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
Committee on Astronomy and Astrophysics, area reports Board, Board on Physics and Astronomy, arithmetic, and functions fee on actual Sciences, department on Engineering and actual Sciences, nationwide examine Council
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4. Improving quantitative understanding of the physics of supernovae and associated nucleosynthesis. Of particular importance to the multiwavelength spectroscopic studies required to address this task are observations in the infrared, where lines of important species are unblended and easier to analyze. Also important are gamma-ray observations of freshly produced radioactive species such as 56Ni, 56Co, 44Ti, and positrons. The pioneering work of ASCA should be followed in the coming decade with studies of spectra of supernova remnants of sufficiently high resolution that temperature, density, ionization state, and abundance effects can be sorted out and abundances can be deduced.
However, detailed studies of the chemical compositions of giant stars in globular clusters have revealed star-to-star anomalies that may indicate nucleosynthesis and mixing within individual stars at levels not predicted by standard theories of stellar evolution. Studies of faint main sequence stars will indicate the extent to which abundance anomalies arise because of mixing or because the cloud from which the cluster formed was inhomogeneous. Many of the key resonance lines of heavy elements, especially those created by the r-process, fall in the ultraviolet and hence require space-based observations.
How does the relationship between age and metallicity vary with location in the Milky Way and elsewhere? • How did quasars manage to produce a solar distribution of heavy elements so quickly? • What are the mechanisms by which globular clusters and the lowest-metallicity stars are enriched? About this PDF file: This new digital representation of the original work has been recomposed from XML files created from the original paper book, not from the original typesetting files. Page breaks are true to the original; line lengths, word breaks, heading styles, and other typesetting-specific formatting, however, cannot be retained, and some typographic errors may have been accidentally inserted.
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