Nucleosynthesis temperature for he burning according to theoretical models the stellar core temperature for fusion of 'he occurs at about 2x10 ok. the ashes from 'he burning are "c, i"o and 'ne. once the sun has converted most of its hydrogen into he the core temperature has changed from 15x10f k to the higher temperature for "he burning. a) using a very simplified model of constant density for the sun we discussed an approximation to determine the temperature at the core of a body of the sun's mass and radius. here we used the gravitational fome acting on the proton as it falls into the center to compute the work done on the proton. reproduce this calculation. let the proton start at the radius of the sun with negligible kinetic energy b) assume the sun loses negligible mass to produce a core of 'he. using the same approximation as in part a), what would be the new radius of the sun to achieve a core temperature of 2x10 °k? where m j. 3rmo e 3 2 3 2 -23