NOAO >   Observing Info >   Approved Programs >   2006A-0115

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Proposal Information for 2006A-0115


PI: Leslie Hebb, Johns Hopkins University, leslieh@pha.jhu.edu
Address: Department of Physics and Astronomy, 3400 North Charles Street, Baltimore, MD 21218, USA

CoI: Jonathan Irwin, Cambridge University
CoI: Suzanne Aigrain, Cambridge University
CoI: Simon Hodgkin, Cambridge University
CoI: Estelle Moraux, LAOG, Grenoble

Title: Empirical mass determination for very low-mass stars and brown dwarfs in NGC 2516

Abstract: We have begun a large-scale program of time-resolved wide-field photometry on nearby young open clusters and star-forming regions (SFRs) with known age and metallicity, to search for low-mass eclipsing binary and planet systems (the Monitor project). We propose to use the CTIO- 4m+Mosaic to obtain photometry for NGC 2516, a nearby intermediate-age (~ 150 \rm Myr, distance modulus 7.7) open cluster, where we will measure ~ 1400 primaries with masses M < 0.4 \rm M_\odot over ~ 1 \rm sq.deg with sufficient precision to find eclipses. The goals of this project are (1) to make empirical mass determinations of very low-mass (VLM) pre-main-sequence (PMS) stars and brown dwarfs (BDs) at known age, to calibrate the mass-luminosity-radius relation and stellar models at the bottom of the main sequence and into the BD regime, (2) to detect the first planets orbiting stars younger than 200 \rm Myr, and measure their periods, masses (with radial velocity follow-up observations) and radii to place constraints on planet formation and evolution scenarios, and (3) to obtain rotation periods for members of a sample of open clusters, and examine the evolution of stellar rotation, up to an age of 200 \rm Myr.


National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360



NOAO >   Observing Info >   Approved Programs >   2006A-0115

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