NOAO >   Observing Info >   Approved Programs >   2012B-0194

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Proposal Information for 2012B-0194


PI: Noel D Richardson, Georgia State University, richardson@chara.gsu.edu
Address: Physics Department, 28 Peachtree Center, Atlanta, Georgia 30303, United States

CoI: Douglas Gies, Georgia State University
CoI: Ted Gull, NASA Goddard
CoI: Anthony F. J. Moffat, Universite de Montreal

Title: Interactions in the LBV binaries \eta Carinae and HD 5980

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. Most O stars will 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, and only five LBVs (or candidate LBVs) are known 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 program, we will obtain new high resolution spectroscopy of two known LBV binaries. \eta Carinae will be examined for the current expected changes in the system, while HD 5980 will be examined with methods to disentangle the component spectra and obtain accurate masses for the WR star and LBV component.


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 >   2012B-0194

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