Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aas...20314801h&link_type=abstract
American Astronomical Society Meeting 203, #148.01; Bulletin of the American Astronomical Society, Vol. 36, p.593
Astronomy and Astrophysics
Astrophysics
Scientific paper
Proto-planetary nebulae are objects in transition between the AGB and planetary nebula phases of stellar evolution. As such, it is not surprising that they would pulsate. To investigate this, we have undertaken a study of the radial velocity and light variability of a sample of PPNs. Radial velocities were obtained with the 1.2-m telescope at the Dominion Astrophysical Observatory and photometric measurements were carried out with the 0.4-m telescope at the Valparaiso University Observatory over intervals of 4 and 10 years, respectively. Three of the objects displayed the same periods in both their velocity and light variabilities: IRAS 22223+4327 (P=89 d), IRAS 18095+2704 (P=110 d), and IRAS 22272+5435 (P=127 d). We will display and discuss these results. This work was supported by grants from the NSF (9900846) and the Indiana Space Grant Consortium.
Hrivnak Bruce J.
Lu Wei
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