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Planetary Nebulae, Morphology and Binarity, and the relevance to AGB Stars

Published online by Cambridge University Press:  30 December 2019

Raghvendra Sahai
Raghvendra Sahai*
Affiliation:
Jet Propulsion Laboratory MS 183-900, California Institue of Technology, Pasadena, CA 91109, USA email: raghvendra.sahai@jpl.nasa.gov
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Abstract

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The dramatic transformation of the spherical outflows of AGB stars into the extreme aspherical geometries seen during the planetary nebula (PN) phase is widely believed to be linked to binarity and is likely driven by the associated production of fast jets and central disks/torii. We first briefly summarize results from the imaging surveys of large samples of young PNe and pre-PNe with HST which show that almost all objects have bipolar, multipolar and elliptical morphologies, with widespread presence of point-symmetric structure. We describe a relatively new technique of using UV photometic observations of large AGB star samples to search for binarity and associated accretion activity, and follow-up studies using UV spectroscopy and X-ray observations. We present results from studies of individual objects in transition to the PN phase, highlighting observational techniques being used to determine jet properties that can constrain the accretion modes that power these jets.

Keywords

stars: AGB and post-AGBinstrumentation: High angular resolutionISM: planetary nebulae:general
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S343: Why Galaxies Care About AGB Stars: A Continuing Challenge through Cosmic Time , August 2018 , pp. 164 - 173
Copyright
© International Astronomical Union 2019 

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