Periodic Light Variability in Twelve Carbon-rich Proto-Planetary Nebulae

Details Periodic Light Variability in Twelve Carbon-rich Proto-Planetary Nebulae Periodic Light Variability in Twelve Carbon-rich Proto-Planetary Nebulae

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21349110h&link_type=abstract

American Astronomical Society, AAS Meeting #213, #491.10; Bulletin of the American Astronomical Society, Vol. 41, p.468

Astronomy and Astrophysics

Astronomy

Scientific paper

We present the results of a long-term (14 year) photometric monitoring program of 12 carbon-rich proto-planetary nebulae (PPNs). PPNs are objects in the evolutionary transition between the AGB and planetary nebula phases. These 12 have bright central stars (V=8-14 mag) with F-G spectral types and faint nebulae (as seen with HST). Most of the objects show a periodicity in their light variations, although there is evidence for small period changes or secondary periods. The periods range from 35 to 153 days, with the longer periods correlated with later spectral types. The observations were all made at the Valparaiso University Observatory, with the 0.4 m telescope and CCD. This research is partially supported by NSF grant 0407087, the NASA JOVE program, and the Indiana Space Grant Consortium.

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