Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21345414g&link_type=abstract
American Astronomical Society, AAS Meeting #213, #454.14; Bulletin of the American Astronomical Society, Vol. 41, p.352
Astronomy and Astrophysics
Astronomy
Scientific paper
High-resolution x-ray spectra of single and binary high-mass stars observed with the Chandra and XMM gratings in the 6-30 Å region show resolved, sometimes asymmetric line profiles of highly ionized N, O, Ne, Mg, Si, S and Fe. The line profiles are being used to probe mass-loss in the winds of some of the most luminous single stars like ζ Puppis (O4 If). Meanwhile, the forbidden-to-intercombination line ratio of the He-like ions are being used to localize the X-ray emitting regions around many hot, massive stars. The f/i ratios have been used to show, for example, that the x-rays from magnetic stars like θ1 Orionis C (O6 V) arise close to the stellar photosphere, suggesting magnetic confinement, while the x-rays from Wolf-Rayet binaries are produced further away, in a wind interaction zone between the stars. The superior effective area of the CAT grating spectrometer on IXO will allow similar studies to be undertaken for a larger, more distant sample of stars spanning a range of masses, mass-loss rates, ages, and binary separations and with higher time cadence to look for dynamic phenomena. The high efficiency of the XMS microcalorimeter will allow us to detect rapid changes in temperature, column density and emission measure. The unsurpassed spectral resolution of the XMS at high energies will probe the very hottest, time variable lines of Ca XIX, Fe XXV, Fe XXVI and Fe Kα.
Cohen Doron
Gagne Marc
Huenemoerder Dave
Leutenegger Maurice
Osten Rachel
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