CH Cyg 2018

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Re: CH Cyg 2018

Postby Vincent Bouttard » Fri Jul 20, 2018 5:00 pm

Hi all,

Please find my contribution to this topic with a low resolution spectrum taken during the last OHP workshop.
20x30s with Alpy600 spectrograph on 250 mm F/4 Newtonian telescope.

Vincent
Attachments
CH_Cyg_20180716_071.png
CH_Cyg_20180716_071.png (5.42 KiB) Viewed 167 times
VBO @ ARAS database : Newtonian 250 mm F/4 / Alpy600 / Atik 460EX
Vincent Bouttard
 
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Re: CH Cyg 2018

Postby Vincent Bouttard » Thu Jul 26, 2018 7:50 am

Hello

CH Cyg last night. 20 x 30s with Alpy600 on 250 F/4 Newtonian telescope (I've made a mistake on the title of this image about the exposure time).

CH_Cyg_20180725_882.png
CH_Cyg_20180725_882.png (5.25 KiB) Viewed 145 times
VBO @ ARAS database : Newtonian 250 mm F/4 / Alpy600 / Atik 460EX
Vincent Bouttard
 
Posts: 37
Joined: Sun Oct 02, 2011 11:09 am
Location: Colmar (France)

Re: CH Cyg 2018

Postby Francois Teyssier » Thu Jul 26, 2018 5:14 pm

CH Cyg returns to its previous luminosity
CHCyg2.PNG
CHCyg2.PNG (6.77 KiB) Viewed 120 times


Last Echelle spectra:
http://www.astrosurf.com/aras/Aras_DataBase/Symbiotics/CHCyg.htm
CHCyg3.PNG
CHCyg3.PNG (40.55 KiB) Viewed 120 times


Of course, we undergo high cadency monitoring until the return to previous state

François
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Re: CH Cyg 2018

Postby Peter Somogyi » Thu Jul 26, 2018 7:14 pm

Hello Francois,

I think the H-beta is considerably affected by the B component's flux level - hence can be mixed by a similar absorption that's prominent clearly in the UV:
chcyg_pso_0526_0720_h8vel.png

The green line is my new observation, unfortunately got bad weather here and can't shoot for 1-2 weeks.
What I suspect, the jet in the line of sight is precessing towards the 0 km/s vrad (maybe approached it by now).

I'd rather recommend looking at the sudden EW(H-alpha) drop happening since 07.12 - that's what the daily spectra show in the database, just cannot graph so many data.

Cheers,
Peter
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