AAVSO Alert Notice 454: Monitoring of CH Cyg requested

[Francois Teyssier]

Spectre du 20 mars (bleu) comparé à celui du 15 mars (rouge).
Significatif accroissement de l'intensité des raies de Balmer.
On notera également [OI] 6300
On voit là tout l'intérêt qu'il y a à suivre trés régulièrement cette étoile trés active.

_chcyg_2012-03-15_20.png (12.86 KiB) Viewed 12840 times

François Teyssier

[Robin Leadbeater]

Attached are my latest spectra at H alpha O[III]
The peak intensity at H alpha increased from 17 to 19 March but the wings decreased so the total EW stayed ~constant.

Robin

chcyg_ha_4-16-18mar12.png (10.12 KiB) Viewed 12835 times

chcyg_oiii_5-16-18mar12.png (9.56 KiB) Viewed 12835 times

[Eric Sarrazin]

Bonsoir,
Dans la série des comparaisons; Ci dessous la comparaisaon entre l'observation de François T. du 15/03 faite avec LISA et mon observation du 16/03 faite au LhiresIII-150t/mm-Atik314L+.

On va essayer de continuer à la suivre mais pour cette semaine la météo...
Eric

[Christian Buil]

More observations of CH Cyg from R. Leadbeater, D. Antao and T. Lemoult - compiled here:

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

Christian B

[Christian Buil]

And also add of the fine Eric Sarrazin spectrum for the date 16.060/03.

Une remarque pour toi Eric, mais aussi d'autre s: j'ai vu que tu a adopté pour le nom de l'objet "chcyg" lors
du traitement (entête FITS).

Je recommande un nom plus explicite, compatible avec une requette CDS - ce qui est un bon test.
Dans le cas présent tu aurais pu nommer l'objet "ch cyg", ou mieux encore, car plus lisible
et juste par rapport à la norme "CH Cyg". Faire bien attention à ces petits détails, respectez le
nom des objets - utiles pour un archivage futur. Songez à votre mémoire de cette observation
dans 10 ans.

Christian

[Robin Leadbeater]

Latest update from Margarita

----- Original Message -----
From: "Margarita Karovska" To: "Robin Leadbeater"
Sent: Tuesday, March 20, 2012 5:27 PM
Subject: Re: CH Cyg - Spectroscopy H alpha O[III] 2012-03-19


>
> We got the HST observations and 1/3 of Chandra.
> Next Chandra scheduled for now on 3/24.
>
>
> Thank you very much,
> Margarita
>

[Thierry Garrel]

Hello,
i had an opportunity to a all night session on CH cyg during the 19-20 March. 7H of observations. I had also a spectacular solar spectrum at the end...not includes in the CH cyg series of course.
Ha alpha as seen during the last 40H of observation shows small hourly (time resolution) variations of the blue peak. This is not due to tellurics and must be real. I localized a second sky emission line at 5661A. Both 5551A and 5561 are sensible to the height of the star above the horizon or bad guiding (letting sky background enter the fiber).
No variations seen in H beta and [OIII] during this 7h run.

[Thierry Garrel]

New comments from Margarita:
"Hi Thierry,

Again, very interesting, especially the changes of Halpha.
Halpha may be coming from some region of the accretion disk and perhaps varies as the high speed photometry shows at scales from few minutes to hours.
We've observed a quasi-period of ~500s in U an B. It would be good if one can get shorther exposure of the Halpha region (inspite of the lower S/N to see if there is a variation on 10 minutes sclale?

Thank you,
Margarita"

So it could help Margarita observations to make CONTINUOUS high resolution spectra in Ha with a 600s max exposure cadence despite lowering SNR.

[Thierry Garrel]

Breaking news !
"Hi Thierry,
Can anyone in the group go with a even higher cadence
(larger aperture telescope?)?

The Chandra observations are scheduled for Saturday-Sunday this week.

Cheers,
Margarita"

Bad weather in south of France hope someone will have the opportunity to fulfill this request.

[Thierry Garrel]

Quite a bit more challenging, not for whom own a meter class scope. So...

"Hi Thierry,
I agree.
The higher cadence (than 600) will be even better because the flickering period is 500s, so if there is a larger aperture perhaps a cadence of 50s to 100s may be achieved to probe for that.
We are having a high speed photometry done as part of the coordinated observations looking for flickering.
It would be most interesting to see what eg. Halpha does....
Cheers,
Margarita
?
or not?
Cheers,
Margarita