Chandra Detection of Doppler-shifted X-Ray Line Profiles from the Wind of ζ Puppis (O4 f)

摘要: We report on a 67 ks High-Energy Transmission Grating observation of the optically brightest early O star z Puppis (O4 f). Many resolved X-ray lines are seen in spectra over wavelength range 5–25 A u . Chandra has sufficient spectral resolution to study velocity structure isolated line profiles and distinguish individual forbidden, intercombination, resonance (fir) emission several He-like ions, even where components strongly Doppler-broadened. In contrast other hot stars, Pup shows blueshifted skewed profiles, providing clearest most direct evidence that Xray sources embedded stellar wind. The broader line, greater blueward centroid shift tends be. N vii at 24.78 is special case, showing flat-topped profile. This indicates it formed regions beyond wind attenuation. sensitivity ion fir strong UV radiation field used derive radial distances which S xv ,S ixiii ,M gxi ,N eix, originate. formation radii correspond well with continuum optical depth unity each complex, indicating distributed throughout However, form deeper than expected from standard wind-shock models. Subject headings: line: — stars: early-type ( Puppis) mass loss winds, outflows X-rays: stars