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A presentation enumerating the different types of stellar classification systems used in the field of astronomy.
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Stellar Classification
SystemsFernandez, Jhan-Curt
• Secchi Classifi cati on System
• Harvard Classifi cati on System
• Yerkes Classifi cati on System
Secchi Classification System
Class I- White and Blue Stars
Class II- Yellow Stars
Class III- Orange to Red Stars
Class IV- Red Stars
Class V- Emission Line Stars (Wolf-Rayet, Be stars, etc.)
Harvard Classification System
O-Type: blue
B-Type: blue white
A-Type: white - blue white
Y-Type: brown
L-Type: red
K-Type: yellow orange
M-Type: orange red
F-Type: white T-Type: purple red
G-Type: yellowish white
Temperature
museumoflight.org
jamietakahashi.deviantart.com
Yerkes (MKK) Classification System
Class 0
Class I
Class II
Class III
Class V
Class VI
Class IV
Class VII
Temperature and Luminosity
• Class 0- Hypergiant Stars• Class I- Bright Supergiants
Class Ia0: hypergiants /extremely luminous supergiants
Class Ia: luminous supergiants
Class Iab: intermediate luminous supergiants
Class Ib: less luminous supergiants
• Class II- SupergiantsClass IIa: β Scuti-like stars
Class IIab: HR 8752 Cassiopeiae-like stars
Class IIb: HR 6902 Ophiuchi-like stars
• Class III- Normal Giants
Class IVa: ε Reticuli-like stars
Class IVab
Class IVb : HR 672A Ceti-like stars
• Class IV- Subgiants
Class IIIa: ρ Persei-like stars
Class IIIab: δ Reticuli-like stars
Class IIIb: Pollux-like stars
• Class V- Main Sequence Dwarf Stars
Class Vz: LH10:3102-like stars
Class Vb: 85 Pegasi A-like stars
Class VabClass Va: AD Leonis-like stars
• Class VI- Subdwarf Stars
esd (Extreme Subdwarf Stars)
sd (Subdwarf Stars)
• Class VII- White Dwarf Stars
