Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aspc..262...69w&link_type=abstract
The High Energy Universe at Sharp Focus: Chandra Science, held in conjunction with the 113th Annual Meeting of the ASP. ASP Conf
Astronomy and Astrophysics
Astronomy
4
Scientific paper
We discuss our HETG observational results and modeling efforts for two O stars, Zeta Orionis and Zeta Puppis. A variety of X-ray emission lines are observed as their associated ionic identifications indicate a range in HWHM of 600 - 1600 km/s. Several Doppler blue-shifted line profiles are observed which provides the clearest and most direct evidence that the X-ray sources are distributed throughout the stellar wind. Further confirmation for a wind distribution of X-ray sources comes from our analysis of He-like fir lines (S XV, SiXIII, MgXI, MeIX, and O VII). We discuss how the UV radiation sensitivity of the He-like fir lines can be used to determine the radial distribution of these He-like ions. We also find evidence that some of the observed X-ray emission may originate very close to the stellar surface which is contrary to standard wind shock models. preliminary results from our modeling efforts to fit these X-ray line profiles and the model constraints imposed by the data are presented.
Cassinelli Joe P.
Waldron Wayne L.
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