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B.J. Hrivnak, W. Lu (Valparaiso University)
Proto-planetary nebulae are objects in transition between the AGB and planetary nebula phases of stellar evolution. As such, it is not surprising that they would pulsate. To investigate this, we have undertaken a study of the radial velocity and light variability of a sample of PPNs. Radial velocities were obtained with the 1.2-m telescope at the Dominion Astrophysical Observatory and photometric measurements were carried out with the 0.4-m telescope at the Valparaiso University Observatory over intervals of 4 and 9 years, respectively. Three of the objects displayed the same periods in both their velocity and light variabilities: IRAS 22223+4327 (P=89 d), IRAS 18095+2704 (P=110 d), and IRAS 22272+5435 (p+127 d). We will display and discuss these results. This work was supported by grants from the NSF (9900846) and the Indiana Space Grant Consortium.
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Bulletin of the American Astronomical Society, 35 #3
© 2003. The American Astronomical Soceity.