Page 25 - analysis-and-interpretation-of-astronomical-sp

Analysis and Interpretation of Astronomical Spectra 25

Sun Spectrum λ 5256 – 5287 Å

Comparison Prototype Echelle- with Cerny Turner Spectrograph

Cerny Turner R ≈ 80‘000

Echelle R ≈ 20‘000

Sun Spectrum λ 5160 – 5270 Å

Comparison Prototyp Echelle- with DADOS Spectrograph 900- and 200 L mm-1

Echelle R ≈ 20‘000
DADOS 900L mm-1 R ≈ 4‘000
DADOS 200L mm-1 R ≈ 800

Magnesium Triplet: λ 5167, 5173, 5183 Å

Richard Walker 2011/03

The comparison of these graphs shows the following:

 If the resolution (R) is increased it becomes clearly evident that in stellar spectra practi-
cally no "pure" lines exist. Apparent single lines almost turn out as a "blend" of several
sub lines, if considered at higher resolutions.