Other
Scientific paper
Jul 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sfet.confe..47a&link_type=abstract
"Star Formation in the Era of Three Great Observatories, meeting abstracts from the conference held July 13-15, 2005 in Cambridg
Other
Scientific paper
The 5 Myr old Upper Scorpius Association, due to its proximity (145 pc) and low interstellar absorption, allows a detailed study of the X-ray emission from PMS stars. We present the results of the analysis of XMM observations of two Upper Scorpius regions. We detected 224 X-ray sources among which we identified 21 Upper Scorpius probable members on the basis of the 2MASS and DENIS photometry. The selected Upper Scorpius sample includes 7 WTTS, while the nature of the remaining 14 sources it is not known. Except the high mass star HD 142578 (spectral type A2), all the other detected Upper Scorpius sources are low mass stars of spectral type ranging from K to late M. The spectral analysis of the most intense sources indicates plasma temperature of ˜10 MK, resembling the typical coronal emission of active main sequence stars. We study the abundance vs. temperature pattern of Upper Scorpius sources and compare it with that observed for active stars. The Kolmogorov-Smirnov test proves that 67% of the detected X-ray Upper Scorpius sources were variable during the observation, and some of them displayed large flare-like events.
Argiroffi Costanza
Favata Fabio
Maggio Antonio
Micela Giuseppina
Peres Giovanni
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