Other
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aas...212.4101b&link_type=abstract
American Astronomical Society, AAS Meeting #212, #41.01; Bulletin of the American Astronomical Society, Vol. 40, p.241
Other
Scientific paper
The analysis of spectra with atomic features leads to an understanding of the composition of astronomical objects, along with the temperature, density, mass, and mass motion that are present. This basic information has changed our picture of these objects in fundamental ways over the history of the field. A hundred years ago, the Sun was believed to be largely silicon, but the measurement of absorption cross sections, when applied within model atmospheres, showed that the Sun (and the entire universe) was primarily hydrogen. More recently, there was considerable uncertainty in understanding X-ray spectral energy distributions, especially in the 1-20 E6 K range, where the continuum is a blend of a vast number of lines. Through the diligent accumulation of atomic properties, obtained with both lab measurements and theory, we now have reliable models. The abundances deduced for this hot gas, such as in elliptical galaxies, is generally significantly higher than the early model results and it has changed the working picture for the origin and evolution of the gas. We discuss other interesting examples.
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