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Low spectra of CH Cyg and BF Cyg required

Posted: Wed Apr 15, 2015 5:55 pm
by Francois Teyssier
In these two stars appears fast and dramatic evolutions of line profiles

See for example
CHCyg_2015-04-12_2015-04-15.png
CHCyg_2015-04-12_2015-04-15.png (20.08 KiB) Viewed 21824 times
Comment from Augustin Skopal :
I have looked the new spectra of CH Cyg and BF Cyg. Really dramatic
changes in the profiles of Balmer lines on the time-scale of a few days!


Also on BF Cyg
bfcyg_20150323_20150412.png
bfcyg_20150323_20150412.png (19.75 KiB) Viewed 21824 times
Comment from Augustin Skopal :
As concerns to BF Cyg, I was also surprised with changes in the hydrogen
line profiles. At first look the shift to the red seems as a result
of a wrong calibration of the last spectrum from 12/04/2015, but
comparing the 01/04/2015 spectrum to that from 23/03/2015 suggests
that calibration and/or heliocentric correction is O.K. Just significantly
more absorption on the blue side, and more emission on the red side of
the line appeared.


A. Skopal's request :
However, to interpret such variations will not an easy task. Above all,
we need the continuum profile, which is possible to obtain by modelling
the low-resolution spectra. So, I hope that somebody will obtain also
a low-res spectrum (CH Cyg and BF Cyg).


Waiting for spectra,

François Teyssier

Re: Low spectra of CH Cyg and BF Cyg required

Posted: Mon Apr 20, 2015 1:46 pm
by Jacques Montier
Hello,

Two low resolution (R 600) spectra of CH Cyg and BF Cyg on 20150420

CH Cyg
20150419_chcyg_dbl.png
20150419_chcyg_dbl.png (84.34 KiB) Viewed 21781 times
BF Cyg
20150419_bfcyg_dbl.png
20150419_bfcyg_dbl.png (84.45 KiB) Viewed 21781 times
Cheers,

Re: Low spectra of CH Cyg and BF Cyg required

Posted: Tue Apr 28, 2015 1:05 pm
by Jacques Montier
CH Cyg on 2015/04/28
20150427_chcyg.png
20150427_chcyg.png (55.27 KiB) Viewed 21742 times
20150428_chcyg_dbl_ech.png
20150428_chcyg_dbl_ech.png (68.07 KiB) Viewed 21742 times

Regards,

Re: Low spectra of CH Cyg and BF Cyg required

Posted: Wed May 13, 2015 11:07 am
by Joan Guarro Flo
Hi to all:

Two news spectra of the CH Cyg.

Regards, J.G.

Re: Low spectra of CH Cyg and BF Cyg required

Posted: Wed May 13, 2015 11:11 am
by Joan Guarro Flo
This is the second.

J.G.

Re: Low spectra of CH Cyg and BF Cyg required

Posted: Sat May 16, 2015 3:09 pm
by Joan Guarro Flo
Hi:

CH Cyg, comparison nights 20150512/0516.

Regards, J.Guarro.

Re: Low spectra of CH Cyg and BF Cyg required

Posted: Sun May 17, 2015 6:13 pm
by Francois Teyssier
Impressive evolution

Spectrum obtained last night :
_chcyg_20150516_945_fteyssie_0.png
_chcyg_20150516_945_fteyssie_0.png (11.58 KiB) Viewed 21628 times
Also, the full spectrum in pdf :http://www.astronomie-amateur.fr/Result ... yssier.pdf

Re: Low spectra of CH Cyg and BF Cyg required

Posted: Tue Aug 25, 2015 9:09 pm
by Vincent Bouttard
Hello,

A low resolution spectrum of CH Cygni on 2015/08/12 (JD 2457247) at the beginning of the OHP worshop 2015.
Setup : Orion 200 F/5 Newtonian + Alpy 600 + Atik 460EX + Takahashi EM-200.

Regards
Vincent

Re: Low spectra of CH Cyg and BF Cyg required

Posted: Tue Nov 24, 2015 8:33 pm
by Joan Guarro Flo
To All:

Two spectra of CH Cyg.

Regards, J. Guarro.

Re: Low spectra of CH Cyg and BF Cyg required

Posted: Tue May 09, 2017 11:29 am
by etienne bertrand
Spectre de CH Cyg acquis en fin de nuit il y a 2 jours, à ma grande surprise le continuum est assez plat jusqu'à 3200A, est ce exploitable ou c'est du bruit ?
Le spectre aussi se relève dans le bleu, est ce normal ?
Image