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Spectral Classification (G (Yellow, Solar-type spectra, \( \ce{Ca\, II} \)…
Spectral Classification
Spectral lines
-
\( \ce{He} \)
-
\( \ce{He\, II} : 4686 \)
Metals
\( \ce{Ca\, II\, H \& K} : 3968 \text{ et } 3933 \)
-
\( \ce{Na\,D} \text{(doublet)} : 5889-5895 \)
O
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Strong \( \ce{He\, II} \) absorption (sometimes emission) lines
\( \ce{He\, I} \) absorption lines becoming stronger
B
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\( \ce{He\, I} \) absorption lines strongest à B2
\( \ce{H\, I} \) (Blamer) absorption lines becoming stronger
A
-
Balmer absorption lines strongest à A0, becoming weaker later
\( \ce{Ca\, II} \) lines becoming stronger
F
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\( \ce{Ca\, II} \) lines continue to strengthen as Balmer lines continue to weaken
Neutral metal absorption lines (\( \ce{Fe\,I,\,Cr\,I} \))
G
-
-
\( \ce{Ca\, II} \) lines continue becoming stronger
\( \ce{Fe\,I} \), other neutral metal lines becoming stronger
K
-
\( \ce{Ca\, II\, H\&K} \) lines strongest à K0, becoming weaker later
-
M
-
Spectra dominated by molecular absorption bands, especially titanium oxide (\( \ce{TiO} \)) and vanadium oxide \( \ce{VO} \)
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