AAVSO Alert Notice 454: Monitoring of CH Cyg requested

[Olivier GARDE]

Voici l'évolution de CH Cyg entre le 25 et 27 mars dernier. Le spectre réalisé avec le LISA ne permet guère de voir avec finesse les détails de l'évolution de la raie Halpha, mais l'on voit tout de même une évolution....

[Christian Buil]

Update of CH Cyg page campaign with latest observations (inform me for any problem):

http://www.astrosurf.com/aras/surveys/chcyg/index.html

... in fact I have a serious problem... the Astrosurf ARAS count seem to be out of allocated memory!

First consequence, I can not propose for the moment download my sequence of 102 spectra taken
the 25/03/2012 with a C11 + Lhires III 600 g/mm at time resolution of 120 seconds (the zipped file size
is 1Mo).

Only here a graphical representation of th observation. For each observation date I have
computed the difference of actual spectral observation and the mean of all observtations
(102 spectra). ISIS contain all functions for compute this:



We can note some probable short term variations of Halpha line intensity (some percent) - to be confirmed after comparison with obsrervations taken at the same date.

I contact the Astrosurf webmaster (J. P. Cazard) for increase the ARAS memory volume capacity...

Christian Buil

[Thierry Garrel]

Hello Robin,
I have dozens of observations until March 28. I gone put a link on ARAS webpage.
The weather has turning bad after this date and technical problem appeared with scope DEC. Fix now but the weather is still bad.

T

[Christian Buil]

I have updated the CH Cyg ARAS page with new observations of Robin (April 5) and my proper observation for the May 24 (reprocessed):

http://www.astrosurf.com/aras/surveys/chcyg/index.html

Here, a plot of my 35 spectra taken the 24/03/2012 with a time resolution of 180 sec. For clarity the plot
are shifted by 0,2 unit:



Difference of date spectra and the mean of 35 spectra:



Only very faint variation are perhaps observed for the period.

Christian B

[Christian Buil]

Here a description of the method used for animate my CH Cyg sequences :

http://www.astrosurf.com/buil/isis/anim ... ion_en.htm

Christian B