NOAO >   Observing Info >   Approved Programs >   2009A-0067

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Proposal Information for 2009A-0067


PI: Alexander Scholz, University of St. Andrews, as110@st-andrews.ac.uk
Address: School of Physics & Astronomy, North Haugh, St. Andrews, Fife KY16 9SS, 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 NGC2547

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. Rotation periods are available for only a handful of brown dwarfs with ages >5 Myr. Here we propose to obtain deep photometric monitoring for brown dwarfs in the 40 Myr old open cluster NGC2547. From the lightcurves, we expect to be able to measure rotation periods for at least 10-20 substellar objects, thus establishing the first significant sample of periods for evolved brown dwarfs. Combining the new periods with literature data 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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NOAO >   Observing Info >   Approved Programs >   2009A-0067

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