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We revisit the problem of radial pulsations of neutron stars by computingfour general-relativistic polytropic models, in which "density" and "adiabaticindex" are involved with their discrete meanings: (i) "rest-mass density" or(ii) "mass-energy density" regarding the density, and (i) "constant" or (ii)"variable" regarding the adiabatic index. Considering the resulting fourdiscrete combinations, we construct corresponding models and compute for eachmodel the frequencies of the lowest three radial modes. Comparisons withprevious results are made. The deviations of respective frequencies of theresolved models seem to exhibit a systematic behavior, an issue discussed herein detail.

Radial pulsations of neutron stars: computing alternative polytropic models regarding density and adiabatic index