Low spectra of CH Cyg and BF Cyg required

[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 (20.08 KiB) Viewed 30283 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 (19.75 KiB) Viewed 30283 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

[Jacques Montier]

Hello,

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

CH Cyg

20150419_chcyg_dbl.png (84.34 KiB) Viewed 30240 times

BF Cyg

20150419_bfcyg_dbl.png (84.45 KiB) Viewed 30240 times

Cheers,

[Jacques Montier]

CH Cyg on 2015/04/28

20150427_chcyg.png (55.27 KiB) Viewed 30201 times

20150428_chcyg_dbl_ech.png (68.07 KiB) Viewed 30201 times

Regards,

[Joan Guarro Flo]

Hi to all:

Two news spectra of the CH Cyg.

Regards, J.G.

[Joan Guarro Flo]

This is the second.

J.G.

[Joan Guarro Flo]

Hi:

CH Cyg, comparison nights 20150512/0516.

Regards, J.Guarro.

[Francois Teyssier]

Impressive evolution

Spectrum obtained last night :

_chcyg_20150516_945_fteyssie_0.png (11.58 KiB) Viewed 30087 times

Also, the full spectrum in pdf :http://www.astronomie-amateur.fr/Result ... yssier.pdf

[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

[Joan Guarro Flo]

To All:

Two spectra of CH Cyg.

Regards, J. Guarro.

[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 ?