This is not my theory but in the book I am presently reading the author mentions that all stars have cold cores .
He notes that the super giants such as Betelgeux and Antares contradict present theories of star formation because these stars having huge masses somehow did not adhere to the effects of gravity whereby a star such as our sun accumulated its mass and when its supposedly nuclear core ignited then it pushed away the remaining debri to later form our planets .This then he states must mean that gravity has an ignition limit, that is to say that no matter how slow or fast a proto star forms then the pressure is built up to the same point of ignition hence this means that the two huge stars mentioned above accumulated their mass contradictive to gravity and its effects , how then could these two stars acquire their masses ! .

I tend to agree with the author that we presently observe that all things burn from the outside inwards so his theory that stars have cold cores seems feasible to me that the two mentioned stars are not two bloated super giants but just two huge stars whos ignition burning from the outside inwards is only at the molten stage and is then the reason why these stars are red , but hey you make your own mind up or read the book because I am open to all kinds of open minded views and find this alternative theory feasible and I tend to agree in parts or should I say it opens up new areas to investigate .