AAVSO Alert Notice 454: Monitoring of CH Cyg requested

[Robin Leadbeater]

A comparison of CH Cyg H alpha on 22nd and 25th March. Conditions were very poor last night so I kept the single exposures at 600s

Robin

chcyg_Ha_20120322-25.png (7.25 KiB) Viewed 10477 times

[Robin Leadbeater]

Update from Margarita and a request for continued observations for next 2 weeks (1-2 per week)

Cheers
Robin

----- Original Message -----
From: "Margarita Karovska" To: "Robin Leadbeater"
Sent: Monday, March 26, 2012 11:38 PM
Subject: Re: Chandra obs schedule


> The Chandra observations went very well,
> Just took a preliminary look...
>
> It is very important to have a good spectrum of the other lines and the
> continuum - not just Halpha.
> I don't know if anyone got that but that is what we need to go with
> Chandra and HST.
> I mean Halpha, but also Hbeta, [OIII} which you have been following, and
> also spectra showing the nearby continuum.

> Is it possible to continue spectroscopy for a couple of weeks?
>I am watching CH Cyg photometry... following in the next two or so weeks. Once or twice a week
> will be great (Halpha [Oiii] and other lines if other observers can do it.)

>It will be also intresting to see the variations that were detected with the 150 or so cadence.
>I am very grateful for the spectroscopy - it looks very interesting.


> Thank you very much,
> Margarita

[Olivier Thizy]

Hello,


here is an observation of CH Cygni taken last night (march 26, 2012; OHP observatory).
Not sure of the scientific interest as R~900... but it was fun to take!

CH Cygni

spc_CH_Cyg.png (6.21 KiB) Viewed 10466 times

Televue 85mm F/7 + LISA spectrograph (Atik 314L+ camera); 1h exposure with very good seeing.


Cordialement,
Olivier

[Franck Houpert]

Petite animation du changement d'intensité d'Ha. 20mn entre chaque pose.




Franck

[Francois Teyssier]

Bonjour Franck,
Tu aurais donc une variation d'intensité de 10% en quelques heures.
Cela ne correspond pas aux résultats présentés parf Stéphane (page précédente).
Pourrais-tu nous présenter les spectres correspondant au minimum et au maximum que l'on voit sur ton animation ?
Cordialement
François Teyssier

[Thierry Garrel]

non c'est cohérent avec les observations engrangées. Effectivement H alpha varie au cour d'une même nuit en 5-6H. Il est associé une modification de profil, double pic_ simple pic. Par contre nos observation d'une variation ultra rapide, avec une période de - de 500s n'ont pas été fructueuses. Mes times series de 180s sur 5H ne montre rien au dessus du bruit, pareil pour Stephane.
Margarita confirme la variation lente et a besoins d'étudier les spectres en time series pour la seconde. J'ai 2Go à traiter encore.
A noter que les observations sont maintenues pour 2 semaines encore. Ce coup ci s'est priroité au SNR donc pose longue unitaire et fin des time series.
Moi je suis claqué par ces runs d'observations, je n'ai pas encore récupérer du WE. On se fait vieux...

[Franck Houpert]

Bonjour,

Spectre intensité mini et max ci dessoous.

Chaque spectre est composé de 2x600s. Je vais faire un spectre par acquisition et j'envoie à Christian.




Les memes avec zoom sur Ha et le continuum





Franck

[Robin Leadbeater]

Margarita reports that she may be missing some emails sent to her at cfa (the spam filter is very strict). She asks if you email her to please copy it to both her email addresses.

karovska "at"cfa "dot" harvard "dot"edu
karovska "dot" margarita "at" gmail "dot" com

Thanks
Robin

[Francois Teyssier]

Bonjour,

Spectre intensité mini et max ci dessoous.

Chaque spectre est composé de 2x600s. Je vais faire un spectre par acquisition et j'envoie à Christian.


Franck

Franck,
C'est effectivement impeccable, le continuum est trés reproductible.
J'avais mal lu les heures des spectres de Stéphane et pensais que sa série était plus étendue dans le temps.
Intéressant de voir que seule la partie rouge varie sur ta série alors que l'absortion centrale et le bleu sont stables.
Bonne continuation
François Teyssier

[Robin Leadbeater]

Below is the latest email from Margarita.
The table of spectra needs updating (I have sent several spectra but they have not yet appeared)
Is anyone still observing? I have been away but hope to get at least one more set of spectra when I return later this week if the weather cooperates.

Cheers
Robin

----- Original Message -----
From: "Margarita Karovska"
To: "Robin Leadbeater"
Sent: Monday, April 02, 2012 8:00 PM
Subject: Thank you ; Campaign status?


> Hi Robin,
>
> First I'd like to thank you and all the participants in the CH Cyg
> Campaign CH Cyg for great observations --beautiful spectra.
> Is it possible to convey this on the Campaign web page?
>
> The Chandra and the HST observations look great.
> A number of structures are visible in both spectral regions, but will
> take some time to analyze and understand (as it will be for the spectra).
>
>
> I haven't seen observations last week?
> Is anyone taking spectra?
> It would be great to monitor it for a bit as it seems to be getting off
> of the outburst max. Also, the high-speed spectra of Halpha (few more)
> would be most interesting, if possible.
>
> I will download the spectra that are on the current table.
>
> All the best,
> Margarita
>