NOAO >   Observing Info >   Approved Programs >   2005B-0157

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Proposal Information for 2005B-0157


PI: Styliani Kafka, Indiana Univ, skafka@astro.indiana.edu
Address: Astronomy Department, 319 Swain Hall West, Bloomington, Indiana 47408, USA

CoI: R. Kent Honeycutt, Indiana University, Astronomy Drpt

Title: Outflows in CVs: Investigating an Alternative Mechanism for Angular Momentum Loss

Abstract: Cataclysmic variables (CVs) often have evidence for bi-polar winds arising from the accretion process, which 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, several CVs are now known to 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 means of distinguishing wind and disk components; however we know very little about the time/orbital behavior of the winds or the types of CVs in which winds occur. This proposal is to conduct a modest spectroscopic survey of CVs, searching 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 can provide enough angular momentum loss to affect CV evolution.


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