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Doppler effect allows to measure radial velocity, rotational speed,
and expansion speed. It is the key to study binary systems and it has
been the key of the discovery of the first exoplanet in 1995.
Line profiles are also modified by wave movement at the surface of
stars. Asterosismology allow to better understand the internal structure
of stars. Even if one can't see the star surface visually, their light brings
us a message full of learning!
1.13.8 Conclusion
Spectrography is like archeology or a criminal case study. With
clues included in spectra, the astrophysist tries to go back to the root of
the phenomena. Almost all professional observations are done today in
spectrography. Large telescope are equiped with powerful spectrographs
to analyse large spectral domain and several targets at once.
With your Lhires Lite, you can explain to the public the link between
star light (using the closest star we know: our Sun) and spectral analysis.
λ−
λ
λ+
Lhires Lite – User Manual DC0005C
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