  Recently, unprecedentedly accurate data on the orbital motion of stars in the
vicinity of the Sagittarius $ {\rm A^*}$ have been available. Such information
can be used not only to constrain the mass of the supermassive black hole
(SMBH) in the Galactic center but also to study the source of the radio
emission. Two major competing explanations of the radio spectrum of the
Sagittarius $ {\rm A^*}$ are based on two different models, that is, hot
accretion disk and jet. Hence, independent observational constraints are
required to resolve related issues. We explore the possibility of using the
observational data of the star S2, currently closest to the Galactic center, to
distinguish physical models for the radio emission of the Sagittarius $ {\rm
A^*}$, by applying the stellar cooling model to the Sagittarius $ {\rm A^*}$
with the orbital parameters derived from the observation. The relative
difference in the electron temperature due to the stellar cooling from the star
S2 at the pericenter is a few parts of a thousand and the consequent relative
radio luminosity difference is order of $10^{-4}$. Therefore, one could
possibly expect to observe the radio flux variation with a periodic or
quasi-periodic modulation in the frequency range at $\nu \la {\rm 100 MHz}$ if
the radiatively inefficient hot accretion flows are indeed responsible for the
radio emission, contrary to the case of a jet. According to our findings, even
though no periodic radio flux variations have been reported up to date a
radiatively inefficient hot accretion disk model cannot be conclusively ruled
out.
