The Cool and Hot Coronae of HR 1099

Computer Science

Scientific paper

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Chandra Proposal Id #02200371

Scientific paper

Chandra offers unique possibilities for the study of emission measure distributions of stellar coronae over a wide range of temperatures. At the same time, high-resolution spectroscopy determines unambiguously the abundances of chemical elements. Previous solar/stellar observations have indicated `anomalies' in the coronal elemental composition. The present investigation addresses the question of whether abundance anomalies are dependent on the temperature of coronal plasma in one and the same star. In particular, the observation concentrates on the cooler part of the emission measure distribution of a very active binary system (HR1099). The LETGS offers unique access to different ionization stages of various elements not accessible by previous observations.

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