Astronomy and Astrophysics – Astronomy
Scientific paper
May 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...204.6214o&link_type=abstract
American Astronomical Society Meeting 204, #62.14; Bulletin of the American Astronomical Society, Vol. 36, p.774
Astronomy and Astrophysics
Astronomy
Scientific paper
Chandra High-Energy Grating spectra obtained at four rotational phases of θ 1 Ori C (O6-7 V), corresponding to four different viewing angles with respect to the magnetic axis, are used to constrain the temperature, spatial location, and kinematics of the hot plasma on this very young hot star with a strong (1100 G) dipole field. The plasma is moving, but only at speeds of a few 100 km s-1, much slower than the terminal wind velocity. It is close to the star (within 1.5 R* of the surface) and hot (peak temperature 30 MK). We analyze these diagnostics in conjunction with new MHD simulations of the magnetically channeled wind shock mechanism on θ 1 Ori C. This model fits all the data surprisingly well, reproducing the very high temperatures, relatively narrow and unshifted lines, and the near-star source location.
Cohen Doron
Gagne Marc
MacFarlane Joseph J.
Oksala Mary
Owocki Stanley
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