Using LETG Spectra to Probe Anomalous Heating in the Upper Atmospheres of B Stars

Details Using LETG Spectra to Probe Anomalous Heating in the Upper Atmospheres of B Stars Using LETG Spectra to Probe Anomalous Heating in the Upper Atmospheres of B Stars

Sep 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003cxo..prop.1396c&link_type=abstract

Chandra Proposal ID #05200705

Physics

Chandra Proposal Id #05200705

Scientific paper

Measurements from both EUVE and H-alpha maps of HII regions in the sky show that near-Main Sequence B stars have anomalously strong EUV fluxes. We propose using LETG with ACIS-S to observe the two particularly well studied Beta Cephei variable stars Beta CMa and Spica (Alpha Vir) to diagnose the physical conditions of the X-ray regions and derive information regarding the heating of the outer atmosphere (the EUV formation region and upward). We will investigate if these stars are showing a transition in X-ray production from the wind shock sources of the luminous O stars to the denser magnetically confined regions of cool stars.

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