Calibrating the time-evolution of the high-energy emissions of GKM stars

Details Calibrating the time-evolution of the high-energy emissions of GKM stars Calibrating the time-evolution of the high-energy emissions of GKM stars

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010xmm..prop...21r&link_type=abstract

XMM-Newton Proposal ID #06706504

Computer Science

Stars, White Dwarfs, Solar System, Nltt 7887, Nltt 28711, Nltt 29948, Nltt 39608

Scientific paper

A key element to understand planetary atmospheres (Solar System and exoplanets) is the time-evolution of the flux at short wavelengths (X-ray to UV) of the host stars, having direct impact on important questions related to photochemistry and evaporation. While the high-energy flux evolution is well understood for solar- type stars, this is not the case of the later K and M stars. The proposed XMM- Newton observations will allow us to build X-ray luminosity versus age calibrations by sampling the critical intermediate-age interval. This is done by measuring KM stars in wide binary pairs with white dwarf companions that we use as chronometers to determine reliable ages. The time-variation of coronal temperature will provide additional diagnostics useful to both exoplanets and dynamo theory.

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