Department of Astronomy & Physics
Dr. Chris Geroux, Ph.D.
Congratulations to Dr. Chris Geroux who successfully defended his Ph. D. thesis entitled “The Interaction Between Multi-Dimensional Convection and Radial Stellar Pulsation” on Thursday, January 31. His research was supervised by Dr. Robert Deupree and the external examiner was Dr. Robert Stellingwerf of Stellingwerf Consulting. The other thesis defense committee members were Drs. Luigi Gallo and Ian Short. Chris’ research focused on 1D, 2D, and 3D hydrodynamic simulations of radially pulsating RR Lyrae variables with the objective of computing full amplitude solutions for comparison with observed light curves. Convection, which is believed to limit the pulsational amplitude near the red edge of the RR Lyrae gap, arises naturally in the 2D and 3D calculations without recourse to a phenomenological approach such as the local mixing length theory. A particularly interesting result is that Chris’ light curve for a model near the red edge resembles that of an observed star significantly more closely than do light curves computed with 1D mixing length treatments. Chris is now working as a postdoctoral fellow with Dr. Isabelle Baraffe at the University of Exeter.