The value of density measurements in stellar coronae

Conference item

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.

Journal:: X-Ray Diagnostics of Astrophysical Plasmas: Theory, Experiment, and Observation More from this journal
Volume:: 774
Pages:: 187-189
Publication date:: 2005-01-01
Event title:: Annual Scientific Session on High-Temperature Superconductivity
ISSN:: 0094-243X
ISBN:: 0735402590

Keywords:: stellar activity

stellar atmospheres

x-ray spectra

x-ray observations

density-functional theory
Pubs id:: pubs:25482
UUID:: uuid:c323ba02-ed07-4d7a-9d69-3ddb8c157331
Local pid:: pubs:25482
Source identifiers:: 25482
Deposit date:: 2012-12-19

Licence:: Terms and Conditions of Use for Oxford University Research Archive

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