Coronal Dynamics and the Complete Flare Energy Budget for the M Dwarf AD Leo

Computer Science

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Hst Proposal Id #9271

Scientific paper

We will carry out six orbits {two visits of 4 and 2 orbits duartaion} of STIS E140M TIME-TAG mode spectroscopy of the active red dwarf star AD Leo, coordinated wth Chandra-HETGS {50 ksec} observations, to accurately measure for the first time the complete energy budget of stellar coronal flares. FUV observations of the Fe XXI 1354 A coronal forbidden lines are needed from STIS to determine the dynamical energy losses of the flares. Chandra HETGS spectra will be used to measure the temporal changes in the coronal emission measure, temperature, density, and elemental abundances. AD Leo is one of the brightest dMe stars in the ultraviolet and X-ray regions and flaring rate data suggests that we should see about 10 moderate {factor of a few} and one large {factor of 10-20 enhancement} flares in a 30 hour observation. Ground-based optical and radio monitoring will also be attempted.

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