Well, the alpha centauri is a tertiary system.
Alpha Centauri A is the main star (type G2) of this tertiary system, similar to our sun (also type G2) thought abit larger.
The other two are an orange dwarf Alpha Centauri B (type K1) and a small red dwarf, Alpha Centauri C (type M5) aka 'Proxima Centauri'.
More info from here
homepage.sunrise.ch/homepage/schatzer/Alpha-Centauri.html
[ November 26, 2003, 18:04: Message edited by: Me Loonn ]