brightness dropping - new call for spectra

Campaign on the request of Dr Ausgustin Skopal
H alpha line at R > 10,000
and low res spectra

brightness dropping - new call for spectra

Postby Robin Leadbeater » 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
LHIRES III #29 ATIK314 ALPY 600/200 ATIK428 Star Analyser 100/200 C11 EQ6
http://www.threehillsobservatory.co.uk
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Re: brightness dropping - new call for spectra

Postby Francois Teyssier » Mon Jun 13, 2016 2:39 am

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Re: brightness dropping - new call for spectra

Postby Robin Leadbeater » Mon Jun 13, 2016 5:17 pm

Hello François,

The link "H alpha profiles and time series" at the bottom of the database page is pointing to a local file

Cheers
Robin
LHIRES III #29 ATIK314 ALPY 600/200 ATIK428 Star Analyser 100/200 C11 EQ6
http://www.threehillsobservatory.co.uk
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Re: brightness dropping - new call for spectra

Postby Francois Teyssier » Tue Jun 14, 2016 7:26 am

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Re: brightness dropping - new call for spectra

Postby Francois Teyssier » Wed Jun 15, 2016 5:10 am

Message from Dr Augustin Skopal

Thank you very much for informing me about recent behaviour of CH Cyg. I am also glad that others are interested in your (ARAS) spectra, and that they are publicly available. This shows importance of your observations made with a high cadence and continuously, which is of particular importance for the research of objects showing not-repeatable events on time-scales from minutes to decades of years, such as, for example, symbiotic stars.

As concerns to observations of the current CH Cyg event, all types of observations are important. Low-resolution spectroscopy within the largest wavelength range as possible (for modelling SED) and the medium-resolution spectra (R~11000) covering a standard range of 420--720 nm. As CH Cyg is now somewhat fainter and without any strong emissions, a larger exposure can be applied.

Good luck and best regards (to all),



So let''s go on, including low resolution spectra as far as possible in the near UV, with the better instrumental/atmospheric response as possible.

Cet intérêt grandissant de plusieurs professionnels pour les résultats que nous obtenons est la meilleure réponse que nous pouvons apporter aux propos mensongers et malveillants formulés sur spectro-l à l'égard des bases ARAS et BESS.

François Teyssier
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Re: brightness dropping - new call for spectra

Postby Olivier GARDE » Wed Jun 15, 2016 5:57 am

Ok François,

Je refait CH Cyg en time série avec l'eshel dés que possible (pas terrible la météo en ce moment...)
LHIRES III #5, LISA, e-Shel, C14, RC400 Astrosib, AP1600
http://o.garde.free.fr/astro/Spectro1/Bienvenue.html
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Re: brightness dropping - new call for spectra

Postby Francois Teyssier » Sat Aug 13, 2016 9:25 am

Update

Changes in [OIII] lines in July
asdb_chcyg_20160811_950_[O III 5007].png
asdb_chcyg_20160811_950_[O III 5007].png (35.19 KiB) Viewed 5647 times


The last spectrum was obtained during OHP meeting with a Newton 20 cm. I works.

More lines : http://www.astronomie-amateur.fr/Documents%20Spectro/CHCyg-2016.pdf

Margarita thanks all obersvers
A weekly coverage, low and high resolution is requested

François
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Re: brightness dropping - new call for spectra

Postby Olivier GARDE » Sat Aug 13, 2016 10:01 am

Nice results François !!!
LHIRES III #5, LISA, e-Shel, C14, RC400 Astrosib, AP1600
http://o.garde.free.fr/astro/Spectro1/Bienvenue.html
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