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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)




Stellar classification
By class and type class O blue-violet starclass B blue starclass A blue-white starclass F white star (white dwarf) • class G yellow star (yellow dwarfyellow giant) • class K orange star (orange giant) • class M red star (red dwarfred giant) • boson starbrown dwarfgreen starN-type starR-type starS-type starD-type star
By size or makeup black hole/black starcarbon stardwarf star (brown dwarfred dwarfwhite dwarfyellow dwarf) • giant star (blue giantred giantorange giantyellow giant) • Lazarus starmicrostarneutron star (collapsarmagnetarpulsar) • protostarsupergiant starvariable starwhite holeWolf-Rayet star