Periodic Light Variability in Proto-Planetary Nebulae
Arts and Sciences
Physics and Astronomy
We are studying pulsational variability in proto-planetary nebulae (PPNe), an evolutionary stage of stars between the red giant and planetary nebula stages. Photometric observations of PPNe have been carried out over 10 years (2008-2018), primarily at the Valparaiso University Observatory, and supplemented by observations from the SARA consortium telescopes. Additionally, we have acquired data from the All-Sky Automated Survey (ASAS-SN), which has observations going back 4 years (2015-2018). This second dataset has lower precision, so those with the largest uncertainties have been removed. We are studying a sample of 18 stars. Using a Fourier analysis package called Period04, dominant periods have been searched for in both the VUO dataset and the ASAS-SN dataset. These periods will be compared with one another and ultimately for those with dominant periods with the general trends and ranges characteristic to these objects as seen in the literature.
Vogl, David M., "Periodic Light Variability in Proto-Planetary Nebulae" (2019). Summer Interdisciplinary Research Symposium. 62.