X-Rays from Brown Dwarfs in the Sigma Orionis Cluster

Details X-Rays from Brown Dwarfs in the Sigma Orionis Cluster X-Rays from Brown Dwarfs in the Sigma Orionis Cluster

Sep 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001cxo..prop..764w&link_type=abstract

Chandra Proposal ID #03200598

Physics

Chandra Proposal Id #03200598

Scientific paper

We propose a deep HRC-I observation of the young star forming region around Sigma Orionis to detect X--ray emission from young brown dwarfs (BDs) which have been discovered there. We will also measure of the X--ray luminosity of a well understood sample of hundreds of PMS stars. Detections of BDs by Chandra have been sparse, this is, in part, because the detector of choice for clusters, ACIS-I, has very low effective area where BDs are bright, below 400 eV. The Sigma Ori cluster is uniquely suited to this study; it spans different stellar interior conditions, almost 3 orders of magnitude in mass, it is relatively close, almost dust free (5% of the ONC), the proper age to have a good mix of stars with and without disks and we have measured its mass function well below the BD limit.

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