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An analysis and classification of dying AGB stars transitioning to pre-planetary nebulae.

Show simple item record Blake, Adam C. 2012-07-12T19:41:48Z 2012-07-12T19:41:48Z 2011-05-02
dc.identifier.citation NASA USRP – Internship Final Report, Pasadena, California, May 2, 2011 en_US
dc.identifier.clearanceno 11-2483
dc.description.abstract The principal objective of the project is to understand part of the life and death process of a star. During the end of a star's life, it expels its mass at a very rapid rate. We want to understand how these Asymptotic Giant Branch (AGB) stars begin forming asymmetric structures as they start evolving towards the planetary nebula phase and why planetary nebulae show a very large variety of non-round geometrical shapes. To do this, we analyzed images of just-forming pre-planetary nebula from Hubble surveys. These images were run through various image correction processes like saturation correction and cosmic ray removal using in-house software to bring out the circumstellar structure. We classified the visible structure based on qualitative data such as lobe, waist, halo, and other structures. Radial and azimuthal intensity cuts were extracted from the images to quantitatively examine the circumstellar structure and measure departures from the smooth spherical outflow expected during most of the AGB mass-loss phase. By understanding the asymmetrical structure, we hope to understand the mechanisms that drive this stellar evolution. en_US
dc.description.sponsorship NASA/JPL en_US
dc.language.iso en_US en_US
dc.publisher Pasadena, CA : Jet Propulsion Laboratory, National Aeronautics and Space Administration, 2010. en_US
dc.subject stars en_US
dc.subject preplanetary nebulae en_US
dc.subject mass loss en_US
dc.subject astrophysical jets en_US
dc.title An analysis and classification of dying AGB stars transitioning to pre-planetary nebulae. en_US
dc.type Thesis en_US
dc.subject.NASATaxonomy Astronomy en_US

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