Abstract
Spectroscopy with the Chandra High Energy Transmission Grating Spectrometer
provides details on X-ray emission and activity from young and cool stars
through resolution of emission lines from a variety of ions. We are beginning
to see trends in activity regarding abundances, emission measures, and
variability. Here we contrast spectra of TV Crt, a weak-lined T Tauri star,
with TW Hya, a Classical T Tauri star. TV Crt has a spectrum more like magnetic
activity driven coronae, relative to the TW Hya spectrum, which we have
interpreted as due to accretion-produced X-rays. We have also observed the long
period system, IM Pegasi to search for rotational modulation, and to compare
activity in a long period active binary to shorter period systems and to the
pre-main sequence stars. We detected no rotational modulation, but did see
long-duration flares.