Except they're pretty much just humans when they're around any other kind of sun. But the 'charge' of the sun seems to linger pretty well, considering Batman had to deal with him and his powers even though it was in the middle of the night and Superman was breathing in kryptonite dust. So that means even if the Saiyans teleported him to an arena where the sun was red, Supes would be able to win if he won fast. And, since they're supposedly powered by the radiation in the sun's rays, Superman would have a limitless power supply if he just flew into space, no matter what kind of sun was up there, and since he could break the sound barrier when he was impeded by an atmosphere, imagine how fast he could go in space?
Therefore, if the entirety of Superman Co. (Or any batch of kryptonians) goes to space and flies into the center of a blue or yellow sun for awhile, the entire Saiyan race is boned. Boned, I say! And besides, it's not like the Saiyans can attack them through the sun or anything. I'm no expert in DBZ lore, but I'm pretty sure none of them have survived being inside of stars before.