Planetary Nebulae and Post-AGB Stars
The Post-AGB phase of stellar evolution is probably the least understood phase of stellar evolution. Even in the age of Gaia, the distances to most Milky Way PNe have extraordinary large uncertainties, and the identification of naked PAGB stars is difficult. Yet if properly used, these objects can be extremely precise standard candles and yield unique insights into the chemical evolution of the Milky Way and of nearby galaxies.
Publications
Davis, B.D., Bond, H.E., Siegel, M.H., & Ciardullo, R. 2022, "A Census of Above-horizontal-branch Stars in Galactic Globular Clusters," Ap. J., 926, 99 [ADS Entry]
Bond, H.E., Davis, B.D., Siegel, M.H., & Ciardullo, R., 2021, "Two Luminous Post-AGB Stars in the Galactic Globular Cluster M19", A. J., 161, 125 [ADS Entry]
Davis, B.D., Bond, H.E., Ciardullo, R., & Jacoby, G.H. 2019, "Hubble Space Telescope Spectroscopy of a Planetary Nebula in an M31 Open Cluster: Hot-bottom Burning at 3.4 Solar Masses," Ap. J. 884, 115 [ADS Entry]
Bond, H.E., Ciardullo, R., Esplin, T.L., Hawley, S.A., Liebert, J., & Munari, U. 2016, "The Nucleus of the Planetary Nebula EGB 6 as a Post-Mira Binary," Ap. J, 826, 139 [ADS Entry]
Bond, H.E., Ciardullo, R., & Siegel, M.H. 2016, "A Luminous Yellow Post-AGB Star in the Galactic Globular Cluster M79," A.J., 151, 40 [ADS Entry]
Badenes, C., Maoz, D., & Ciardullo, R. 2015, "The Progenitors and Lifetimes of Planetary Nebulae," Ap. J. (Letters), 804, L25 [ADS Entry]
Liebert, J., Bond, H.E., Dufour, P., Ciardullo, R., Meakes, M.G., Renzini, A., & Gianninas, A. 2013, "Hubble Space Telescope Imaging of the Binary Nucleus of the Planetary Nebula EGB 6," Ap. J., 769, 32 [ADS Entry]
Jacoby, G.H., Ciardullo, R., De Marco, O., Lee, M.G., Herrmann, K.A., Hwang, H.S., Kaplan, E., & Davies, J.E. 2013, "A Survey for Planetary Nebulae in M31 Globular Clusters," Ap. J., 769, 10 [ADS Entry]
Benedict, G.F., McArthur, B.E., Napiwotzki, R., Harrison, T.E., Harris, H.C., Nelan, E., Bond, H.E., Patterson, R.J., & Ciardullo, R. 2009, "Astrometry with the Hubble Space Telescope: Trigonometric Parallaxes of Planetary Nebula Nuclei NGC 6853, NGC 7293, Abell 31, and DeHt 5," A. J., 138, 1969 [ADS Entry]
Ciardullo, R., Bond, H.E., Sipior, M.S., Fullton, L.K., Zhang, C.-Y., & Schaefer, K.G. 1999, "A Hubble Space Telescope Survey for Resolved Companions of Planetary Nebula Nuclei," A. J., 118, 488 [ADS Entry]
Bond, H.E., & Ciardullo, R. 1999, "Distance to the Planetary Nebula NGC 246 from the Resolved Companion of Its Central Star," Pub. A.S.P., 756, 217 [ADS Entry]
Ciardullo, R., & Bond, H.E. 1996, "A Survey for Pulsations in O VI Nuclei of Planetary Nebulae," A. J., 111, 2332 [ADS Entry]
Bond, H.E., Ciardullo, R., & Meakes, M.G. 1992, "Close-Binary Nuclei of Planetary Nebulae," in I.A.U. Symposium 151, Evolutionary Processes in Interacting Binary Stars, ed. Y. Kondo et al. (Dordrecht: Reidel), p. 517 [ADS Entry]
Bond, H.E., Kawaler, S.D., Ciardullo, R., Stover, R., Kuroda, T., Ishida, T., Ono, T., Tamura, S., Malasan, H., Yamasaki, A., Hashimoto, O., Kambe, E., Takeuti, M., Kato, T., Kato, M., Chen, J.-S., Leibowitz, E.M., Roth, M.M.., Soffner, T., & Mitsch, W. 1996, "Asteroseismological Observations of the Central Star of the Planetary Nebulae NGC 1501," A. J., 112, 2699 [ADS Entry]
Handler, G., Mendez, R.H., Medupe, R., Costero, R., Birch, P.V., Alvarez, M., Sullivan, D.J., Kurtz, D.W., Herrero, A., Guerrero, M.A., Ciardullo, R., & Breger, M. 1997, "Variable Central Stars of Young Planetary Nebulae I. Photometric Multisite Observations of IC 418," Astr. Ap., 320, 125 [ADS Entry]
Bond, H.E., Ciardullo, R., & Kawaler, S.D. 1993, "Asteroseismology of Planetary Nebula Nuclei," Acta Astr., 43, 425 [ADS Entry]
Wood, J.H., Marsh, T.R., Robinson, E.L., Stiening, R.F., Horne, K., Stover, R.J., Schoembs, R., Allen, S.L., Bond, H.E., Jones, D.H.P., Grauer, A.D., & Ciardullo, R. 1989, "The Ephemeris and Variations of the Accretion Disc Radius in IP Pegasi," M.N.R.A.S., 239, 809 [ADS Entry]