BF Cyg

[Peter Somogyi]

Fresh spectra from today, just before sunrise:

R~3500 (LhiresIII + 600/mm + 23um slit).
I didn't feel it as bright as 9.5 mag on AAVSO, was still hard to guide on (might had a defocus of the scope), some noise present but the spikes to the left are real.
But, continuum + Ha matches well with my last Alpy 600 spectra at LoRes.
H-alpha decreased a lot since summer, and has an interesting shape (strange slope to the right, hole to the left).

[Peter Somogyi]

Update from last night:

I have noticed some instability of my calibration, guessing the polynom can deviate near edge of the image (here ~6250A) whilst RMS < 0.02, it would be nice in ISIS could draw a graph for checking the wavelength function, similarily to IRAF where we have tons of options to tune the polynom.
Also tuned collimation and pushed the Ne-bulb now over the slit, but I still don't get stable Ne-calibration (whilst the 20-minute exposures don't move).
I plan to make use of the original Ne circuit + bulb, already separated into a small lightweight plastic box and is working, just cables are too short / need to drill a hole in the newt.

[Peter Somogyi]

Update with the 2400/mm + LHires (R~17000):

Peter

[Francois Teyssier]

The calibration looks very good

Red : eshel spectrum obtained a few minutes before

BFCyg_20140419_comp.png (21.78 KiB) Viewed 4561 times

One can see the better resolution of Lhires III 2400 l/mm in comparison to eshel

Congratulations,

François

[Peter Somogyi]

BF Cyg before yesterday (35um slit - this time managed to get only R~10000, 1.9 hours), arranged to bottom in a monthly view:

bfcyg_03_06_bigview.png (2.21 MiB) Viewed 4466 times

Took several other spectra too, but need to redo the dark (switching to -12C).