Monthly Archives: August 2011

Atomic physics of shocked plasma in the winds of massive stars

Maurice Leutenegger (NASA/GSFC/CRESST/UMBC),  David Cohen (Swarthmore College), Stan Owocki (Bartol Research Institute) High resolution diffraction grating spectra of x-ray emission from massive stars obtained with Chandra and XMM-Newton have revolutionized our understanding of their powerful, radiation-driven winds. Emission line shapes and line ratios … Continue reading

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Application of X-ray plasma diagnostics to nova winds

Jan-Uwe Ness (European Space Astronomy Centre, ESA) The X-ray plasma diagnostics of optically thin plasma in collisional equilibrium as developed for coronal plasma can also be applied to other astrophysical environments to which the underlying assumptions apply. The technique of reconstructing … Continue reading

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Plasma diagnostics for planetary nebulae and H II regions using N II and O II

I. McNabb (1), X. Fang (1), X.-W. Liu (1,2), P.J. Storey (3) (1) Kavli Institute of Astronomy and Astrophysics at Peking University. (2) Department of Astronomy at Peking University. (3) Department of Physics and Astronomy at University College London We … Continue reading

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New light element opacities from the Los Alamos ATOMIC code

J. Colgan (*), D. P. Kilcrease (*), N. H. Magee, Jr. (*), J. Abdallah, Jr. (*), M. E. Sherrill (*), C. J. Fontes (#), H. L. Zhang (#) (*) Theoretical Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USA. (#) Computational Physics … Continue reading

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Atomic data needs for X-ray analysis and AtomDB v2.0

Randall Smith (1), Adam Foster (1), Nancy Brickhouse (1), Li Ji (2), Tim Kallman (3) (1) Smithsonian Astrophysical Observatory.  (2) Purple Mountain Observatory. (3) NASA Goddard Space Flight Center. Although the analysis of even CCD-resolution X-ray spectra benefits from good-quality atomic data, … Continue reading

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Neon and oxygen in stellar coronae – a unification with the Sun

Jan Robrade (Hamburger Sternwarte, Germany) We use high-resolution X-ray spectra from a sample of weakly and moderately active stars to determine their coronal Ne/O abundance ratio and to investigate an enhanced neon abundance as solution of the solar modeling problem. … Continue reading

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An R-matrix approach for plasma modelling and the interpretation of astrophysical observation

Connor Ballance (Department of Physics, Auburn University, Auburn, AL 36830, USA) Over the last decade an Auburn-Rollins-Strathclyde consortium has developed several suites of parallel Rmatrix codes [1] that can meet the fundamental data needs required for the interpretation of astrophysical observation … Continue reading

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