Measurements and Analysis of Helium-Like Triplet Ratios in the X-Ray Spectra of O-Type Stars Metadata

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  • Main Title Measurements and Analysis of Helium-Like Triplet Ratios in the X-Ray Spectra of O-Type Stars


  • Author: Leutenegger, Maurice A.
    Creator Type: Personal
  • Author: Paerels, Frits B.S.
    Creator Type: Personal
  • Author: /Columbia U., Astron. Astrophys.
    Creator Type: Personal
  • Author: Kahn, Steven M.
    Creator Type: Personal
  • Author: /SLAC
    Creator Type: Personal
  • Author: Cohen, David H.
    Creator Type: Personal
  • Author: Coll., /Swarthmore
    Creator Type: Personal


  • Sponsor: United States. Department of Energy.
    Contributor Type: Organization


  • Name: Stanford Linear Accelerator Center
    Place of Publication: [Menlo Park, California]
    Additional Info: SLAC


  • Creation: 2006-06-19


  • English


  • Content Description: We discuss new methods of measuring and interpreting the forbidden-to-intercombination line ratios of helium-like triplets in the X-ray spectra of O-type stars, including accounting for the spatial distribution of the X-ray emitting plasma and using the detailed photospheric UV spectrum. Measurements are made for four O stars using archival Chandra HETGS data. We assume an X-ray emitting plasma spatially distributed in the wind above some minimum radius R{sub 0}. We find minimum radii of formation typically in the range of 1.25 < R{sub 0}/R{sub *} < 1.67, which is consistent with results obtained independently from line profile fits. We find no evidence for anomalously low f/i ratios and we do not require the existence of X-ray emitting plasmas at radii that are too small to generate sufficiently strong shocks.
  • Physical Description: 52 pages


  • STI Subject Categories: 71 Classical And Quantum Mechanics, General Physics
  • Keyword: X-Ray Spectra Astrophysics,Astro
  • Keyword: Spatial Distribution
  • Keyword: Stars
  • Keyword: Triplets
  • Keyword: Astrophysics,Astro
  • Keyword: Plasma


  • Journal Name: Astrophysical Journal


  • Name: Office of Scientific & Technical Information Technical Reports
    Code: OSTI


  • Name: UNT Libraries Government Documents Department
    Code: UNTGD

Resource Type

  • Article


  • Text


  • Report No.: SLAC-PUB-11909
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 884888
  • Archival Resource Key: ark:/67531/metadc892235


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