CH Cyg session 2018.06.30

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CH Cyg session 2018.06.30

Postby Peter Somogyi » Sat Jun 30, 2018 10:27 am

Hello all,

As per aavso, CH Cyg is fading suddenly (see the light curve).
I have fully clear forecast for todays very short night, would like to get parallel coverage, chosing the optimal observing schedule plan.
My default plan:
- CH Cyg at R~13000, H-alpha (LHires 2400/mm, 35u slit, max 15 min if no relevant fluctuation, need to have the same time cover with H8)
- CH Cyg in the UV (Ca II region, 1 hour, maybe more if seeing rapid changes / too low snr)
- VV Cep in the UV
+ perhaps something else if fits

I'd appreciate if anyone could provide low resolution coverage (blue oriented, let the H-alpha burn in), e.g. LISA or Alpy in parallel.

If anyone have ability to observe CH Cyg H-alpha above R~10000 (or eventually an eShel), I'd likely skip this.

Cheers,
Peter
Peter Somogyi
 
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Re: CH Cyg session 2018.06.30

Postby Vincent Marik » Sat Jun 30, 2018 6:13 pm

Hello,

Ok, I have a clear forecast to at Tours.
I'll try CH cygni tonight with Alpy

Clear sky
Vincent Marik
VMA/ TRS-FR/ T 200/ Alpy/ Atik 314L+
Vincent Marik
 
Posts: 27
Joined: Fri Aug 17, 2012 1:00 pm
Location: Tours (France)

Re: CH Cyg session 2018.06.30

Postby Peter Somogyi » Sat Jun 30, 2018 7:31 pm

Thank you Vincent! Alpy's blue end will be an important addition! - Peter
Peter Somogyi
 
Posts: 338
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Re: CH Cyg session 2018.06.30

Postby Vincent Marik » Sun Jul 01, 2018 8:45 am

Hello,

This is the result
CH cygni. Expect this is usefull !

Vincent
Attachments
_chcygni_20180630_958_marik.png
_chcygni_20180630_958_marik.png (7.34 KiB) Viewed 762 times
VMA/ TRS-FR/ T 200/ Alpy/ Atik 314L+
Vincent Marik
 
Posts: 27
Joined: Fri Aug 17, 2012 1:00 pm
Location: Tours (France)

Re: CH Cyg session 2018.06.30

Postby Peter Somogyi » Sun Jul 01, 2018 2:49 pm

Hello Vincent!

Visually, your spectrum seem to match well with hd207076.
Here is my spec. compared to a miles M7III star (my resolution is R~5500 average - considerably higher than the miles), suspecting a similar event:
chcyg_uv_cmp_hd207076.png
chcyg_uv_cmp_hd207076.png (22.04 KiB) Viewed 739 times

Unfortunately, I will need to wait for a good sky again (= one of the next weekends unless anyone provide...) to catch an M7III star for substraction and calculate the precise M7III ratio, allowing to extract other features as well.
But, it looks roughly almost the whole Be comp. light has just been lost.

BTW I am speculating about this, though it's a tricky system and need to be very careful (at least wait 1-2 weeks to judge):

Title: Eclipses in the symbiotic system CH CYG
Authors: Skopal, A., Bode, M. F., Lloyd, H. M., & Tamura, S.
13 Feb 1996

http://adsabs.harvard.edu/full/1996A%26A...308L...9S

3.1 Eclipses in the inner binary
[...] 1967-1970, 1992-1995 (Fig1) [...]

Cheers,
Peter
Peter Somogyi
 
Posts: 338
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Re: CH Cyg session 2018.06.30

Postby Peter Somogyi » Sun Jul 01, 2018 3:04 pm

Forgot to add, processed all my UV spectra relative to Iot Cyg, and the drop is obvious (with M-ish features on top remained):
chcyg_uv_cmp3_ps_iotcyg.png
chcyg_uv_cmp3_ps_iotcyg.png (66.02 KiB) Viewed 729 times

So it is showing better what I wanted to point out.

- Peter
Peter Somogyi
 
Posts: 338
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