NDLI: Atomic physics of shocked plasma in winds of massive stars

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Atomic physics of shocked plasma in winds of massive stars

Content Provider	NASA Technical Reports Server (NTRS)
Author	Leutenegger, Maurice A. Cohen, David H. Owocki, Stanley P.
Copyright Year	2012
Description	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 provide diagnostics on a number of key wind parameters. Modeling of resolved emission line velocity profiles allows us to derive independent constraints on stellar mass-loss rates, leading to downward revisions of a factor of a few from previous measurements. Line ratios in He-like ions strongly constrain the spatial distribution of Xray emitting plasma, confirming the expectations of radiation hydrodynamic simulations that X-ray emission begins moderately close to the stellar surface and extends throughout the wind. Some outstanding questions remain, including the possibility of large optical depths in resonance lines, which is hinted at by differences in line shapes of resonance and intercombination lines from the same ion. Resonance scattering leads to nontrivial radiative transfer effects, and modeling it allows us to place constraints on shock size, density, and velocity structure
File Size	345180
Page Count	8
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_20150000161
Archival Resource Key	ark:/13960/t1rg0r02s
Language	English
Publisher Date	2012-05-25
Access Restriction	Open
Subject Keyword	Physics Atomic Plasma Stellar Winds Plasmas Physics Radiation Emission Stellar Radiation Massive Stars Solar Wind Velocity Atomic Physics Ionizing Radiation X Rays Radiative Transfer Optical Thickness Line Spectra Resonance Lines Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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