Title

Periodic Light Variability in Proto-Planetary Nebulae

Faculty Sponsor

Bruce Hrivnak

College

Arts and Sciences

Department/Program

Physics and Astronomy

Document Type

Poster Presentation

Symposium Date

Summer 7-29-2019

Abstract

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.

This document is currently not available here.

Share

COinS