Other
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21734210s&link_type=abstract
American Astronomical Society, AAS Meeting #217, #342.10; Bulletin of the American Astronomical Society, Vol. 43, 2011
Other
Scientific paper
In this project, we observed and analyzed the light and color variations of four proto-planetary nebulae (PPNe), IRAS 17436+5003, 18095+2704, 19386+0155, and 19475+3119. PPNe are a late stage in a star's evolution, after the asymptotic giant branch, when the star is in the process of losing its outer layers and exposing its core. Observations were carried out at the Valparaiso University Observatory, using the 0.4-meter telescope and CCD camera. This is a long-term study, incorporating 14 to 17 years of observations of these objects. Other data, published and from sky surveys, were combined in this comprehensive study. They each show a cyclical variation in brightness with variable amplitude, and they are each redder (cooler) when fainter. The derived periods are 47, 114, 101, and 39 days for IRAS 17436+5003, 18095+2704, 19386+0155, and 19475+3119, respectively. The bright source IRAS 17436+5003 (HD 161796) has a rich observation history and shows periods that range from 43 to 62 days. We acknowledge support for this research from the NSF and from the Indiana Space Grant Consortium.
Hrivnak Bruce J.
Lu Wei
Shaw Kristie
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