Red dwarfs are not failed stars. They are the lowest mass objects capable of nuclear fusion. Brown dwarfs are failed stars. Brown dwarfs officially start at 13 Jupiter masses, & have a maximum mass of 75 Jupiter's. Beyond that mass, fusion starts & the object is officially a star.
Red dwarfs are not failed stars. They are the lowest mass objects capable of nuclear fusion. Brown dwarfs are failed stars. Brown dwarfs officially start at 13 Jupiter masses, & have a maximum mass of 75 Jupiter's. Beyond that mass, fusion starts & the object is officially a star.