Measurements and analysis of helium-like triplet ratios in the X-ray spectra of O-type stars

Details Measurements and analysis of helium-like triplet ratios in the X-ray spectra of O-type stars Measurements and analysis of helium-like triplet ratios in the X-ray spectra of O-type stars

2006-06-15

arxiv.org/abs/astro-ph/0606370v1

Astrophys.J.650:1096-1110,2006

Astronomy and Astrophysics

Astrophysics

52 pages, 24 figures. Accepted in ApJ

Scientific paper

10.1086/507147

We discuss new methods of measuring and interpreting the forbidden-to-intercombination line ratios of helium-like triplets in the X-ray spectra of O-type stars, including accounting for the spatial distribution of the X-ray emitting plasma and using the detailed photospheric UV spectrum. Measurements are made for four O stars using archival Chandra HETGS data. We assume an X-ray emitting plasma spatially distributed in the wind above some minimum radius R_0. We find minimum radii of formation typically in the range of 1.25 < R_0 / R_* < 1.67, which is consistent with results obtained independently from line profile fits. We find no evidence for anomalously low f/i ratios and we do not require the existence of X-ray emitting plasmas at radii that are too small to generate sufficiently strong shocks.

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