Dramatic change of H alpha profile

[Olivier Thizy]

Interesting as we have been observing the same target last night - a good way to compare our results... and lot of work for the ARAS database administrator François Teyssier!... specially as we have time series (and time seems very critical on CH Cygni with changes within minutes!) and for the eShel spectrograph data we have a large spectral domain with multiple orders... not easy to handle. Have a thought for him!

Looking forward for the OHP spectroscopy workshop where people there will certainly talk about CH Cygni and those changes!...

Cordialement,
Olivier Thizy
http://observatoire-belle-etoile.blogspot.fr/

[Miguel Rodriguez]

Here is my last spectrum from tonight.
Unfortunately I don't have enough time span to monitor profile changes through the night.

[Olivier Thizy]

Hello,


a single shot tonight as I didn't want to return the mount and reached the limits. But it shows some changes from your spectrum:

CH Cygni preview.JPG (83.42 KiB) Viewed 18468 times

Cordialement,
Olivier Thizy
http://observatoire-belle-etoile.blogspot.fr/

[Francois Teyssier]

AAVSO Light Curve

General trend : decreasing since the beginning of June

CHCyg.png (10.59 KiB) Viewed 18448 times

Results from 29th and 30th of july :

_chcyg_20150729_865_full_HaHbHg.png (14.7 KiB) Viewed 18448 times

_chcyg_20150730_873_full_HaHbHg.png (15.64 KiB) Viewed 18448 times

About lines formation :

- CH Cyg : Introduction to CH Cyg campaign by Dr A. Skopal : http://www.astrosurf.com/aras/novae/Inf ... 015-01.pdf
- Symbiotics : Several texts from Dr S. Shore :
http://www.astrosurf.com/aras/novae/Inf ... 3-2014.pdf

François Teyssier

[Miguel Rodriguez]

Spectrum from two hours observation.

[Olivier Thizy]

Here is an animation (done with SPLAT-VO tool) of CH Cygni Halpha recorded tonight over two hours with C11 + eShel + ST1603:

CHCygni.gif (599.96 KiB) Viewed 18395 times

Cordialement,
Olivier Thizy
http://observatoire-belle-etoile.blogspot.fr/

[Nico Montigiani]

Hi to all.
Here is our animation of CH Cygni H alpha line rocorded at the night of 02 Aug 2015 over 2 hours.
Instumentation: Meade SC 10"f/10 + Lhires III 1200 l/mm + CCD SBIG ST10XME
Time of single exposition: 600 min

CH Cyg - 02/08/2015 - Associazione Astrofili Fiorentini

CHCyg_anim.gif (74.22 KiB) Viewed 18379 times

Clear sky
Nico Montigiani
Massimiliano Mannucci
Lapo Ferrini
Associazione Astrofili Fiorentini A.A.F., Florence, Italy (mpc code 632)

[Francois Teyssier]

Nice Nico ! You can send me the spectra.

CH Cyg to night
Almost constant

chcyg_ha_20150805.png (17.35 KiB) Viewed 18371 times

François

[Olivier GARDE]

A time serie spectra taken just after Olivier Thizy sequence.
3H30 long : A total of 71 spectra of 180s each with eshal spectrograph.

I have also the same animation for H beta and H gamma

[Olivier Thizy]

Here is an animation of the night of august 6th and one from last night (data reduction in ISIS, animation in SpecAudace with 'norma' option):

CH_Cygni_20150806_anim.gif (371.44 KiB) Viewed 18318 times

CH_Cygni_20150807_anim.gif (375.43 KiB) Viewed 18318 times

Equipment: C11 + eShel


Cordialement,
Olivier Thizy
http://observatoire-belle-etoile.blogspot.fr/