In this research project, we observed and analyzed the light variability in a class of dying stars that are in the stage between Red Giant and White Dwarf in the evolution of stars like the Sun. Our observations were carried out during the summer and fall of 2012 at the Valparaiso Observatory. Thirty-two of these objects were observed in total. We analyzed a subset of 18 of these and found that they all varied in visual brightness by 10-70 percent. Periods for the variability were found for 8 out of 18 objects, and they range from 27 to 125 days, based on five years of observations. These variations are due to the pulsation of the stars. The goal is to find the amplitude and period of the variations; these can be used to investigate the internal structure of stars. This research was supported by a grant from the National Science Foundation.
Rotter, Hannah; Seider, Aaron; and Bain, Austin, "A Study of Light Variability in Dying Stars" (2013). Symposium on Undergraduate Research and Creative Expression (SOURCE). 276.