Call for monitoring of AG Dra by R. Galis & al.

Francois Teyssier
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Re: Call for monitoring of AG Dra by R. Galis & al.

Post by Francois Teyssier »

Good RI, Christophe
Lines Id. OK, unless [Fe VII]. The yellow giant has low metallicity. Thus no Fe lines (unfortunately!).
But, perhaps, Fe II 5018 during outbursts (at higher resolution)
All the best,
François
Christophe Boussin
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Re: Call for monitoring of AG Dra by R. Galis & al.

Post by Christophe Boussin »

Hello François,
Thank you for these explanations !
Spectroscopically,
Christophe
CBO (Newton 200 F/5 / Alpy600 / Atik 314L+ / Atik Titan + Mewlon 180 F/12 / LHIRES III 2400 / Atik 460EX / Atik 314 L+) @ ARAS database
Francois Teyssier
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Joined: Fri Sep 23, 2011 1:01 pm
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Re: Call for monitoring of AG Dra by R. Galis & al.

Post by Francois Teyssier »

An update.

AG Dra is still in quiescent state (photometry and spectroscopy)
Last results from spectra (Echelle) gathered in ARAS base:
Interesting: the light curve is steady at Mag V ~ 9.7. The EW of the main lines is increasing slowly.
AGDra_EWHR_.png
AGDra_EWHR_.png (9.54 KiB) Viewed 6057 times
AGDra_EWHR_Hbeta.png
AGDra_EWHR_Hbeta.png (8.69 KiB) Viewed 6057 times
AGDra_EWHR_HeII4686.png
AGDra_EWHR_HeII4686.png (8.89 KiB) Viewed 6057 times
AGDra_EWHR_HeI5876.png
AGDra_EWHR_HeI5876.png (8.96 KiB) Viewed 6057 times
AGDra_EWHR_HeI6678.png
AGDra_EWHR_HeI6678.png (8.8 KiB) Viewed 6057 times
AGDra_EWHR_RamanOVI6830.png
AGDra_EWHR_RamanOVI6830.png (11.01 KiB) Viewed 6057 times
Good coverage, Excellent results, thanks to all.
We are undergoing the observations at a low cadency (low and higher resolution).
Even if, this year, the target doesn't produce an outburst event, the data will be very important to produce a baseline (Joroslav's communication).

All the best,
François
Francois Teyssier
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Re: Call for monitoring of AG Dra by R. Galis & al.

Post by Francois Teyssier »

Joroslav's comments:
The behavior of AG Dra is quite interesting. The brightness doesn't seem to change significantly. Absorption in the blue wing of H alpha is still quite prominent. However, EWs are slowly increasing (not only for low excitation lines, for which the changes with the orbital period are expected). As I said previously, we will see how the evolution will continue. Everything is possible, this is a very unusual activity stage.
etienne bertrand
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Re: Call for monitoring of AG Dra by R. Galis & al.

Post by etienne bertrand »

Ma contribution sur cette étoile, spectre prit hier soir :
Image

Image
Christophe Boussin
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Joined: Sun Aug 21, 2016 6:04 pm

Re: Call for monitoring of AG Dra by R. Galis & al.

Post by Christophe Boussin »

Hello all,

Here is my last contribution to the AG Dra monitoring.
I obtained the following spectrum the 4th of May at 22 h 31 TU with my Alpy 600 (resolution of 506, JJ = 2458608.4388) and an acquisition time of 35 min :
AG Dra on May 4th, 2019
AG Dra on May 4th, 2019
_agdra_20190504_939_Christophe Boussin_3700_7570.png (76.96 KiB) Viewed 5963 times
AG Dra on May 4th 2019 (identification from PlotSpectra)
AG Dra on May 4th 2019 (identification from PlotSpectra)
Clear skies,

Christophe BOUSSIN
CBO (Newton 200 F/5 / Alpy600 / Atik 314L+ / Atik Titan + Mewlon 180 F/12 / LHIRES III 2400 / Atik 460EX / Atik 314 L+) @ ARAS database
Francois Teyssier
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Joined: Fri Sep 23, 2011 1:01 pm
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Re: Call for monitoring of AG Dra by R. Galis & al.

Post by Francois Teyssier »

Still quiescent
AGDra_EWHR_RamanOVI6830.png
AGDra_EWHR_RamanOVI6830.png (9.48 KiB) Viewed 5916 times
AGDra_EWHR_HeII4686.png
AGDra_EWHR_HeII4686.png (9.65 KiB) Viewed 5916 times
Only the singlet He I 6678 is sllghtly increasing:
AGDra_EWHR_HeI6678.png
AGDra_EWHR_HeI6678.png (8.47 KiB) Viewed 5916 times
Ongoing observations until late May, the outburst remains possible.

François
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