Dramatic change of H alpha profile

[Olivier GARDE]

A time serie graph of CH Cyg during 3H30

[Jacques Montier]

Hi all,

10x180s exposures of CH Cyg on 2015/08/22.
CH Cyg Halpha profile is quite stable.

@anim_chcyg.gif (48.33 KiB) Viewed 17311 times

Best regards,

[Olivier GARDE]

Another time series taken last night during 6 hours.
Some smalls variations in the blue and red part of H Alpha

[Peter Somogyi]

It might be very thin veils (though SNR was exceptionally good this time), but I'm not aware of any H2O line at the right peak gash (LHires 2400/23um slit) that seems to be a new feature comparing to my past observations:

@chcyg20150830_goodflat.gif (132.52 KiB) Viewed 17242 times

The left peak returned to equal when star reached a tree, obstructing further observation.

EDIT: accidentally used a raw flat instead of reduced one, uploaded a corrected animation (no real change, my statements valid).

[Jacques Montier]

Hi all,

CH Cyg of the last night 2015/09/01

20150901-chcyg.png (48.47 KiB) Viewed 17220 times

Time series of 18 x 180s

20150901-chcyg.gif (459.1 KiB) Viewed 17220 times

Regards,

[Olivier GARDE]

A time serie taken the 5th september during 4 hours. Some variation in the blue part of H Alpha

[Peter Somogyi]

CH Cyg was not at rest yesterday (2015.09.20, 31 x 5 min):

CHCyg_20150920_21.gif (253.66 KiB) Viewed 17153 times

I had to discard the 24. exposure due to cosmic ray has hit directly the H-alpha region, that has been interpolated by (23+25)/2 here.
Sky was poor at this time, so as the SNR.

2D (33% shrink by X, 300% enlarged by Y):

CHCyg_20150920_2d.png (165.57 KiB) Viewed 17153 times

2D by column median removed:

CHCyg_20150920_2d_colmed.png (165.57 KiB) Viewed 17153 times

Interesting to see the faint afterglow continued on the other(R) side.

Cheers,
Peter

[Olivier GARDE]

Another time serie of CH Cyg taken last night during 2H30

[Olivier GARDE]

Time serie spectrum of CH Cyg during 3H45' with eshel spectrograph R=110000

The full spectrum


Time serie spectrum on order 34 (H Alpha)


And an animation of HeI 5876 Å line

Is the small "pick" evolution inside HeI line are real or not ?

[etienne bertrand]

Bravo pour cet excellent travail