Coronal and Transition Region Heating Due to Magnetic Activity on Metal-Poor Dwarf Stars

Details Coronal and Transition Region Heating Due to Magnetic Activity on Metal-Poor Dwarf Stars Coronal and Transition Region Heating Due to Magnetic Activity on Metal-Poor Dwarf Stars

Jul 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008hst..prop11829b&link_type=abstract

HST Proposal ID #11829. Cycle 17

Physics

Scientific paper

How does low metallicity affect the heating and resultant temperature structure of the chromospheres, transition regions, and coronae of old solar-like dwarf stars? Our ACIS-S observations of 7 Gyr old Arcturus Moving Group {AMG} dwarfs show very little conventional coronal {> 1 MK} plasma and suggest that these stars have insufficient magnetic energy input to power a solar-like corona. However, they do have chomospheres and transition regions similar to the minimum activity Quiet Sun. It this typical or an aberration of the AMG? We propose a 35 ksec ACIS-S observation and HST COS spectroscopy of the nearest {9.2 pc}, truely metal-poor {[Fe/H] = -1.4} dwarf star that is known to have definite magnetic dynamo activity {activity cycles, active region modulation} - HD103095 - to investigate this question further.;

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