Evidence for the Importance of Resonance Scattering in X-Ray Emission Line Profiles of the O Star Zeta Puppis

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We fit the Doppler profiles of the He-like triplet complexes of O VII and N VI in the X-ray spectrum of the O star {zeta} Pup, using XMM-Newton RGS data collected over {approx} 400 ks of exposure. We find that they cannot be well fit if the resonance and intercombination lines are constrained to have the same profile shape. However, a significantly better fit is achieved with a model incorporating the effects of resonance scattering, which causes the resonance line to become more symmetric than the intercombination line for a given characteristic continuum optical depth {tau}{sub *}. We discuss the ... continued below

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Leutenegger, M.A.; U., /Columbia; Owocki, S.P.; Inst., /Bartol Research; Kahn, S.M.; /KIPAC, Menlo Park et al. October 10, 2006.

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We fit the Doppler profiles of the He-like triplet complexes of O VII and N VI in the X-ray spectrum of the O star {zeta} Pup, using XMM-Newton RGS data collected over {approx} 400 ks of exposure. We find that they cannot be well fit if the resonance and intercombination lines are constrained to have the same profile shape. However, a significantly better fit is achieved with a model incorporating the effects of resonance scattering, which causes the resonance line to become more symmetric than the intercombination line for a given characteristic continuum optical depth {tau}{sub *}. We discuss the plausibility of this hypothesis, as well as its significance for our understanding of Doppler profiles of X-ray emission lines in O stars.

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  • Journal Name: Astrophys.J.659:642-649,2007

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  • Report No.: SLAC-PUB-12152
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 893300
  • Archival Resource Key: ark:/67531/metadc874963

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  • October 10, 2006

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  • Sept. 21, 2016, 2:29 a.m.

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  • Nov. 28, 2016, 1:47 p.m.

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Leutenegger, M.A.; U., /Columbia; Owocki, S.P.; Inst., /Bartol Research; Kahn, S.M.; /KIPAC, Menlo Park et al. Evidence for the Importance of Resonance Scattering in X-Ray Emission Line Profiles of the O Star Zeta Puppis, article, October 10, 2006; [Menlo Park, California]. (digital.library.unt.edu/ark:/67531/metadc874963/: accessed September 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.