Physics
Scientific paper
Feb 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001noao.prop..223j&link_type=abstract
NOAO Proposal ID #2001A-0223
Physics
Scientific paper
NGC 2516 is a rich, young open cluster at a similar age to the Pleiades but a factor of two lower metallicity. It has become the focus of attention for studying how metallicity can affect convective processes such as dynamo generated coronal activity and the mixing and depletion of light elements (Li, Be). The cluster has been extensively observed by Chandra and XMM-Newton, which detect many low mass (0.3-1.0M_&sun;) X-ray cluster candidates. Our aims here are to: (1) Construct a catalogue of cluster members that is unbiased with respect to X-ray emission and Li abundance, using a combination of photometry, proper motions and radial velocities. (2) Use this catalogue to investigate the dependence of coronal X- ray emission on metallicity. (3) Directly test models of pre-main sequence evolution and surface Li depletion. These predict that low mass stars in NGC 2516 should have suffered an order of magnitude less Li depletion than analogues in the Pleiades. CTIO+Hydra offers a world class facility that will enable us to obtain accurate radial velocities, clearly identifying the cluster members, and simultaneously allowing photospheric Li measurements in stars with much lower masses and deeper convection zones than previously possible.
Harnden Frank R. Jr.
Jeffries Robin D.
Micela Giuseppina
N2516 Chandra/XMM Teams
Sciortino Salvatore
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