Protostars and Planets VI, Heidelberg, July 15-20, 2013

Poster 1K095

The HETG Orion Legacy Project: X-Ray Properties of Trapezium Stars

Schulz, Norbert S. (Massachusetts Institute of Technology)
Huenemoerder, David P. (Massachusetts Institute of Technology )
Testa, Paola (Center for Astrophysics)
Canizares, Claude R. (Massachuetts Institute of Technology )

The ONC is an ideal astrophysical laboratory to study very young stars. The HETG Orion Legacy Project is designed to obtain a large number of high-resolution X-ray spectra of very young late type pre-main sequence stars, and several young massive and intermediate mass stars. Its extreme proximity and youth makes the core of the ONC a Chandra legacy project involving the only high resolution spectroscopic study of young embedded cluster stars for decades to come. For several PMS stars we derive abundance fractions from temperature-insensitive line ratios using an approximation with respect to the non-detection of the O~VII line in most cases. From these fraction we consrtuct a single abundance distribution involving O, Mg, Ne, Si, S, Ar, and Fe to fit all X-ray spectra simultaneously. We compare this common abundance distribution to abundances determined recently in more massive Orion Trapezium stars and results from several other abundance studies of Orion stars and clusters.

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