Resolving the 36 Oph and 70 Oph Binary Systems and Correlating Their Coronal Properties with Their Winds

Details Resolving the 36 Oph and 70 Oph Binary Systems and Correlating Their Coronal Properties with Their Winds Resolving the 36 Oph and 70 Oph Binary Systems and Correlating Their Coronal Properties with Their Winds

Sep 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003cxo..prop.1381w&link_type=abstract

Chandra Proposal ID #05200142

Physics

Chandra Proposal Id #05200142

Scientific paper

We propose to observe two nearby (d=5 pc) K dwarf binary systems, 36 Oph and 70 Oph, with Chandra's LETGS grating. Recent measurements of the winds of 36 Oph and 70 Oph from HST data suggest that their mass loss rates differ by a factor of 8 despite almost identical levels of activity. The winds of solar-like stars originate in their coronae, so the coronal X-ray spectra of these stars is a natural place to search for the cause of this difference. Our Chandra observations will resolve these binary systems for the first time in X-rays, so our two binaries should provide four high quality LETGS spectra, from which we can determine coronal abundances, densities, and emission measure distributions for all four stars.

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