The Drop in X-ray Flux at Spectral Type B1: Evidence for a B-Star Dividing Line?

Details The Drop in X-ray Flux at Spectral Type B1: Evidence for a B-Star Dividing Line? The Drop in X-ray Flux at Spectral Type B1: Evidence for a B-Star Dividing Line?

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010xmm..prop...41w&link_type=abstract

XMM-Newton Proposal ID #06709904

Physics

Stars, White Dwarfs, Solar System, Delta Lup, Gamma Lup, Gamma Ori

Scientific paper

All B star luminosity classes show a substantial drop in their X-ray emission between spectral type B1 and B2 suggesting an H-R diagram B-star dividing line somewhat analogous to the one for K giants. This emission appears to be related to the bi-stability jump at spectral type B1. But our analyses of B supergiant and giant XMM data revealed several interesting and unexpected results that do not support theoretical predictions. There seems to be a fundamental, unknown, underlying process at work in this spectral region. We now wish to extent our study by requesting XMM EPIC observations of 4 B main sequence stars and 1 additional B giant to help us explain the abrupt X-ray changes that are occurring in this intriguing region of the H-R diagram.

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