mgiimeans mg or singly ionized, 1e missing

2/19/19 1 MgII means Mg + or singly ionized, 1e - missing

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2/19/19

MgII means Mg+ or singly ionized, 1e- missing

2/19/19

Annie Jump Cannon

Antonia Maury

Cecilia Payne-Gaposchkin

Spectral Type

Page 3: MgIImeans Mg or singly ionized, 1e missing

2/19/19

Hotter Colder

Zöllner�s (Incorrect) Hypothesis

EvolutionEarly-typeLate-type

But the terminology stuck…

Page 4: MgIImeans Mg or singly ionized, 1e missing

2/19/19

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

Page 5: MgIImeans Mg or singly ionized, 1e missing

2/19/19

Brown Dwarfs (only burn 2H NOT pp chain)

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