XMM-Newton Proposal 02015503

Details XMM-Newton Proposal 02015503 XMM-Newton Proposal 02015503

Mar 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003xmm..prop...85w&link_type=abstract

XMM-Newton Proposal ID #02015503

Physics

Gamma Ara, Zeta Per, J Pup, Xmm-Newton Proposal 02015503

Scientific paper

The stellar winds of B supergiants (SGs) go through a discontinuous jump in their terminal velocities and mass loss rates at spectral type B1 which is referred to as the bistability of B SGs. Since wind shocks produce the X-ray emission and are highly dependent on the stellar wind parameters, B SGs provide a natural laboratory to study the relationship between the radiative force, stellar wind, and X-ray emission. We are requesting EPIC-pn observations of 4 known B SG X-ray sources located at or near the bistability jump. The X-ray fluxes show a decrease, but the cause is not known. Spectral analyses of these EPIC observations will allow us to test the predictions of the stellar wind shock model.

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