Dramatic change of H alpha profile

[Olivier GARDE]

And to try to better see the oscilations of the blue part of H alpha emission line.

[Jacques Montier]

Hello all,

CH Cyg spectrum of the last night 2015/06/26

20150626_chcyg.png (48.94 KiB) Viewed 15436 times

Animation of 15 profiles of 180s each.

20150626_chcyg_animation.gif (364.51 KiB) Viewed 15412 times

The small Halpha line oscillation seems to go on.


Regards,

[Peter Somogyi]

Next evening (5 minute exposures, 25cm Newt, LHires/2400/15um, R~20K-18K, break between .897 and 911):

_chcyg_20150626_873_940.gif (396.88 KiB) Viewed 15387 times

It was very slowly fading (note the 5:1 peak ratio to continumm already lower than the 8:1 outbreak we saw - but still seem to be double peaked).
After more than 1.5 hour observation switched to another target.

[Jacques Montier]

Hi all,

On 2015/06/27, blue wing of Halpha line has decreased a lot.
Peter, you observed the beginning, so we missed the transition...

20150627_chcyg.png (46.04 KiB) Viewed 15370 times

Here is the animation with 20x180s spectra.

20150627_chcyg_animation.gif (470.26 KiB) Viewed 15370 times

The profile looks quiet.

Cheers,

[Peter Somogyi]

Yesterday it had double peak again (6:1 - 5:1 ratio of Ha/cont., Lhires 2400/mm, 15um slit, R~25K, 13 x 5 min):

_chcyg_20150628_869_918.gif (351.24 KiB) Viewed 15323 times

Taken through randomly going over clouds (= variable SNR), finally had to give up.

Peter

[Jacques Montier]

Hi all,

CH Cyg spectrum of the last night on 2015/06/29

20150629_chcyg.png (44.26 KiB) Viewed 15294 times

Animation with 24x180s spectra

20150629_chcyg_animation.gif (532.03 KiB) Viewed 15294 times

Double peak again with a very impressive blue wing Halpha line.

PS : a strange and slight wavelength shift along the 24x180s spectra ; neon calibration lines moving during monitoring with LhiresIII ?

Cheers,

[Francois Teyssier]

c'est impressionnant, Jacques
Le continuum est remarquablement stable.
Bonne continuation
François

[Jacques Montier]

Oui et c'est d'autant plus impressionnant de suivre l'évolution du profil en temps réel pendant les acquisitions.

ecran_controle.jpg (40.26 KiB) Viewed 15252 times

À bientôt

Amitiés,

[Olivier GARDE]

Another animation of CH Cyg : time serie of 64 exposures of 180s each (3H)

For Halpha



For H Beta (see the small emission line near 4888 Â)

[Peter Somogyi]

Yesterday I was experimenting around H-beta with LHires + 600/mm + 15um slit, got around R~3000 in blue (which I'm satisfied because blue is less good at res. - at blue end, I can't even focus properly all the range).

3 minute exposures, with a few cal. pauses:

result_psomogyi_20150704_05_Hb_all.gif (1.98 MiB) Viewed 15156 times

Interpolated 3 times a ref.star Iot Cyg.
Took a bit few Ne/Ar manually (hopefully automated today...) but in return, exposures quite continuous with 3 bigger breaks.
Processed by ISIS, other than ref. star interpolation have not touched the continuum.

Note: this is also my lesson to get more precise calibration, after returning to lower it's more obvious...

- Peter