NOAO >   Observing Info >   Approved Programs >   2012A-0216

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Proposal Information for 2012A-0216


PI: Noel D. Richardson, Georgia State University, richardson@chara.gsu.edu
Address: Physics Department, P.O. Box 4106, Atlanta, GA 30302-4106, U.S.A.

CoI: Douglas Gies, Georgia State University
CoI: Ted Gull, NASA Goddard

Title: The Effects of Multiplicity on Luminous Blue Variables

Abstract: The massive O stars are known to love company, and more than 75% of O stars in clusters and associations have other companion stars in orbit around them. The most massive O stars evolve into Luminous Blue Variables (LBVs) that have attained a very bright and unstable stage in their lives. However, very few LBVs are thought to reside in binary systems, with only five known LBVs (or candidate LBVs) residing in binaries. The most famous example, \eta Carinae, has given insight to the crucial role the binary companion plays in the formation of dust and the enrichment of the ISM during this stage of evolution. In this long- term program, we will obtain new high resolution spectroscopy of known LBV binaries, as well as spectroscopy of LBV binary candidates from our previous long-term program. We will use advanced modeling techniques in order to understand the optical line variability present on the orbital time scales and to obtain accurate masses for these stars.


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 >   2012A-0216

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