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By National Research Council, Division on Engineering and Physical Sciences, Mathematics, and Applications Commission on Physical Sciences, Board on Physics and Astronomy, Space Studies Board, Committee on Astronomy and Astrophysics

ISBN-10: 0309058279

ISBN-13: 9780309058278

Committee on Astronomy and Astrophysics, house experiences Board, Board on Physics and Astronomy, arithmetic, and purposes fee on actual Sciences, department on Engineering and actual Sciences, nationwide learn Council

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The current calculations still cannot give sufficient asymmetry to account for pulsar runaway velocities whose rates are often 500 km/s or more. Neutron Stars Neutron stars continue to be an exciting research frontier. ROSAT's observation of soft x-ray emission from single pulsars has supported the idea that the cooling of a neutron star is controlled by ordinary matter in its core, rather than by some more exotic form of matter. One of the most dramatic recent developments in the study of binary neutron stars is the Rossi X-Ray Timing Explorer's (RXTE's) discovery of the long-sought millisecond spin periods in low-mass x-ray binaries.

This task requires largecollecting-area, x- and gamma-ray imaging and spectroscopy. To determine whether the "annihilation" line in some black hole transients is due to positrons or to a blend of spallation gamma rays requires high-resolution, time-dependent, hard x-ray and MeV spectroscopy. ORIGIN OF THE ELEMENTS Elements heavier than lithium are produced in stars by complex processes, and quantitative understanding of the chemical enrichment of the Milky Way and external galaxies is still rather primitive.

6. Mapping the coldest parts of the interstellar medium in selected atomic and molecular emission lines and in broadband thermal emission from dust grains. This task will require the development of spectroscopy in the submillimeter and far-infrared bands. CONCLUSIONS For many years, astronomers have speculated that there should be planets around other stars, but only recently have extrasolar planets actually been detected. We now stand at the threshold of discovering both the nature of extrasolar planetary systems and how they came about.

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A New Science Strategy for Space Astronomy and Astrophysics by National Research Council, Division on Engineering and Physical Sciences, Mathematics, and Applications Commission on Physical Sciences, Board on Physics and Astronomy, Space Studies Board, Committee on Astronomy and Astrophysics


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