  Bremsstrahlung emission of photons during nuclear reactions inside dense
stellar medium is investigated in the paper. For that, a new model of nucleus
is developed, where nuclear forces combine nucleons as bound system in
dependence on deep location inside compact star. A polytropic model of stars at
index $n=3$ with densities characterized from white dwarf to neutron star is
used. Bremsstrahlung formalism and calculations are well tested on existed
experimental information for scattering of protons of light nuclei in Earth. We
find the following. (1) In neutron stars a phenomenon of dissociation of
nucleus is observed --- its disintegration on individual nucleons, starting
from some critical distance between this nucleus and center of star with high
density. We do not observe such a phenomenon in white dwarfs. (2) In the white
dwarfs, influence of stellar medium imperceptibly affects on bremsstrahlung
photons. Also, we have accurate description of bremsstrahlung photons in
nuclear reactions in Sun. (3) For neutron stars, influence of stellar medium is
essentially more intensive and it crucially changes the bremsstrahlung
spectrum. The most intensive emission is from bowel of the star, while the
weakest emission is from periphery.
