Dramatic change of H alpha profile

[Peter Somogyi]

Before yesterday I did another experiment with the 600/mm by taking automatically Ne/Ar per exposure, finally I just did "Wavelength Registration" so used only the 1st of them - still saw the skew of lines at higher magnification (1-2A) that Wav.Reg. feature removes - but question then which of my per-exposure calibrations was correct.

So here is the basic result (this time 5 min x 29 frames), all processed by ISIS, using only 1st cal.frame:

psomogyi_20150705_5min_n29_wavreg.gif (844.1 KiB) Viewed 4605 times

(LHires 600/mm, 15 um slit, ATIK 414 EXm, R~3000 - 2500 in the end, Helioc. corrected)

At least caught a bigger outflow at H-beta, with tons of other lines varying.
The blue peak of Hb was down comparing to previous day.

Cheers,
Peter

[Francois Teyssier]

H alpha line tonight
Double pic
Almost stable during the acquisition

_chcyg_20150715_901_full.png (8.94 KiB) Viewed 4562 times

[Jacques Montier]

Hi all,

François, we have been recording the same target that night

20150715_chcyg.png (49.05 KiB) Viewed 4550 times

Cheers,

[Peter Somogyi]

Last night's session beginning and end:

_chcyg_20150717_18.png (21.05 KiB) Viewed 4521 times

Both end have multiple exposures, but it was not changing enough to compile meaningful animation, and taken other targets in between.

Cheers,
Peter

[Benjamin Mauclaire]

Hello,

Here is a 2 hours animation of 10 minutes spectra with Lhires3 2400 g/mm and 12" SCT.
Spectra and animation were done sith Spcaudace:

CH_Cyg_anim.gif (145.04 KiB) Viewed 4491 times

We can see V/R inversion of Ha line while at the same time He I 6678 A line is maximum when V(blue) pic of Ha is at maximum.
Is there any interpretation of such phenomenon?

Cheers,

Benji

[Miguel Rodriguez]

Spectrum from last night. Double peak. L-200 spectrograph with 600l/mm grating. R=4351 computed by ISIS.

[Olivier Thizy]

I took three series of spectra on CH Cygni. Need to finetune my setup to reduce the exposure time as lot happens during the 10 mins exposures!

On july 25th, here is animation over almost 3h observation:

CH Cygni 20150725.gif (88.28 KiB) Viewed 4437 times

Cordialement,
Olivier Thizy
http://observatoire-belle-etoile.blogspot.fr/

[Olivier Thizy]

Hello,


Here is a quick comparison between spectrum taken on july 25th and one last night, huge change in two days but actually it changes very quickly sometimes! A star to monitor in high resolution:

_CHCyg__chcyg_20150725-27.png (6.32 KiB) Viewed 4427 times

See ARAS march 2015 newsletter for some explanations from Augustin Skopal around this system - still lot to uncover and amateur spectra can help specially if we do a continuous monitoring:
http://www.astrosurf.com/aras/novae/InformationLetter/InformationLetter.html

Specially this newsletter: http://www.astrosurf.com/aras/novae/InformationLetter/ARAS_EruptiveStars_2015-04.pdf


And couple of pictures taken during the last night acquisition:

Cordialement,
Olivier Thizy
http://observatoire-belle-etoile.blogspot.fr/

[Olivier GARDE]

Here's a time serie during 4H30 (one exposure each 5 minutes), a compilation of 52 spectra taken with eshel spectrograph (R=11000).
The graph show the variation of the blue part of H alpha line;

[Benjamin Mauclaire]

Hello everyone,

During July 27th, I've made a 7 hours run of spectra (10 minutes each). It started at 10h30 pm local time and stoped at 5h30 am local.

CH-Cyg_anim_20150727.gif (504.47 KiB) Viewed 4423 times

This automatic observation was done by running a script under Audela.
It takes calibration lamp spectrum every hour, then finish by parking the telescop, switch off all devices, backup and send the archive to the home computer and close observatory's roof.

This time, CH Cyg's spectrum started with an triple pic on Ha line. Then it disapeared.
We still see that maximum emission for blue Ha line and He 6678 line are synchronized.

Clear sky,

Benji