Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991stin...9219720l&link_type=abstract
Presented at the 7th International Symposium on High Voltage Engineering (ISH-7), Dresden, Fed. Republic of Germany, 26-30 Aug.
Astronomy and Astrophysics
Astrophysics
Accretion Disks, Atomic Structure, Cosmic X Rays, Gravitational Fields, Photoionization, Stellar Luminosity, X Ray Sources, Astrophysics, Emission Spectra, Iron, Line Spectra, Plasma Diagnostics, Plasmas (Physics), Radiation Sources, X Ray Spectra
Scientific paper
Compact X ray sources derive their luminosities from the conversion of gravitational potential energy through accretion. A centrally produced hard X ray continuum photoionizes the surrounding accretion flow, which can produce discrete X ray emission. To date, as applied to compact X ray sources, a detailed diagnostic approach to the analysis of spectroscopic data has been largely ineffective, owing to the limited quality of available line spectra and the lack of appropriate models of X ray line emission in the presence of an ionizing continuum radiation field. We are involved in an atomic modeling program to investigate the discrete spectral response to variations in ambient plasma conditions, with the aim of establishing a new set of plasma diagnostics appropriate to this physical regime. We discuss the physical mechanisms and applications of several of the diagnostics which have been discovered in the Fe L-shell spectrum, under conditions appropriate to X ray photoionized plasmas.
Goldstein William H.
Kahn Steve M.
Liedahl Duane Allen
Osterheld Albert L.
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