000004772 001__ 4772
000004772 005__ 20200206105442.0
000004772 037__ $$aPOSTER-2020-0059
000004772 100__ $$aHrivnak, Bruce;  
000004772 245__ $$aVariability in Post-AGB Stars: Pulsation in Proto-Planetary Nebulae
000004772 260__ $$c2019
000004772 269__ $$c2019-12-01
000004772 520__ $$aWe have been intensely monitoring photometric variability in proto-planetary nebulae (PPNe) over the past 25 years and radial velocity variability over the past ten years. Pulsational variability has been obvious, in both the light and velocity, although the resulting curves are complex, with multiple periods and varying amplitudes. Observed periods range from 25 to 160 days, and the periods and amplitudes reveal evolutionary trends. We will present our observational results to date for approximately 30 PPNe, and discuss these results, including the search for period changes that might help constrain post-AGB evolutionary timescales.
000004772 594__ $$aNO
000004772 6531_ $$aAGB and post-AGB; 
000004772 6531_ $$astars: variable
000004772 700__ $$aHenson, Gary;  
000004772 700__ $$aVan de Steene, Griet;  
000004772 700__ $$aVan Winckel, Hans; 
000004772 700__ $$aHillwig, Todd;  
000004772 700__ $$aBremer, Matthew
000004772 773__ $$t2019IAUS,343,423
000004772 8560_ $$fgriet.vandesteene@observatoire.be
000004772 85642 $$ahttps://ui.adsabs.harvard.edu/abs/2019IAUS..343..423H/abstract
000004772 980__ $$aCPOSTER