The attached image shows Alp Crux (B0.5iv) spectrum obtained with a 207l/mm grating mounted on an ED80 using ATiK 314 camera.
The dispersion is 16.6A/pixel
A work in progress, but shows the more prominent lines.
(A B0v comparison from Miles database and the B0 planck curve for info.)
Processed using BASS Project 1.9.7
Beren,
You should be able to obtain similar, or better! results using your grating.
The dispersion of 16A/pixel is low, a target of 10A/pixel may be slightly better.
Give it a go.......
Have a bit of data to go through including Alpha crux from last week, be good to see what results I get. I used a mono ccd this time and I think from a brief process of Sirius the dispersion was 14A/pixel, I was using a 10" reflector ( not sure if this good with the spider vanes). Downloaded the bass project software too.
Have been experimenting with different exposures for capturing spectra. I was worried that getting into non-linear region in pixel response I will be distorting spectra, but it seems that I perhaps should go for longer exposures still?
Attached is an un-calibrated spectra with two different exposures. I am still not being able to identify specific absorption lines...loving the challenge! :-)
Suavi,
Yes, you could give it a lot more exposure without fear.
Yes, your calibration looks good.
I notice you haven't selected a binning zone (and background sky removal zones) - you should do this....Selection tab/Quick active and sub regions, use the mouse to select a strip across the spectral image.
I've made up a label set ....
Just unzip to the BASS Project folder and use the label icon (three from the top right) to load it.
Suavi,
After calibration BASS will give you the dispersion - below the chart, right hand side...
You can then compare this dispersion with your spacing (and binning if used) to confirm.
I use TransSpec.
very nice Ken .
