| Summary: | 碩士 === 國立清華大學 === 物理學系 === 88 === We computed the ratio of the heated-polar-cap area to the entire stellar surface taking into account the effect of gravity for PSR B0656+14 and PSR B1055-52, whose spectra can be fit with two blackbody components. Adopting the interpretation that the soft thermal component is from the entire surface and the hard one is from a heated polar cap, we study the dependence of the ratio on the assumed polar-cap size, geometry and surface gravity. Compared with observations, we may obtain some model constraints.
Our results show that the heated-polar-cap size of PSR B0656+14
should be at least four times its canonical value.For not involing too large a polar cap, the pulsar's magnetic axis and the line of sight should be close to the rotation axis,and the mass of the pulsar may be more than two times of solar mass.
However, in the case of PSR B1055-52,the heated-polar-cap size must be less than one-third of its canonical polar-cap size.
It is possible that the reheating only occurs at the edge of the polar cap.
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