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

Metadata describes a digital item, providing (if known) such information as creator, publisher, contents, size, relationship to other resources, and more. Metadata may also contain "preservation" components that help us to maintain the integrity of digital files over time.

Title

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

Creator

  • 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

Contributor

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

Publisher

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

Date

  • Creation: 2006-06-19

Language

  • English

Description

  • 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

Subject

  • 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

Source

  • Journal Name: Astrophysical Journal

Collection

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

Institution

  • Name: UNT Libraries Government Documents Department
    Code: UNTGD

Resource Type

  • Article

Format

  • Text

Identifier

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

Note

  • Display Note: http://www.slac.stanford.edu/cgi-wrap/pubpage?slac-pub-11909.html