Light and Velocity Variability in Seven Bright Proto-Planetary Nebulae

Details Light and Velocity Variability in Seven Bright Proto-Planetary Nebulae Light and Velocity Variability in Seven Bright Proto-Planetary Nebulae

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21349111m&link_type=abstract

American Astronomical Society, AAS Meeting #213, #491.11; Bulletin of the American Astronomical Society, Vol. 41, p.468

Astronomy and Astrophysics

Astrophysics

Scientific paper

Light and Velocity Variability in Seven Bright Proto-Planetary Nebulae
R.B. McGuire, C.M. Steele, B.J. Hrivnak, W. Lu, D. Bohlender, C.D. Scarfe
We present new contemporaneous light and velocity observations of seven proto-planetary nebulae obtained over the past two years. Proto-planetary nebulae are objects evolving between the AGB and planetary nebula phases. In these seven objects, the central star is bright (V= 7-10), surrounded by a faint nebula. We knew from past monitoring that the light from each of these varied by a few tenths of a magnitude over intervals of 30-150 days and that the velocity varied by 10 km/s. These appear to be due to pulsation. With these new contemporaneous observations, we are able to measure the correlation between the brightness, color, and velocity, which will constrain the pulsation models. This is an ongoing project with the light monitoring being carried out with the Valparaiso University 0.4 m telescope and CCD camera and the radial velocity observations being carried out with the Dominion Astrophysical Observatory 1.8 m telescope and spectrograph. This research is partially supported by NSF grant 0407087 and the Indiana Space Grant Consortium.

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