CHAPTER 3. ALPY 600 - STELLAR SPECTROSCOPY IN SLITLESS MODE
Attach the Alpy 600 core element to the nosepiece
(remove it from the external body):
This nosepiece can be put in a standard 1,25” eye-
piece holder:
Select a bright star in the sky (preferably B or A
type), and point the telescope at it. Now look through
the Alpy 600 core element, and focus the telescope to
give a very thin spectrum. Turn the Alpy 600 in such a
way that the spectrum is horizontal, with blue on the
left and red on the right.
You should see something like this:
You can now look at different stars and bright ob-
jects.
3.3 Recording a star spectrum
After observing visually, you will certainly want to
record images. You’ve learned how to proceed with
spectrum acquisition and reduction, you’ve put the
spectroscope on your telescope: now, it’s time to do
both together !
3.3.1 Tuning the instrument
In section 2, you’ve seen how to tune your Alpy
600 (to produce a focused and horizontal spectrum
with the CCD camera). You must start from there and
switch to the slitless mode (change the slit to the
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