Exploring Close Binary Stars in Planetary Nebulae Using the PHOEBE Modeling Software
Dr. Todd Hillwig
Arts and Sciences
Physics and Astronomy
We present the results of modeling the central binary star system within three planetary nebulae: Th 3-15, HaTr 4,and Hf 2-2. Brightness data of each binary star was obtained using a number of different telescopes, reduced, folded into a single orbital period for ease of visualization and analysis, and then imported into our modeling software PHOEBE. The software allows us to manipulate nine physical parameters to create a model of the system. These parameters are the temperatures, masses and radii of each star along with the inclination, secondary albedo and system radial velocity. Here we present the current results of our modeling along with a discussion of the impact of the results on our understanding of these systems. Further fine tuning of our binary models, when combined with spatio-kinematic models of the gaseous nebulae surrounding them, will provide an almost full picture of how these two distinct parts of the larger system are interacting and affecting one another over time. We expect to use these results in the future to further understand the relationship between the prominent shaping of planetary nebulae and the presence of a central binary star system.
Pavasars, Emily; Scheel, Lane; and Hillwig, Todd, "Exploring Close Binary Stars in Planetary Nebulae Using the PHOEBE Modeling Software" (2022). Summer Interdisciplinary Research Symposium. 136.