Anomalous Coronae of Yellow Giants and Supergiants

Details Anomalous Coronae of Yellow Giants and Supergiants Anomalous Coronae of Yellow Giants and Supergiants

Oct 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005xmm..prop...47a&link_type=abstract

XMM-Newton Proposal ID #04011804

Computer Science

Stars, White Dwarfs, Solar System, Hd 209750, Hd 204867, Xmm-Newton Proposal 04011804

Scientific paper

EPIC-pn spectra of "X-ray deficient" yellow giants and supergiants will explore why these stars display anomalous coronal behavior compared with cooler giants only slightly further advanced in their evolution. Among the class-III objects, the sharp transition in coronal properties on the way to helium flash might be caused by disruption of a "fossil" magnetosphere by a newly born solar-like dynamo. But, the class-I supergiants are post-flash, and a second deficiency mechanism likely applies, perhaps highly extended chromospheric envelopes obscuring X-rays from submerged magnetic loops. A key discriminator is the coronal energy distribution, especially the presence of enhanced soft absorption.

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