NOAO >   Observing Info >   Approved Programs >   2008A-0145

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Proposal Information for 2008A-0145


PI: Stella Kafka, Spitzer Science Center/Caltech, stella@caltech.edu
Address: MS 220-6, 1200 E.California Blvd., Pasadena, CA 91125, USA

CoI: R. Kent Honeycutt, Indiana University
CoI: Don Hoard, Spitzer Science Center / Caltech

Title: Sneezes, gasps and yawns in the evolution of Cataclsmic Variables: a spectroscopic study of winds

Abstract: Cataclysmic variables (CVs) sometimes show evidence for bi-polar winds arising from the accretion process. These winds carry away mass and angular momentum, likely affecting the evolution of the system. For the most part, it has only been possible to study such winds by means of the P Cygni profiles seen in space-UV resonance lines. However, we have found that a number of CVs show wind lines in the optical region of the spectrum, providing the opportunity for ground-based study of changes in the wind to determine its origin, time scales, kinematics, and geometry. Distinct differences in the behaviors of singlet and triplet He I lines provide a means to distinguish wind and disk components; however we know very little about the secular and orbital changes in the winds, or the types of CVs in which winds occur. This proposal is to enrich our on- going spectroscopic program studying for P Cygni profiles in the He I triplet lines. These data will reveal the kinds of CVs that have winds and how often winds appear, information critical to understanding if such winds contribute to the angular momentum loss that drives CV evolution.


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 >   2008A-0145

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