The B Supergiant Bistability-Jump in X-ray Emission

Details The B Supergiant Bistability-Jump in X-ray Emission The B Supergiant Bistability-Jump in X-ray Emission

Oct 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005xmm..prop...40w&link_type=abstract

XMM-Newton Proposal ID #04010501

Physics

Stars, White Dwarfs, Solar System, J Pup, Xmm-Newton Proposal 04010501

Scientific paper

The stellar winds of B supergiants (BSgs) go through a discontinuous jump in their terminal velocities, mass loss rates, and X-ray emission at spectral type B1 which is referred to as the bistability of BSg winds. Since wind shocks produce the X-ray emission and are highly dependent on the stellar wind parameters, BSgs provide a natural laboratory to study the relationship between the radiative force, stellar wind, and X-ray emission. Although the drop in X-ray flux appears consistent with theoretical predictions, our AO-3 XMM observations of 2 BSgs at the jump indicate severe problems with current theory. We are requesting one additional EPIC observation of J Pup (B0.5 Ib), a BSg located near the bistability jump, to determine the extent of these problems.

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