Privoditsya obzor rabot, posvyashchennykh obosnovaniyu sushchestvovaniya zvezd naseleniya III. Rassmotreny voprosy, svyazannye s ikh ustoychivost'yu i evolyutsiey. Po kompelyatsionnym dannym chislennogo modelirovaniya zvezd s nulevym soderzhaniem metallov privedeny astrofizicheskie kharakteristiki pervykh zvezd. Dlya zvezd s blizkim k nulyu soderzhaniem metallov postroeny zavisimosti dlya vremeni goreniya vodoroda i svetimosti ot ikh mass nulevogo vozrasta. Postroeny zavisimosti bolometricheskikh velichin, svetimostey, mass i radiusov ot effektivnykh temperatur. Dlya vsekh zavisimostey privedeny sootvetstvuyushchie approksimatsionnye formuly i provedeno sravnenie s analogichnymi zavisimostyami dlya zvezd diska.