Young Stellar X--Rays: Chandra Observations of the σ Orionis Cluster

Details Young Stellar X--Rays: Chandra Observations of the σ Orionis Cluster Young Stellar X--Rays: Chandra Observations of the σ Orionis Cluster

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aas...203.7706a&link_type=abstract

American Astronomical Society Meeting 203, #77.06; Bulletin of the American Astronomical Society, Vol. 35, p.1324

Astronomy and Astrophysics

Astronomy

1

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 stars in the region and characterize their properties.In addition, we searched for young Brown Dwarfs (BDs) in the region. The σ 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.
Here we present source properties for about 190 detected young stars. About 5% of these stars flare. We have optical colors for about 175 and these and about 75 are coincident with 2MASS sources. We have detected 4 components of the σ Orionis quintuplet. We also present the detection of 4 BD sources though there is a sudden dropoff in X-ray detections for cluster members with I>16.
This work was supported in part by NASA contract NAS8-39073 and NASA grant GO2-3019A. This research has made use of the 2MASS database.

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