X-Rays From Brown Dwarfs In The σ Orionis Cluster

Details X-Rays From Brown Dwarfs In The σ Orionis Cluster X-Rays From Brown Dwarfs In The σ Orionis Cluster

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aas...201.4608a&link_type=abstract

American Astronomical Society, 201st AAS Meeting, #46.08; Bulletin of the American Astronomical Society, Vol. 34, p.1176

Astronomy and Astrophysics

Astronomy

2

Scientific paper

We have recently made a deep Chandra X--Ray Observatory observation of the young star forming region around σ Orionis. The goal of this HRC-I observation is to detect X-ray emission from young brown dwarfs (BDs) which have been discovered there. Detections of BDs by Chandra have been somewhat mixed with about 60 total published detections. This is, in part, because the detector of choice for clusters, ACIS-I, has very low effective area where BDs are brightest in X-rays, below 400 eV. The σ Ori cluster is uniquely suited to this study: it spans different stellar interior conditions (nearly 3 orders of magnitude in mass), it is relatively close and almost dust free (5% that of the ONC), its age is such that it has a good mix of stars with and without disks, and we have measured its mass function to well below the BD limit. This work is supported by the Chandra X-ray Center NASA Contract NAS8-39073 and by Chandra guest observer grant G02-3019A.

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