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Stellar Coronal Spectroscopy with the Chandra HETGS

Published online by Cambridge University Press:  26 May 2016

David P. Huenemoerder ,
Bram Boroson ,
Norbert S. Schulz ,
Claude R. Canizares ,
Derek L. Buzasi ,
Heather L. Preston  and
Joel H. Kastner
David P. Huenemoerder
Affiliation:
Massachusetts Institute of Technology, 77 Vassar St., Cambridge, MA 02139 USA
Bram Boroson
Affiliation:
Massachusetts Institute of Technology, 77 Vassar St., Cambridge, MA 02139 USA
Norbert S. Schulz
Affiliation:
Massachusetts Institute of Technology, 77 Vassar St., Cambridge, MA 02139 USA
Claude R. Canizares
Affiliation:
Massachusetts Institute of Technology, 77 Vassar St., Cambridge, MA 02139 USA
Derek L. Buzasi
Affiliation:
U.S. Air Force Academy, Colorado Springs, CO 80840-6254 USA
Heather L. Preston
Affiliation:
U.S. Air Force Academy, Colorado Springs, CO 80840-6254 USA
Joel H. Kastner
Affiliation:
Rochester Institute of Technology, Rochester, NY 14623 USA

Abstract

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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.

Type
Part 5: Stellar Magnetic Activity and Evolution
Information
Symposium - International Astronomical Union , Volume 219: Stars as Suns : Activity, Evolution and Planets , 2004 , pp. 238 - 242
Copyright
Copyright © Astronomical Society of the Pacific 2004 

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