XMM-Newton Proposal 02015603

Details XMM-Newton Proposal 02015603 XMM-Newton Proposal 02015603

Mar 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003xmm..prop...86a&link_type=abstract

XMM-Newton Proposal ID #02015603

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Hd 432, Hd 6903, Hd 72779, Xmm-Newton Proposal 02015603

Scientific paper

Objectives of the proposal are twofold: (1) obtain EPIC-pn spectra of three key "X-ray deficient" Hertzsprung gap stars, to explore why these F2-G0 giants display anomalous coronal behavior compared with G/K dwarfs; and (2) record deep RGS spectra of four other gap giants, 3 of which were observed previously by Chandra, to capture the O VII He-like triplet and other faint, but important, diagnostics beyond the reach of H/LETGS. Interpretations will be based on comparisons of derived emission measure distributions, and FIP, MAD, inverse-FIP abundance behavior, with RGS and H/LETGS X-ray spectra of stars previously collected. A sharp transition in coronal properties on the way to He-flash might be due to disruption of a "fossil" magnetosphere by a nascent solar-like dynamo.

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