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XMM-NEWTON SURVEY OF THE CHAMAELEON I STAR FORMING REGION

A Telleschi, M Udel, K Briggs, M Audard
unpublished
We present results of an XMM-Newton survey of the Chamaeleon I star forming region. In the five exposures we detected a total of 449 X-ray sources. Among them 96 are counterparts to the 138 spectroscopically confirmed members in the surveyed region; six of them have a spectral type later than M6.5 and are therefore classified as brown dwarfs. The spectra of the brighter sources were analyzed using a continuous emission-measure model composed of two power laws in temperature, as suggested from
more » ... as suggested from high-resolution X-ray spectroscopy. We investigate correlations between the derived X-ray lumi-nosity and stellar properties such as rotation rate, mass and bolometric luminosity. We find a deviation from the galactic N H /A J relation in Chamaeleon I that could be explained with a larger characteristic dust-grain size.
fatcat:z2ho4a6455hidouggmtobha3hu