H-alpha: lambda = 656.3 nm

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Spectral Class Approximate Temperature (K) Hydrogen Balmer Lines Other Spectral Features
O 40,000 Weak Ionized helium
B 20,000 Medium Neutral helium
A 10,000 Strong Ionized calcium weak
F 7,500 Medium Ionized calcium weak
G 5,500 Weak Ionized calcium medium
K 4,500 Very weak Ionized calcium strong
M 3,000 Very weak Titanium oxide strong
L dwarf 2,000 1,500 TiO chromium hydride iron hydride
T dwarf Even cooler Methane
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H-alpha lambda 656.3 nm
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Element Abundance ( of total number of atoms) Abundance ( of total mass)
Hydrogen 91.0 70.9
Helium 8.9 27.4
Carbon 0.03 0.3
Nitrogen 0.008 0.1
Oxygen 0.07 0.8
Neon 0.01 0.2
Magnesium 0.003 0.06
Silicon 0.003 0.07
Sulfur 0.002 0.04
Iron 0.003 0.1