Surface Atomic Spectral Lines from Weakly Magnetic Rotating Neutron Stars

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Neutron Stars, Stellar Spectra, Stellar Rotation, Spectral Line Breadth, Neutron Stars, Luminosities, Magnitudes, Effective Temperatures, Colors, And Spectral Classification, Atomic And Molecular Data, Spectra, And Spectral Parameters, Stellar Rotation

Scientific paper

The profiles of atomic spectral lines from the surfaces of neutron stars can provide important information about stellar structure and the emission geometry, which in turn may help constrain models of the high density cold matter in the cores of neutron stars. An observed surface line will be affected by several physical effects, such as Doppler shifts (due to stellar rotation), special relativistic beaming, gravitational redshifts, light-bending, and frame-dragging. We have computed theoretical models for such lines, taking all these effects into account in the context of weakly magnetized, rapidly rotating neutron stars in low-mass X-ray binaries. We find that the stellar radius-to-mass ratio can be inferred from surface line profiles to better than 5%, even for a broad and asymmetric observed line. Our results also indicate that a signature of frame-dragging may be detected from future detailed studies of the shapes of surface atomic lines.

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