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Variability of Planetary Nebula Central Stars For the past decade, we have been searching for short timescale variability in the central stars of Galactic planetary nebulae (PNN). By using CCDs to simultaneously measure the PNN and several comparison stars, and by applying image analysis techniques to suppress or remove the background, we have been able to derive relative magnitudes for the ...
www.astro.psu.edu/users/rbc/res_puls.html
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