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

Information about outbursts of eruptive stars, Be activity, ...
Post Reply
Christian Buil
Posts: 1431
Joined: Mon Sep 26, 2011 6:59 pm
Contact:

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

Post by Christian Buil »

VHIRES-MO spectrum (R=48000) at high SNR (11 x 600 sec. exposure under good conditions) on C11 taken the 19.8 May.

Detail of Raman OIV line:

Image

H alpha line (after H2O telluric removed):

Image

He I line (fines structures evolution):

Image

He II line (increase in intensity):

Image

Christian Buil
Peter Somogyi
Posts: 420
Joined: Sun Jul 13, 2014 8:56 am

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

Post by Peter Somogyi »

Hello, here is my extracted result about variability of EWs on in the red part (same night as others already reported 05.17-18):
extracted AG Dra EWs
extracted AG Dra EWs
AGDra_pso_20170517_EWs.png (28.18 KiB) Viewed 6621 times
This graph is showing error bars, calculated by EWs of conitnuum itself near to it at the same length of selected region, using the stddev formula for the overall result (all scripted via IRAF).
Got 0.15 for the Raman OVI 6825, and between 0.8-0.11 for the other lines (H-alpha is special here: division by 10 except the error).
Exposures was taken of 10 -> 8 -> 5 minutes decreasing in the 2nd half of the night (after scope turnover + took other bands spectra).
This reduction was due to H-alpha started to have a pixel reaching the max ADU on the ccd.
All in all, Raman profiles flicker by 10% during a night, shorter integration times are meaningful!

Cheers,
Peter
Olivier GARDE
Posts: 1243
Joined: Thu Sep 29, 2011 6:35 am
Location: Rhône Alpes FRANCE
Contact:

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

Post by Olivier GARDE »

Evolution of Ag Dra in 4 days

The full spectrum
Image

H Alpha(corrected for heliocentric velocity)
Image

Raman OIV (corrected for heliocentric velocity)
Image
LHIRES III #5, LISA, e-Shel, C14, RC400 Astrosib, AP1600
http://o.garde.free.fr/astro/Spectro1/Bienvenue.html
umberto sollecchia
Posts: 242
Joined: Tue Dec 30, 2014 3:25 pm

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

Post by umberto sollecchia »

Bonjour, voici le profil de l'observation de la nuit 21/05/2017.
Profilo Ag Dra.png
Profilo Ag Dra.png (8.2 KiB) Viewed 6593 times
Umberto
Michel Verlinden
Posts: 191
Joined: Tue Aug 16, 2016 12:11 am

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

Post by Michel Verlinden »

Dear all,
How impressiv are your spectra ! C'est fantastique. Olivier, tes spectres en très haute résolution sont incroyables.
J'ai un problème:
I can't saturate Halpha line with my small 200 mm Celestron and my 460EX Atik camera in binning 1x1 mode in 20 minutes. But I took spectra of AG Dra with 1200s exposure time. I show you my results (blue profil) in low resolution (Alpy 600 spectrograph), compared with 8x600s last month (black profil). Will I have more details in the blue part in binning 2x2 mode ?
For the blue plot: 8 x 1200s, R= 592 - HD145454 (A0Vs) is my reference star (not my favorite star...A joke).
I'm not sure about the identity of some emission lines (Calcium or some Balmer lines...Or blended lines ?)
Thank you for comments.
Cheers,
Michel Verlinden
Attachments
agdrab_20170521_000_Michel Verlinden.png
Francois Teyssier
Posts: 1520
Joined: Fri Sep 23, 2011 1:01 pm
Location: Rouen
Contact:

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

Post by Francois Teyssier »

Thanks to all for the very coverage and the quality of the spectra.

It looks like the event is already finished. Very weak and very short.
AGDra_AAVSO.PNG
AGDra_AAVSO.PNG (7.83 KiB) Viewed 6582 times
Of course, we go on the good job!

François
Christian Buil
Posts: 1431
Joined: Mon Sep 26, 2011 6:59 pm
Contact:

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

Post by Christian Buil »

AG Dra low resolution spectrum taken the 20.89/05/2017 (C11 + Lhires III 150 g/mm):

Image

Image

Christian Buil
Francois Teyssier
Posts: 1520
Joined: Fri Sep 23, 2011 1:01 pm
Location: Rouen
Contact:

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

Post by Francois Teyssier »

An update from Rudolf Galis:
The recent activity of AG Dra looks really strange. After promising increase of its brightness (around 0.1 mag/day in B filter), the magnitude stopped to raise and it is almost at same level as before this event, now. The event recalls the pre-outburst in 2015 with maximal brightness around 10.7 mag in B filter. Is this event another pre-outburst, as we have already recorded in the photometric history of AG Dra? There is still a chance for main outburst: if we assume that the last outburst occurred around JD 2 457 517 and the time interval between outbursts of AG Dra varies from 300–400 days, the outburst window is open until June 12, 2017. Another possibility is that AG Dra will return to quiescence stage as we have already detected such behaviour during the weak activity stage 1963–66.
In any case, I suggest to continue with daily monitoring of AG Dra at least to mid of June. Subsequently, we would redefine the observational schedule of AG Dra. Thank you for your cooperation.

Rudolf Gàlis


Let'us go on the good job
Thanks to all
François
Jacques Montier
Posts: 242
Joined: Sun May 13, 2012 2:46 pm

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

Post by Jacques Montier »

Hello all

AG Dra spectra the 2017/05/24.980

Meade ACF 355mm f/d 7 + Alpy600 + Atik460EX
20170525-agdra-double-ech.png
20170525-agdra-double-ech.png (76.53 KiB) Viewed 6482 times
20170525-agdra-flux-v2.png
20170525-agdra-flux-v2.png (39.88 KiB) Viewed 6482 times
Cheers,
--
Jacques Montier
Societe d'Astronomie de Rennes
IAU code J23
Francois Teyssier
Posts: 1520
Joined: Fri Sep 23, 2011 1:01 pm
Location: Rouen
Contact:

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

Post by Francois Teyssier »

Echelle spectra after the weak burst
agdra_ha.png
agdra_heII.png
He I 5875
agdra_heI5875.png
agdra_HeI6678.png
agdra_ovi.png
François
Post Reply