Chandra X-Ray Observations of the Young Open Cluster NGC 2516

Details Chandra X-Ray Observations of the Young Open Cluster NGC 2516 Chandra X-Ray Observations of the Young Open Cluster NGC 2516

May 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003apj...588.1009d&link_type=abstract

The Astrophysical Journal, Volume 588, Issue 2, pp. 1009-1024.

Astronomy and Astrophysics

Astronomy

17

Galaxy: Open Clusters And Associations: Individual: Ngc Number: Ngc 2516, Stars: Coronae, X-Rays: Stars

Scientific paper

We present a comprehensive study of the Chandra X-ray observations of the young open cluster NGC 2516. We have analyzed eight individual Chandra observations. We have combined the data to achieve the greatest sensitivity, reaching down to logfX=-14.56 (ergs s-1 cm -2), or logLX=28.69 (ergs s-1) at the distance of NGC 2516. Out of 284 X-ray sources detected, 155 are identified with photometric cluster members, with very little ambiguity. We have studied the X-ray luminosity functions for the various spectral types, correcting for nonmember contamination those for later type stars. We find strong X-ray emission from a couple of B stars that cannot be due to companions. Among A stars, chemically peculiar stars show a detection fraction much larger than normal A stars. The luminosity functions decrease monotonically from F to M stars, and those for K stars are significantly lower than similar stars in the Pleiades, a cluster only slightly younger than NGC 2516. We discuss possible causes of this discrepancy, including differences in age and stellar rotation.

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