Modeling of atomic and cyclotron lines in the emergent spectra of rotating neutron stars with various distributions of temperature over the star surface is carried out. General and special relativity effects are taken into account in the radiation transfer calculations. A novel method of analysis based on the Fourier series expansion of the observed spectra over rotation frequencies is proposed. It is shown that the mutual influence of the gravitational bending of light rays and rotation of the star leads to the formation of strong features (sometimes several features at once) in the Fourier-harmonic spectrum, whereas these features remain almost invisible in both the integrated and dynamic spectra. Possible application of the obtained results to the interpretation of absorption features in the spectrum of the single neutron star 1E 1207.4 − 5209 is discussed.
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Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Radiofizika, Vol. 54, No. 5, pp. 335–347, May 2011.
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Garasyov, M.A., Derishev, E.V. & Kocharovsky, V.V. Modeling of spectral features in the dynamic spectra of neutron stars. Radiophys Quantum El 54, 304–315 (2011). https://doi.org/10.1007/s11141-011-9292-6
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DOI: https://doi.org/10.1007/s11141-011-9292-6