening
Posted: Sat Apr 23, 2016 9:27 pm
by Francois Teyssier
Currently on it.
He II remains very intense (about 1.4 x Hb)
- AGDra1.PNG (99.73 KiB) Viewed 7672 times
Confirmed, Peter :
Raman OVI has vanised
- _agdra_20160423_890_full_Raman OVI_dec.png (22.91 KiB) Viewed 7668 times
François
Re: AG Dra brightening
Posted: Sun Apr 24, 2016 5:10 pm
by Francois Teyssier
Re: AG Dra brightening
Posted: Sun Apr 24, 2016 6:35 pm
by Peter Somogyi
Thanks for the confirm, Francois!
Indeed, the 1st Raman drop to a half has happened within but a few exposures, here is how it looks:
- title_Raman12_x6_y4.png (22.9 KiB) Viewed 7612 times
(generated by a trivial flux measure in IRAF (6804:6847, 7066:7100) splot/'e' tool, rectified to a stable 2nd order continuum)
The last 5 exposures had 20 minute, all others 10 minute.
Peter
Re: AG Dra brightening
Posted: Sun Apr 24, 2016 7:02 pm
by Benjamin Mauclaire
Impressive behaviour!
Sky offer sometimes suprises.
Benji
Re: AG Dra brightening
Posted: Mon Apr 25, 2016 10:20 am
by Robin Leadbeater
Wow, that's fast. A great catch Peter. Having such detailed measurements of a fast change like that must be unusual.
Cheers
Robin
Re: AG Dra brightening
Posted: Mon Apr 25, 2016 5:00 pm
by Francois Teyssier
That's impressive Peter.
I forward the congratulations from Steve.
François
Re: AG Dra brightening
Posted: Mon Apr 25, 2016 8:59 pm
by Paolo Cazzato
Hallo everybody,
these are my first low resolution spectrum here on aras group. I did theme using an alpy600 coupled with a 200 mm newton telescope. I attached the last spectrum of AG Dra made this night and a comparison made to show some changes in He and O VI spectrum lines
Re: AG Dra brightening
Posted: Mon Apr 25, 2016 9:38 pm
by Peter Somogyi
Thank you all.
Maybe the material falling in has suddenly changed or depleted? Remember, it's a small feature, and the drop was only partial.
The gnuplot extract above is via my quickly written script using IRAF (yet too fresh, working on to stabilize), but the change is well seen in spectra uploaded in the database
I must confess taken a calibration right at the drop, have caught only 1 frame clearly in the middle state - but similarly low Raman features can be generated even with the previous calibration, and other features seem to mostly unchanged.
Let's see how it continues.
Peter
Re: AG Dra brightening
Posted: Mon Apr 25, 2016 9:42 pm
by Peter Somogyi
Hello Paolo,
As I see, the Raman OVI seem to be coming back!
Looks it needs to continue to follow!
- Peter