A Study of the Discontinuous Drop in X-ray Emission at Spectral Type B1

Details A Study of the Discontinuous Drop in X-ray Emission at Spectral Type B1 A Study of the Discontinuous Drop in X-ray Emission at Spectral Type B1

Oct 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006xmm..prop..132w&link_type=abstract

XMM-Newton Proposal ID #05035002

Physics

Stars, White Dwarfs, Solar System, Beta Cma, Kappa Sco, Xmm-Newton Proposal 05035002

Scientific paper

B supergiants display a discontinuous drop in X-ray emission along a dividing line in the H-R diagram (analogous to the one for K giants) which is referred to as the bistability jump at spectral type B1. Our XMM study of the X-ray properties on both sides of the jump have revealed several interesting results, but some uncertainties have arisen since B supergiant winds are thick to soft X-rays, and these winds are thought to be clumpy. We now have observational evidence that the bistabilty jump extends to the lower luminosity B giants which have lower wind densities. Hence, they do not have the problems that are associated with B supergiants. Therefore we are requesting XMM EPIC observations of 5 B giants to broaden our understanding of the B star dividing line.

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