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 367 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 345 times
VBO @ ARAS database : Newtonian 250 mm F/4 / Alpy600 / Atik 460EX
Vincent Bouttard
 
Posts: 40
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 320 times


Last Echelle spectra:
http://www.astrosurf.com/aras/Aras_DataBase/Symbiotics/CHCyg.htm
CHCyg3.PNG
CHCyg3.PNG (40.55 KiB) Viewed 320 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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Re: CH Cyg 2018

Postby James Foster » Mon Sep 03, 2018 2:38 pm

Here is what I got on CH Cyg last week using the LhiresIII with a 1800 l/mm grating with 35 micron slit:
Image
I'll try getting it at CaK and Hb when the clouds go away!

Sincerely Yours,

James Foster
Los Angeles, CA
James R. Foster
Lhires III (2400 & 1800 ln/mm Grat) Spectroscope,
LISA Visual & IR Kit Spectroscope,
Alpy 600, and Star Analyzer 200
James Foster
 
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Re: CH Cyg 2018

Postby Peter Somogyi » Sun Sep 16, 2018 12:20 pm

CH Cyg went into a blue minima again (see aavso).
By fortune with yesterday session, I've got 2 spectra close by 1 week showing high & low state having their own flux (using the wide slit, ref.: Vega/calspec):
chcyg_high_and_low_20180915.gif
chcyg_high_and_low_20180915.gif (54.33 KiB) Viewed 61 times

Included my spectrum on 2018.07.07 which was in the middle of the earlier minima.
I am curious what is causing these events.
Peter
Peter Somogyi
 
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Re: CH Cyg 2018

Postby James Foster » Mon Sep 17, 2018 9:48 am

To: Peter,

RE:"...I am curious what is causing these events."
Not sure about this myself, but here is my LhiresIII CaK data using the 1800 m/ln grating and 35micron slit (08Sep18) in the same near UV region:

Image

Here is a 2D i did to more clearly see the processed Isis 2D _CH CygCaK.fits file via PS motion blur filter.

Image

Let me know if you see anything strange here, as the short end of the spectrum sometimes does not "line-up" with the H-lines like the center and high end do.

James
James R. Foster
Lhires III (2400 & 1800 ln/mm Grat) Spectroscope,
LISA Visual & IR Kit Spectroscope,
Alpy 600, and Star Analyzer 200
James Foster
 
Posts: 242
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