mgiimeans mg or singly ionized, 1e missing
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2/19/19
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MgII means Mg+ or singly ionized, 1e- missing
2/19/19
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Annie Jump Cannon
Antonia Maury
Cecilia Payne-Gaposchkin
Spectral Type
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Hotter Colder
Zöllner�s (Incorrect) Hypothesis
EvolutionEarly-typeLate-type
But the terminology stuck…
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Subdivisions of Spectral Type:
Letter & Number
B0 hotter than B9
B0-B5 “early B”
B5–B9 “late B”
Luminosity Class / Morgan-Keenan-Kellmann (MKK) Class
Class Description
Ia-0 Hypergiant
Ia Bright supergiant
Iab Normal supergiant
Ib Subluminous supergiant
II Bright giants
III Normal giants
IV Subgiant
V Main-sequence (dwarf) star
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Brown Dwarfs (only burn 2H NOT pp chain)
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