CHAPTER 1. DISCOVER YOUR ALPY 600
The thread around the slit is of SM1 type: external
diameter 1,035" (26,29mm), 40 threads/inch (pitch
= 0.635mm).
The standard 1,25” nosepiece includes a standard
filter thread (M28.5 x 0.6mm): you can easily mea-
sure the response curve of any filter mounted in a
standard ring.
1.5 Visual observation
Now, take the core element and look at any light
source: classical lamp, or spectral lamp, or even the
sky, cloudy or not (do not look directly at the sun, it
is far too bright).
Do not look directly at the Sun, with or even
without a telescope !
You’ll see your first spectrum. Look at different sources,
to see the different spectra types :
A tungsten lamp has a continuous spectrum:
A power saving lamp has several bright emission
lines and some bands:
The Sun shows a continuous spectrum, with a huge
number of Fraunhofer absorption lines:
This shows that each source of light has it own
spectrum, and the spectrum reveals a lot of scentific
information about its origin.
This will be the same for stars and any astronomical
object : each one has its own spectrum, which reveals
many physical parameters of the star.
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