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The value of density measurements in stellar coronae

Abstract:
The grating instruments on board Chandra and XMM-Newton now allow measurements of electron densities. These rely on the ratios of fluxes in emission lines, where one line depends on both collisional and radiative decay rates. The electron density is required to constrain the physical extent of the emitting region, and large samples of measurements are of interest in the context of trends in coronal activity. Here we discuss the important He I-like ions and the differences in densities that result when different current data bases are used.
Publication status:
Published

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Institution:
University of Oxford
Department:
Oxford, MPLS, Physics, Theoretical Physics
Volume:
774
Pages:
187-189
Publication date:
2005
ISSN:
0094-243X
URN:
uuid:c323ba02-ed07-4d7a-9d69-3ddb8c157331
Source identifiers:
25482
Local pid:
pubs:25482
ISBN:
0-7354-0259-0

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