Stellar coronal spectroscopy with the Chandra HETGS

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Title: Stellar coronal spectroscopy with the Chandra HETGS
Author: Huenemoerder, David; Boroson, Bram; Schulz, Norbert; Canizares, Claude; Buzasi, Derek; Preston, Heather; Kastner, Joel
Abstract: Spectroscopy with the Chandra High Energy Transmission Grating Spectrometer (HETGS) 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 (WTT), with TW Hya, a Classical T Tauri star (CTT). 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.
Description: Also archived in: arXiv: astro-ph/0310319 v1 11 Oct 2003Published in: Stars as suns : activity, evolution and planets, Proceedings of the 219th symposium of the International Astronomical Union held during the IAU General Assembly XXV, Sydney, Australia, 21-25 July 2003. Edited by A.K. Dupree and A.O. Benz. San Francisco, CA: Astronomical Society of the Pacific (ASP), 2004, p.238
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Date: 2004-01

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