Bragg diffraction and the Iron crust of cold Neutron Stars

Details Bragg diffraction and the Iron crust of cold Neutron Stars Bragg diffraction and the Iron crust of cold Neutron Stars

2009-05-29

arxiv.org/abs/0905.4837v3

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

20 pages, 4 figure files, accepted at Astrophysics and Space Science

Scientific paper

If cooled-down neutron stars have a thin atomic crystalline-iron crust, they must diffract X-rays of appropriate wavelength. If the diffracted beam is to be visible from Earth, the illuminating source must be very intense and near the reflecting star. An example is a binary system composed of two neutron stars in close orbit, one of them inert, the other an X-ray pulsar (perhaps an "anomalous" X-ray pulsar or magnetar, not powered by gas absorption from the companion or surrounding space, would be the cleanest example). The observable to be searched for is a secondary peak added (quasi-) periodically to the main X-ray pulse. The distinguishing feature of this secondary peak is that it appears at wavelengths related by simple integer numbers, lambda, lambda/2, lambda/3... lambda/n because of Bragg's diffraction law.

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