AG Dra brightening
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Re: AG Dra brightening
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
We're waiting to find out what's going on the symbiotic system...
Paolo
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Re: AG Dra brightening
Currently on it.
He II remains very intense (about 1.4 x Hb)
Confirmed, Peter :
Raman OVI has vanised
François
He II remains very intense (about 1.4 x Hb)
Confirmed, Peter :
Raman OVI has vanised
François
François Teyssier
http://www.astronomie-amateur.fr
http://www.astronomie-amateur.fr
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Re: AG Dra brightening
A pdf showing the evolution of the lines :
http://www.astronomie-amateur.fr/Result ... a-2016.pdf
François
http://www.astronomie-amateur.fr/Result ... a-2016.pdf
François
François Teyssier
http://www.astronomie-amateur.fr
http://www.astronomie-amateur.fr
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Re: AG Dra brightening
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:
(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
Indeed, the 1st Raman drop to a half has happened within but a few exposures, here is how it looks:
(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
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Re: AG Dra brightening
Impressive behaviour!
Sky offer sometimes suprises.
Benji
Sky offer sometimes suprises.
Benji
Spcaudace spectroscopy software: saving you hundred hours of frustration.
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Re: AG Dra brightening
Wow, that's fast. A great catch Peter. Having such detailed measurements of a fast change like that must be unusual.
Cheers
Robin
Cheers
Robin
LHIRES III #29 ATIK314 ALPY 600/200 ATIK428 Star Analyser 100/200 C11 EQ6
http://www.threehillsobservatory.co.uk
http://www.threehillsobservatory.co.uk
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Re: AG Dra brightening
That's impressive Peter.
I forward the congratulations from Steve.
François
I forward the congratulations from Steve.
François
François Teyssier
http://www.astronomie-amateur.fr
http://www.astronomie-amateur.fr
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Re: AG Dra brightening
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
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
- Attachments
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- AG Dra 20160425%2C021.png (49.25 KiB) Viewed 7490 times
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- comparison AG Dra.png (63.2 KiB) Viewed 7490 times
Last edited by Paolo Cazzato on Tue Apr 26, 2016 6:59 am, edited 1 time in total.
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Re: AG Dra brightening
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
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
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Re: AG Dra brightening
Hello Paolo,
As I see, the Raman OVI seem to be coming back!
Looks it needs to continue to follow!
- Peter
As I see, the Raman OVI seem to be coming back!
Looks it needs to continue to follow!
- Peter