Dramatic change of H alpha profile

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

Dramatic change of H alpha profile

Postby Francois Teyssier » Thu Apr 23, 2015 6:13 pm

Red : Peter Somogyi Lhires III 2400 l/mm
Black : François Teyssier eShel

Only one day between the two spectra

CHCyg_20140421_2010422.png
CHCyg_20140421_2010422.png (15.99 KiB) Viewed 4743 times


The profile becomes again classical

François
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Re: Dramatic change of H alpha profile

Postby Christian Buil » Fri Apr 24, 2015 5:49 pm

A tentative of time sequence here:

http://www.spectro-aras.com/forum/viewtopic.php?f=6&t=1138

(je t'envoie les données François - je fini de dépouiller)

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Re: Dramatic change of H alpha profile

Postby Francois Teyssier » Sat Apr 25, 2015 8:21 am

Trés impressionnant Christian
J'attends tes spectres avec impatience.

L'évolution de H alpha (résolution 9000 à 16000) depuis le 1er mars : http://www.astrosurf.com/aras/Aras_DataBase/Symbiotics/CHCyg_Campaign/chcyg.html

Merci à Valérie pour la génération de page web par VSpec


François
Last edited by Francois Teyssier on Tue Apr 28, 2015 5:09 pm, edited 1 time in total.
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Re: Dramatic change of H alpha profile

Postby Francois Teyssier » Sat Apr 25, 2015 7:23 pm

Balmer lines

12-04-2014

CHCyg_20140412_096_HaHbHg.png
CHCyg_20140412_096_HaHbHg.png (17.08 KiB) Viewed 4673 times


24-04-2015

CHCyg_20140424_090_HaHbHg.png
CHCyg_20140424_090_HaHbHg.png (19.97 KiB) Viewed 4673 times


Comparison of the profiles of H beta, Fe II and [OI]

CHCyg_20140424_090_HbFeIIOI.png
CHCyg_20140424_090_HbFeIIOI.png (16.67 KiB) Viewed 4673 times
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Re: Dramatic change of H alpha profile

Postby Peter Somogyi » Sat May 02, 2015 12:03 pm

I have gathered last month's high resolution (R~10000) spectra from last month, and created a compilation around H-alpha.
Multiplied each with an individual constant, chosen carefully by creating 3-order continuum for each - rejecting the varying 6545-6580 region! - and finally used only their averages to pick the proper constant. (IRAF was able to fit that continuum specifying 2 separate ranges - simple normalization won't work properly here!)

Created an animated gif with using AAVSO:
result.gif
animated correlation
result.gif (441.93 KiB) Viewed 4640 times


Resolution and author per downloaded files from the ARAS database:

_chcyg_20150408_284_tlester.fit: R~8990, Tim Lester
_chcyg_20150412_096_full.fit: R~11000, Francois Teyssier
_chcyg_20150415_103_full.fit: R~11000, Francois Teyssier
_chcyg_20150418_983_full.fit: R~11000, Francois Teyssier
_chcyg_20150421_132_full.fit: R~11000, Francois Teyssier
_chcyg_20150422_011_psomogyi.fit: R~13374, Peter Somogyi (35um slit)
_chcyg_20150424_090_full.fit: R~11000, Francois Teyssier
_chcyg_20150425_113_psomogyi.fit: R~21446, Peter Somogyi (15um slit)
_chcyg_20150426_964_psomogyi.fit: R~21077, Peter Somogyi (15um slit)
_chcyg_20150427_971_fteyssier.fit: R~11000, Francois Teyssier

Special thanks to JM (Robert James) and AAVSO for having the R and B magnitudes!
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Re: Dramatic change of H alpha profile

Postby Peter Somogyi » Tue May 12, 2015 9:19 pm

Today morning catch, left peak decayed a lot within 3 hours:

_chcyg_20150511_966_12_105.png
_chcyg_20150511_966_12_105.png (22.82 KiB) Viewed 4550 times


R~15000, first is 30 min, new one is 5 min (during sunrise).
(Took BF Cyg in between - that has not really change.)

Thin cloud veils were present in the sky - appeared as ripples at H2O holes on the ref.star.
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Re: Dramatic change of H alpha profile

Postby Paolo Berardi » Sun May 31, 2015 12:00 am

Following the recent alert from Peter, who observed the symbiotic during a relevant H-alpha profile change on 30 may, I took the spectrum on two night in which the change occurred.

This is the profiles (R~16000) comparison for 29 and 30 may (a behaviour similar to 21-22 april event):

Image

I also detect a higher signal in the 30 may spectrum (~ 45K ADU of double peak maximum in single 600s exposure frames)

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Re: Dramatic change of H alpha profile

Postby Peter Somogyi » Sun May 31, 2015 10:19 am

Very nice Paolo, your coverage is important once that we caught this rare short event!

Here is a 11 x 5 minute serie (out of my 49 continuous shoot), have a few exoposures where V peak fallen below but don't show here.
Values are absolute (just used Deneb ref. star for all here - the one I could reach after sunrise...), took basic calibrations, with linear combinations of flat and cal.lamps.

chcyg_outburst_step0_absolute.png
chcyg_outburst_step0_absolute.png (2.3 MiB) Viewed 4442 times


I plan to do nicer graph for this (velocity, log, colour, ...).

Hope someone can catch the fall event too (coulds here), it's usually up for 1-2 days only!
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Re: Dramatic change of H alpha profile

Postby Francois Teyssier » Sun May 31, 2015 4:40 pm

What a great work Paolo and Peter on a fantastic (and complex star) !
The time series of Peter is a must.
As I said in private mails, I'll update the database only late June.
Of course, keep watching the star as often as possible (and also some look at BF Cygni to follow the red part of the line)
All the best,
François (in Quebec city until tomorrow)
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Re: Dramatic change of H alpha profile

Postby Christian Buil » Sun May 31, 2015 11:40 pm

Here a 1h30m observation of CH Cyg with a swap of V/R peak. Taken the 31/05/2015 (date are in the legends):

Image

(200 mm f/5 Newton, VHIRES-MO (R=50000), exposure: 600 sec (each, i.e. time resolution), H2O telluric lines removed)

Changes are continuous. Organisation of a world amateur survey during a period of 2 or 3 days seem possible and welcome, also a first on these subject and a fine demo for professional community of amateur capacities! (possible good weather condition in France from 3 to 6 June).

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