CfA OIR Division Lunch Talks
Wednesday, June 26, 2013, 11:00 am, Pratt Conference Room

R Coronae Borealis Stars: A Tale of Two (Origin) Theories

Edward Montiel (Louisiana State University)

I will discuss the subject of my ongoing thesis work: R Coronae Borealis (RCB) stars -- an enigmatic class of post-AGB stars and rare example of stellar evolution. After an introduction of their properties, I will highlight the strengths and weaknesses of the two leading theories for the formation of RCB stars, the double degenerate (DD) and final helium-shell flash (FF) models. Finally, I will connect these theories to my recent work involving the RCB star UW Cen, which is the only known RCB star with a visible reflection nebula surrounding it, and what we can learn about its progenitor by studying the relationship between the central star and the circumstellar material.