Fluorescence and Optical Depth: New Probes of Coronal Geometry

Details Fluorescence and Optical Depth: New Probes of Coronal Geometry Fluorescence and Optical Depth: New Probes of Coronal Geometry

Sep 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999cxo..prop...65d&link_type=abstract

Chandra Proposal ID #01200472

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Chandra Proposal Id #01200472

Scientific paper

Our proposed 100ks LETG+ACIS-S observation of the X-ray bright active star sigma Gem will yield a wealth of X-ray plasma line diagnostics that will give us a giant leap forward in our understanding of its coronal densities, abundance anomalies and emission measure distribution. Unfortunately, there is one very basic unanswered question in the physics of active stellar coronae that the usual plasma diagnostics cannot address directly: What are the spatial characteristics of stellar coronae---the scale height and filling factor? What do other stellar coronae actually look like? We will provide the first direct spectroscopic answers to this question through two novel diagnostics of coronal geometry: photospheric fluorescence and resonance line optical depths.

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