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Fig. 10


Beam pattern models for a hollow column with a halo of scattered radiation on the neutron star surface. θ has the same meaning as in Fig. 8. The minimum is produced when observer looks in the direction of the accretion stream. Left: fixed column thickness αo − αi = 0.06 rad and different opening angles αo = 0.2 rad (solid line), αo = 0.15 rad (dashed line), αo = 0.1 rad (dotted line). Right: fixed outer opening angle αi = 0.1 rad and different column thickness αo − αi = 0.02 rad (solid line), αo − αi = 0.04 rad (dashed line) and αo − αi = 0.06 rad (dotted line).

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