Model atmospheres and radiation of magnetic neutron stars: Anisotropic thermal emission

Details Model atmospheres and radiation of magnetic neutron stars: Anisotropic thermal emission Model atmospheres and radiation of magnetic neutron stars: Anisotropic thermal emission

Sep 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...289..837p&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 289, no. 3, p. 837-845

Astronomy and Astrophysics

Astrophysics

77

Anisotropy, Neutron Stars, Power Spectra, Stellar Atmospheres, Stellar Magnetic Fields, Stellar Models, Thermal Radiation, Diffusion Theory, Polarization, Spectrum Analysis, Temperature Distribution

Scientific paper

We investigate the anisotropy of the thermal radiation emitted by a surface element of a neutron star atmosphere (e.g., by a polar cap of a radio pulsar). Angular dependences of the partial fluxes at various photon energies, and spectra at various angles are obtained for different values of the effective temperature Teff and magnetic field strength B, and for different directions of the magnetic field. It is shown that the local radiation of the magnetized neutron star atmospheres is highly anisotropic, with the maximum flux emitted in the magnetic field direction. At high B the angular dependences in the soft X-ray range have two maxima, a high narrow peak along B and a lower and broader maximum at intermediate angles. The radiation is strongly polarized, the modulation of the degree of polarization due to the rotation of the neurtron star may be much higher than that for the radiative flux. The results obtained are compared with recent ROSAT observations of the thermal-like radiation from the radio pulsars PSR 1929+10 and PSR J0437-4715.

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