HETG Emission Line Analysis of Stellar Wind Parameters: Very Early O-Type Stars

Details HETG Emission Line Analysis of Stellar Wind Parameters: Very Early O-Type Stars HETG Emission Line Analysis of Stellar Wind Parameters: Very Early O-Type Stars

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008head...10.2908n&link_type=abstract

American Astronomical Society, HEAD meeting #10, #29.08

Astronomy and Astrophysics

Astronomy

Scientific paper

We present the Chandra HETG spectra of two massive, very early O-type stars, HD93129AB and HD93250, comparing with those from later O-type stars. Two valuable X-ray emission line diagnostics are examined: 1) the He-like f/i line ratios which provide information on the stellar wind radial locations of the X-ray sources, and; 2) the H-like to He-like line ratios that can be used to determine the associated X-ray temperatures of these sources. The results for these massive early O-stars are checked for consistency with the general radial-dependent relationship between the X-ray temperatures and the fir-inferred radii as found by Waldron and Cassinelli (2007). In addition, these fir-inferred radii are also compared to their respective X-ray continuum optical unity radii.

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