After a short flare (recorded also by ARAS spectra) CH Cyg is now at a low luminosity.
CH Cyg seems to be doing a very interesting things (at least photometrically).
When will be able to continue with the observations?
Spectroscopic monitoring at high cadency is strongly recommended. CH Cyg is now an easy target during mid-night
François
Message from Margarita Karovska:CH Cygni: still surprizing
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CH Cygni: still surprizing
François Teyssier
http://www.astronomie-amateur.fr
http://www.astronomie-amateur.fr
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Re: CH Cygni: still surprizing
Very low luminosity V ~ 8.6
Impressive changes in a few days.
Na I D emission lines are increasing (very low ionization level) [OIII] region, with He I 5016 and Fe II 5018: H beta in almost pure emission Comments from Margarita Karovska:
the interesting thing is that CH Cyg (V and B) its getting fainter (abruptly) and in a relatively short time period; When this happened in the past, it indicated a jet ejection and dimming of the LC by the ejecta/dust in the inner circumbinary environment. So close spectral and photometric monitoring in the next few months would be of a great interest.
Monitoring of the event at high cadency is strongly recommended
François
Impressive changes in a few days.
Na I D emission lines are increasing (very low ionization level) [OIII] region, with He I 5016 and Fe II 5018: H beta in almost pure emission Comments from Margarita Karovska:
the interesting thing is that CH Cyg (V and B) its getting fainter (abruptly) and in a relatively short time period; When this happened in the past, it indicated a jet ejection and dimming of the LC by the ejecta/dust in the inner circumbinary environment. So close spectral and photometric monitoring in the next few months would be of a great interest.
Monitoring of the event at high cadency is strongly recommended
François
François Teyssier
http://www.astronomie-amateur.fr
http://www.astronomie-amateur.fr
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Re: CH Cygni: still surprizing
Here is my low resolution contribution on CH Cyg from last night using the Shelyak LISA. I have exaggerated the vertical scale. I have attempted to identify the Oxygen, Fe and Nitrogen lines. Do these look correct?
Woody
Woody
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Re: CH Cygni: still surprizing
Hi Woody,
Correct, unless high ionization Fe lines.
CH Cyg is a peculiar symbiotic, powered by accretion and temperature of the hot component ~ 50 000 K (only!).
Most of the lines are low ionized lines (allowed and forbidden) such as Fe, Ti, ...
Cheers,
François
Correct, unless high ionization Fe lines.
CH Cyg is a peculiar symbiotic, powered by accretion and temperature of the hot component ~ 50 000 K (only!).
Most of the lines are low ionized lines (allowed and forbidden) such as Fe, Ti, ...
Cheers,
François
François Teyssier
http://www.astronomie-amateur.fr
http://www.astronomie-amateur.fr
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Re: CH Cygni: still surprizing
Hi Woody,
Here's an identification on your spectrum
I used your spectrum of RX Lep to detect the lines which appears at that resolution
More lines could be identified in the range 5000-5500
Here's an identification on your spectrum
I used your spectrum of RX Lep to detect the lines which appears at that resolution
More lines could be identified in the range 5000-5500
François Teyssier
http://www.astronomie-amateur.fr
http://www.astronomie-amateur.fr
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Re: CH Cygni: still surprizing
Hello all,
Here is my contribution to the monitoring of CH Cyg.
I obtained the following spectrum the 12th of May at 00 h 03 TU with my Alpy 600 (resolution of 503, JJ = 2458615.5027) and an acquisition time of 27 min :
Just to highlight the effect of the resolution on the detection of spectral lines, here is a comparison of the Forrest Sims spectrum (LISA) of CH Cyg with mine (Alpy).
I indicated the position of the same lines identified by François.
Clear skies,
Christophe BOUSSIN
Here is my contribution to the monitoring of CH Cyg.
I obtained the following spectrum the 12th of May at 00 h 03 TU with my Alpy 600 (resolution of 503, JJ = 2458615.5027) and an acquisition time of 27 min :
Just to highlight the effect of the resolution on the detection of spectral lines, here is a comparison of the Forrest Sims spectrum (LISA) of CH Cyg with mine (Alpy).
I indicated the position of the same lines identified by François.
Clear skies,
Christophe BOUSSIN
CBO (Newton 200 F/5 / Alpy600 / Atik 314L+ / Atik Titan + Mewlon 180 F/12 / LHIRES III 2400 / Atik 460EX / Atik 314 L+) @ ARAS database
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Re: CH Cygni: still surprizing
The blue part of CH Cyg spectrum the 15.99/06/2019 at moderate reslolution (UVEX 1200 l/mm) :
Possible significant evolution is I compare to a 16/03/05/2109 spectrum (but a low resolution spectrum, comparison is not easy) :
A tentative for adjust resolution (with caution) :
Christian Buil
Possible significant evolution is I compare to a 16/03/05/2109 spectrum (but a low resolution spectrum, comparison is not easy) :
A tentative for adjust resolution (with caution) :
Christian Buil