NOAO >   Observing Info >   Approved Programs >   2006B-0581

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Proposal Information for 2006B-0581


PI: Will Clarkson, Space Telescope Science Institute, clarkson@stsci.edu
Address: Science Division, 3700 San Martin Drive, Baltimore, MD 21218, USA

CoI: Tom Marsh, Warwick University
CoI: Andrew Norton, The Open University
CoI: John Thorstensen, Dartmouth College
CoI: Fraser Lewis, Cardiff University

Title: A Near-IR Velocity Study of Bright Intermediate Polars

Abstract: Intermediate Polars (IP's) provide key opportunities to study the accretion/outflow process in the presence of high magnetic fields, within systems still in a state of dynamical evolution. Time-resolved optical spectroscopic campaigns have shown complex accretion geometry, with several equally-consistent interpretations in some cases. Near-IR time-resolved spectroscopic have tremendous potential to unlock the secrets of these complex systems, in three key areas: (i) by allowing joint IR-optical constraints on the velocity-evolution and thus the accretion geometry, (ii) by assessing if the puzzling C-underabundance in Cataclysmic Variables as a class also extends to the IP's, and (ii) by establishing metrics which will be essential in understanding the highly-obscured IP's such as XY Ari. However, at present \it no time- resolved near-IR spectroscopic results for IP's have ever been published. Building on our pilot near-IR observations of line variability from a newly-discovered IP, we will conduct a systematic radial-velocity study of a selection of bright, well-studied IP's, thus providing the first constraints on their nature from near-IR velocity- maps.


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



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