- For other uses, see Class A.
An example of an A-class star.
An A-class (or A-type) star is a stellar classification for stars composed of strong hydrogen and some ionized metals. The temperature ranges from 7,500 to 10,000 Kelvin, generally referred to as being blue-white or light blue in color. (ST reference: Star Charts)
Type A0 V stars are 50 times brighter than Sol and have 2.7 times more mass. Their habitable zone ranges from 5.5-9.3 AU and are 200 million to 1.2 billion years old. Type A5 V stars are 10 times brighter than Sol and have 1.8 times more mass. Their habitable zone ranges from 2.5-4.2 AU and are 500 million to 3 billion years old. (Decipher RPG module: Worlds)
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| Stellar classification | |
|---|---|
| By class and type | class O blue-violet star • class B blue star • class A blue-white star • class F white star (white dwarf) • class G yellow star (yellow dwarf • yellow giant) • class K orange star (orange giant) • class M red star (red dwarf • red giant • red supergiant) • boson star • brown dwarf • green star • N-type star • R-type star • S-type star • D-type star |
| By size or makeup | black hole/black star • carbon star • dwarf star (brown dwarf • red dwarf • white dwarf • yellow dwarf) • giant star (blue giant • red giant • orange giant • yellow giant) • Lazarus star • microstar • neutron star (collapsar • magnetar • pulsar) • protostar • supergiant • hypergiant • variable star • white hole • Wolf-Rayet star |