The Fastest Stellar Winds as New Sources of Hard X-rays

Details The Fastest Stellar Winds as New Sources of Hard X-rays The Fastest Stellar Winds as New Sources of Hard X-rays

Oct 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007xmm..prop....7o&link_type=abstract

XMM-Newton Proposal ID #05502201

Computer Science

Stars, White Dwarfs, Solar System, Wr 142, Xmm-Newton Proposal Id #05502201

Scientific paper

Wolf-Rayet stars of the oxygen subclass (WO) are massive stars in their terminal evolutionary stage short before exploding as supernova or GRB. We predict that WO stars emit hard X-rays. They posses the fastest stellar winds among all non-degenerate stars, with velocities of 2 per cent of the speed of light. Strong shocks should develop in these winds and heat the plasma to 100 MK, resulting in X-ray emission. We request a 75 ksec observation of the closest WO star, WR 142, to obtain EPIC spectra and measure the parameters of the hot plasma, as a stringent test for the theory of X-ray production in hot star winds. In addition, our FoV will comprise 16 neighbouring OB stars. With their X-ray spectra we will probe the causality behind the correlation between bolometric and X-ray luminosity.

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