Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aipc.1094..333s&link_type=abstract
COOL STARS, STELLAR SYSTEMS AND THE SUN: Proceedings of the 15th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun.
Astronomy and Astrophysics
Astronomy
X-Ray Emission Spectra And Fluorescence, Star Formation, Astronomical And Space-Research Instrumentation
Scientific paper
We are analyzing high-resolution Chandra ACIS-S/HETGS long integration spectra for a sample of young stars, including classical, weak-lined, and post-T Tauri stars as well as a young main sequence star. We have identified flaring and quiescent periods, based on overall X-ray luminosity, for several of the stars. We have measured line fluxes in the He-like ions separately in the flaring and quiescent epochs to determine forbidden-to-intercombination line ratios. Results from out analysis of four wTTS and one post-T Tauri star with Chandra/HETGS are included in this presentation. The temperature and density diagnostics for V987 Tau indicate that X-rays are emitted by a cool, high density plasma in the quiescent phase.
Huenemoerder David
Kastner Joel
Schulz Norbert
Shukla Sonali J.
Testa Paola
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