  MAXI J0556-332 is the hottest transient accreting neutron star at the
beginning of its quiescence. A theoretical model with crustal heating indicates
that an additional shallow heat source of Qshallow > 6 MeV per accreted nucleon
is required in the shallow outer crust with respect to the deeper star crust by
considering the observed decline in accretion rate at the end of outburst.
However, the physical source of this shallow heating is still unclear. In the
present investigation, we performed stellar evolutionary calculations, adopting
the effects of outburst behavior of the accretion rate. As a consequence, we
find that the quiescent light curve of MAXI J0556-332 can be well explained by
the nuclear energy generation due to the hot CNO cycle.
