New Sources of Hard X-rays from the Fastest Stellar Winds

Details New Sources of Hard X-rays from the Fastest Stellar Winds New Sources of Hard X-rays from the Fastest Stellar Winds

Oct 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005xmm..prop...10o&link_type=abstract

XMM-Newton Proposal ID #04002501

Physics

Stars, White Dwarfs, Solar System, Wr 142, Xmm-Newton Proposal 04002501

Scientific paper

We predict that WO-type stars are sources of hard X-rays. Their chemically enriched and radiatively driven stellar winds have velocities up to 5500 km/s. The theory of shocked stellar wind predicts that the X-ray temperature scales with the square of wind velocity, hence WO winds shall emit the hardest X-rays among all massive stars. We propose to obtain an EPIC spectrum of closest WO-type star and infer the temperature of X-ray emitting plasma. We request 50 ksec observation of WR 142 in order to: 1) investigate new galactic sources of hard X-rays; 2) study the physics of extreme stellar winds; 3) validate the theory of X-ray production in massive star winds; 4) complete the sample of spectral types of massive stars observed with XMM-Newton and Chandra.

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