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

Type Conference Paper
Names Joy S. Nichols, W. Waldron, J. Cassinelli, N. Walborn, A. Mitschang
Proceedings Title Bulletin of the American Astronomical Society
Conference Name American Astronomical Society, Head Meeting #10, #29.08
Volume 10
Date March 1, 2008
Short Title HETG Emission Line Analysis of Stellar Wind Parameters
URL http://adsabs.harvard.edu/abs/2008HEAD...10.2908N
Library Catalog NASA ADS
Abstract 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.
UW-Madison Astronomy Home