Measuring Doppler Shifts of X-Ray Lines to Determine the Stellar Wind X-Ray Locations in OB Stars

Details Measuring Doppler Shifts of X-Ray Lines to Determine the Stellar Wind X-Ray Locations in OB Stars Measuring Doppler Shifts of X-Ray Lines to Determine the Stellar Wind X-Ray Locations in OB Stars

Sep 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999cxo..prop...43w&link_type=abstract

Chandra Proposal ID #01200366

Physics

Chandra Proposal Id #01200366

Scientific paper

For almost 20 years we have been trying to determine the source of the X-ray emission in OB stars. It is generally believed that this emission is caused by a distribution of stellar wind shocks. The AXAF grating spectrometers will provide the ultimate test of X-ray models. The shock model predicts that X-ray lines must be Doppler blue-shifted, hence, our primary objective is to measure these blue-shifts. MARX simulations show that the expected X-ray line shifts will be at least 4 times the MEG1 energy resolution limit. ASCA observations have provided stronger constraints on X-ray models, but they have also raised additional questions (e.g., X-ray abundance anomalies). The large number of X-ray lines predicted by MARX simulations will allow us to probe X-ray densities and abundances.

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