Statistics – Methodology
Scientific paper
Jul 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sfet.confe..52m&link_type=abstract
"Star Formation in the Era of Three Great Observatories, meeting abstracts from the conference held July 13-15, 2005 in Cambridg
Statistics
Methodology
Scientific paper
We present preliminary results of a detailed X-ray spectral analysis of 55 sources in the Chandra Orion Ultra-deep field, identified with late-type stars and having more that 10^4 extracted counts. The aim of this analysis is to provide a census of element abundances in the coronae of these young stars, and to study possible dependences of such abundances on the magnetic activity level, the presence of circumstellar disks, indicators of accretion, and the properties of the local environment. We present here the methodology of such an analysis and results related to the thermal structure of the selected sources, their global metallicity, and abundance determinations for some individual elements. In particular, we show that the COUP X-ray bright sources tend to be metal poor (Fe abundances less than half the solar one, with most frequent values of 0.1-0.2 solar), while they show a larger scatter of Ne abundances, and Ne/Fe ratios from ˜1 up to ˜10.
Favata Fabio
Feigelson Eric D.
Flaccomio Ettore
Maggio Antonio
Micela Giuseppina
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