Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008head...10.1312s&link_type=abstract
American Astronomical Society, HEAD meeting #10, #13.12
Astronomy and Astrophysics
Astrophysics
1
Scientific paper
The HETG Orion Legacy Project aims to study high energy plasma properties of a large number of highly resolved X-ray spectra from young stars over a large range of masses and evolutionary stages. The spectra are collected throughout the lifetime of Chandra and thus not only provide highly significant X-ray line strengths for detailed plasma diagnostics but also long-term X-ray monitoring.
The heart of the Orion Nebula Cluster with a dynamic age of 300000 yr is one of the youngest and closest star forming regions to our Sun and contains an ensemble of the youngest stars the Galaxy. The survey produces emission measure distributions and allows us to perform
plasma diagnostics using H-, He-, Li-like lines in over a dozen stars. We investigate the hypothesis further that X-ray production in very young massive stars is consistent with the standard model but very weak and low in energy unless there
is enhancement by additional processes. The survey produces HETG spectra for about a dozen of mostly K-type T Tauri stars various quality levels.
By spreading the observing time over many Chandra observation cycles the recording of HETG spectra of a few serendipitous flares is anticipated.
This work was supported by NASA through the Smithsonian Astrophysical Observatory (SAO) contract SV3-73016 for the Chandra
X-Ray Center and Science Instruments.
Canizares Calude R.
Huenemoerder David P.
Schulz Norbert S.
Testa Paola
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