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 )
Abstract:
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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