Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998stin...0025443d&link_type=abstract
Conference Paper, MPE; SRON
Astronomy and Astrophysics
Astrophysics
Observation, Stellar Coronas, Plasma Diagnostics, X Ray Fluorescence, Anomalies, Diagnosis, High Resolution, Optical Thickness, Photosphere, Scale Height, Spectroscopy, X Ray Astrophysics Facility, X Ray Spectroscopy
Scientific paper
High resolution AXAF and XMM observations of stellar coronae will yield a wealth of X-ray plasma line diagnostics that will provide a giant leap forward in our understanding of coronal densities, abundance anomalies and emission measure distributions. 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? I will discuss two novel diagnostics of coronal geometry and their application to future X-ray spectra: photospheric fluorescence and resonance line optical depths.
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