brightness dropping - new call for spectra
Posted: Sun Jun 12, 2016 11:51 am
From: Margarita Karovska
Sent: Saturday, June 11, 2016 7:01 PM
To: Margarita Karovska
Cc: François Teyssier ; Thierry Garrel ; Robin Leadbeater ; Stéphane Charbonnel ; karovska@cfa.harvard.edu
Subject: Re: CH Cygni spectroscopic campaign
Dear Friends of CH Cyg,
Our friend seems to be dropping abruptly in B and V in the recent weeks which may indicate a significant change in the activity in the system (including a new jet).
Do you have recent spectra of this system?
It would be very helpful if you could monitor it spectroscopically (at least once a week if it is possible). We are trying to understand what is causing this activity (as well as several similar events observed in the past decade or so).
As before, H alpha, [O III] 5007A, (or any part of the spectrum ) will be great!
It is about V~7.5 and B~9.2 or so at this point.
AAVSO has sent a notice last week asking for photometric monitoring in B and V (and other photometry)
https://www.aavso.org/aavso-special-notice-417
Coordinates: RA 19 24 33.07 Dec. +50 14 29.1 (J2000.0)
With gratitude, wishing you clear skies,
Margarita
Sent: Saturday, June 11, 2016 7:01 PM
To: Margarita Karovska
Cc: François Teyssier ; Thierry Garrel ; Robin Leadbeater ; Stéphane Charbonnel ; karovska@cfa.harvard.edu
Subject: Re: CH Cygni spectroscopic campaign
Dear Friends of CH Cyg,
Our friend seems to be dropping abruptly in B and V in the recent weeks which may indicate a significant change in the activity in the system (including a new jet).
Do you have recent spectra of this system?
It would be very helpful if you could monitor it spectroscopically (at least once a week if it is possible). We are trying to understand what is causing this activity (as well as several similar events observed in the past decade or so).
As before, H alpha, [O III] 5007A, (or any part of the spectrum ) will be great!
It is about V~7.5 and B~9.2 or so at this point.
AAVSO has sent a notice last week asking for photometric monitoring in B and V (and other photometry)
https://www.aavso.org/aavso-special-notice-417
Coordinates: RA 19 24 33.07 Dec. +50 14 29.1 (J2000.0)
With gratitude, wishing you clear skies,
Margarita