Application of Laboratory and Modeling Capabilities to Extreme Ultraviolet Spectroscopy of Astrophysical Sources
Description
Work funded by the subject LDRD proposal has produced the following results. First, a comprehensive catalog of EUV lines from M-shell iron (Fe IX-XVI) in the 60-140 (angstrom) waveband. Second, a revised estimate of the radiative cooling of high-temperature plasmas by Fe, which dominates the cooling in cosmic-abundance plasmas from 4 x 105K to 1 x 107K. Third, laboratory data to correct theoretical atomic models and develop reliable spectral models of M-shell Fe in the EUV. Fourth, a solution of the origin of the quasi-continuum in EUV spectra of late-type stars, which has been variously ascribed to a high-temperature tail on the emission measure distribution of stellar coronae, reduced metal abundances, resonant scattering (destruction) of emission lines, and incompleteness of atomic models
Availability note (English)
Available from PURL: https://www.osti.gov/servlets/purl/792653-ndfPRN/native/Additional details
Identifiers
Publishing Information
- Imprint Pagination
- 540 Kilobytes
- Report number
- UCRL-ID--138205
INIS
- Country of Publication
- United States
- Country of Input or Organization
- United States
- INIS RN
- 34019478
- Subject category
- S74: ATOMIC AND MOLECULAR PHYSICS;
- Resource subtype / Literary indicator
- Non-conventional Literature
- Descriptors DEI
- ATOMIC MODELS; EXTREME ULTRAVIOLET SPECTRA; IRON; M SHELL; RADIATIVE COOLING; RESONANCE SCATTERING; STELLAR CORONAE
- Descriptors DEC
- ATMOSPHERES; COOLING; ELECTRONIC STRUCTURE; ELEMENTS; INELASTIC SCATTERING; MATHEMATICAL MODELS; METALS; SCATTERING; SPECTRA; STELLAR ATMOSPHERES; TRANSITION ELEMENTS; ULTRAVIOLET SPECTRA
Optional Information
- Contract/Grant/Project number
- W-7405-Eng-48
- Funding organization
- USDOE Office of Defense Programs (DP) (United States)