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arXiv:astro-ph/0504296 (astro-ph)
[Submitted on 13 Apr 2005 (v1), last revised 6 Jun 2005 (this version, v3)]

Title:Chandra HETGS Multi-Phase Spectroscopy of the Young Magnetic O Star theta^1 Orionis C

Authors:Marc Gagne, Mary E. Oksala, David H. Cohen, Stephanie K. Tonnesen, Asif ud-Doula, Stanley P. Owocki, Richard H. D. Townsend, Joseph J. MacFarlane
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Abstract: We report on four Chandra grating observations of the oblique magnetic rotator theta^1 Ori C (O5.5 V) covering a wide range of viewing angles with respect to the star's 1060 G dipole magnetic field. We employ line-width and centroid analyses to study the dynamics of the X-ray emitting plasma in the circumstellar environment, as well as line-ratio diagnostics to constrain the spatial location, and global spectral modeling to constrain the temperature distribution and abundances of the very hot plasma. We investigate these diagnostics as a function of viewing angle and analyze them in conjunction with new MHD simulations of the magnetically channeled wind shock mechanism on theta^1 Ori C. This model fits all the data surprisingly well, predicting the temperature, luminosity, and occultation of the X-ray emitting plasma with rotation phase.
Comments: 52 pages, 14 figures (1 color), 6 tables. To appear in the Astrophysical Journal, 1 August 2005, v628, issue 2. New version corrects e-mail address, figure and table formatting problems
Subjects: Astrophysics (astro-ph)
Cite as: arXiv:astro-ph/0504296
  (or arXiv:astro-ph/0504296v3 for this version)
  https://doi.org/10.48550/arXiv.astro-ph/0504296
Journal reference: Astrophys.J.628:986-1005,2005; Erratum-ibid.634:712,2005
Related DOI: https://doi.org/10.1086/430873

Submission history

From: Marc Gagne [view email]
[v1] Wed, 13 Apr 2005 14:03:15 UTC (469 KB)
[v2] Fri, 22 Apr 2005 19:00:41 UTC (523 KB)
[v3] Mon, 6 Jun 2005 11:42:25 UTC (469 KB)
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