Limits on rotation-induced characteristics of radiation from stable rapidly rotating neutron stars

Abstract

Results are presented of a study of frequency shifts in radiation from the surface of rapidly rotating neutron stars and rotation-induced spectral line broadening as a function of their mass. It is found that, despite large rotation rates, the gravitational effects dominate over the Doppler contribution to the frequency shifts over the allowed mass range of a stable rotating neutron star. Astrophysical implications of effect of large rotation on spectral line characteristics are also discussed.