Light Variation and Period Studies of Southern Proto-Planetary Nebulae

Primary Submission Contact

Jacob Bowman

Faculty Sponsor

Bruce Hrivnak

Faculty Sponsor Email Address



Arts and Sciences


Physics and Astronomy

Document Type

Poster Presentation


Fall 9-12-2014


Stars go through many stages in their evolution. Proto-Planetary nebulae (PPN) are the recently discovered phase between the Red Giant and Planetary Nebula stages. PPN have been known to change in brightness and size. Brightness measurements were made on 25 PPN at the Valparaiso University (VU) Observatory this summer. Our observations will be combined with previous observations to search for periodicity. Knowing the periods of pulsation will be useful in determining the internal structure of PPN. Several of the observed PPN have shown to fluctuate with a cyclical period. In addition to continuing observations for this long-term project at the VU Observatory, we have observations from the SARA-South telescope in Chile for 9 new proto-planetary nebula candidates. These objects have only been observed for 1 to 4 years each and the data sets are small. They were searched for periodicity and preliminary values were found. Three of the 9 objects appear to have periods that will be investigated with further observations. This research is supported by the National Science Foundation (NSF) MSEED grant No. 1068346 to VU and by an NSF grant (AST 1009974) to Prof. Bruce Hrivnak.

Additional Presentation Information

Wall Poster

This document is currently not available here.