Recent astrophysical models suggest that red dwarfs of may stay on the main sequence for some six to twelve trillion years, gradually increasing in both temperature and luminosity, and take several hundred billion years more to collapse, slowly, into a white dwarf. Such stars will not become red giants as the whole star is a convection zone and it will not develop a degenerate helium core with a shell burning hydrogen. Instead, hydrogen fusion will proceed until almost the whole star is helium.
rEcenT aStRoPhysIcaL moDels suggEsT THat reD dwarFS OF mAy STay on ThE main SeQuenCE fOR SomE six to Twelve trIlLIoN years, grAduallY incrEASinG in Both tempERaturE aNd lUminoSity, anD Take sEvERal hundred BIllion YeaRs MORe TO COLlapSe, slowly, intO A WhIte DWarf. such stArS wIll Not bEcoMe rEd giaNTs as the whole star is A ConVection zone ANd it WiLl nOT dEVElOP A DeGEnErate heliuM cOrE wIth a shell BurniNG HydRoGEn. instEad, HydRoGen fusioN wIll proceed UntIl alMOSt THe WhoLe StAR is heliUm.