Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-04-13
Astrophys.J.628:986-1005,2005; Erratum-ibid.634:712,2005
Astronomy and Astrophysics
Astrophysics
52 pages, 14 figures (1 color), 6 tables. To appear in the Astrophysical Journal, 1 August 2005, v628, issue 2. New version co
Scientific paper
10.1086/430873
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.
Cohen David H.
Gagne Marc
MacFarlane Joseph J.
Oksala Mary E.
Owocki Stanley P.
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