Pulsational Light and Velocity Variability in Post-AGB Stars (Proto-Planetary Nebulae)

Details Pulsational Light and Velocity Variability in Post-AGB Stars (Proto-Planetary Nebulae) Pulsational Light and Velocity Variability in Post-AGB Stars (Proto-Planetary Nebulae)

Sep 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aipc.1170..597h&link_type=abstract

STELLAR PULSATION: CHALLENGES FOR THEORY AND OBSERVATION: Proceedings of the International Conference. AIP Conference Proceedin

Computer Science

2

Giant And Subgiant Stars, Photometric, Polarimetric, And Spectroscopic Instrumentation, Pulsations, Oscillations, And Stellar Seismology

Scientific paper

We present the results of a long-term (15 year) photometric monitoring program of 30 post-AGB stars. They are classified as proto-planetary nebulae (PPNs), objects in the evolutionary transition between the AGB and planetary nebula phases. They all show variability, and periods have been determined for most of these. However, the variability is not strictly periodic or at least not with a single period. We highlight a sample of 12 carbon-rich objects, all with bright central stars (V = 8-14 mag) of F-G spectral types. The pulsational periods range from 35 to 153 days, with the longer periods associated with later spectral types. Seven of the brightest PPNs have also been monitored for radial velocity variations and show periods similar to the photometric ones and peak-to-peak variations of 10 km s-1. Contemporaneous light and velocity curves for one good case show the star to be hottest and smallest when it is brightest. These observations are continuing and will provide good comparisons for pulsational models for post-AGB stars and allow us to determine the masses and luminosities for these objects.

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