|
I used the join function in vspec to blend the 2 images.
The calibration for both image sets was 5 sec exposures x 5 stacked of the neon spectrum so I don't need to use any star lines for calibration. I used all the neon lines to calibrate but it is pretty linear anyway.
The only problem is that the silt seems to be tilted. The zero order slit is vertical but it becomes progressively more tilted as you get into the IR. It has a 6deg tilt in the IR range. The tilt in the spectrum however is the oposite way of only about 1 deg. I opted not to correct the tilt and just used the same crop of the calibration lines and the image lines.
I was also amazed that there were lines from the nebula. I thought that they might be ghost images left over from the neon lines but they don't line up at all with the neon lines. I will try again when the cloud goes away.
|