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

[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]

Hello François,
Thank you for these explanations !
Spectroscopically,
Christophe

[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 (9.54 KiB) Viewed 8447 times

AGDra_EWHR_Hbeta.png (8.69 KiB) Viewed 8447 times

AGDra_EWHR_HeII4686.png (8.89 KiB) Viewed 8447 times

AGDra_EWHR_HeI5876.png (8.96 KiB) Viewed 8447 times

AGDra_EWHR_HeI6678.png (8.8 KiB) Viewed 8447 times

AGDra_EWHR_RamanOVI6830.png (11.01 KiB) Viewed 8447 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]

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]

Ma contribution sur cette étoile, spectre prit hier soir :

[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

_agdra_20190504_939_Christophe Boussin_3700_7570.png (76.96 KiB) Viewed 8353 times

AG Dra on May 4th 2019 (identification from PlotSpectra)

Clear skies,

Christophe BOUSSIN

[Francois Teyssier]

Still quiescent

AGDra_EWHR_RamanOVI6830.png (9.48 KiB) Viewed 8306 times

AGDra_EWHR_HeII4686.png (9.65 KiB) Viewed 8306 times

Only the singlet He I 6678 is sllghtly increasing:

AGDra_EWHR_HeI6678.png (8.47 KiB) Viewed 8306 times

Ongoing observations until late May, the outburst remains possible.

François