NOAO >   Observing Info >   Approved Programs >   2009B-0090

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Proposal Information for 2009B-0090


PI: Alexander Scholz, University of St. Andrews, as110@st-andrews.ac.uk
Address: School of Physics & Astronomy, North Haugh, St. Andrews, Fife KY168SR, United Kingdom

CoI: Jerome Bouvier, LAOG Grenoble, France
CoI: Jochen Eisloeffel, Thueringer Landessternwarte Tautenburg, Germany
CoI: Jonathan Irwin, Harvard-Smithsonian CfA, USA

Title: The rotation of brown dwarfs: photometric monitoring in NGC2264

Abstract: The spins of stars are fundamentally related to basic stellar physics. As a result, we can use observed rotation rates as an indicator for magnetic properties and to constrain stellar ages and radii. Since rotation periods can be measured with high accuracy, this is a highly useful parameter to study stellar evolution. As of today, however, the rotational database is severely lacking periods at very low masses, specifically in the substellar range. After a successful observing campaign in the 40 Myr old cluster NGC2547 in Februar 2009 (2009A-0067), we now propose to obtain deep photometric monitoring for brown dwarfs in the 2 Myr old open cluster NGC2264. From the lightcurves, we expect to be able to measure rotation periods for 20-40 substellar objects, thus establishing the first significant sample of periods for brown dwarfs. Combining the new periods with the results from our first run will allow us to probe disk-locking, constrain radii, and calibrate models for the spindown due to stellar winds at substellar masses.


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