NOAO >   Observing Info >   Approved Programs >   2011A-0288

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Proposal Information for 2011A-0288


PI: Kenneth Hinkle, NOAO, hinkle@noao.edu
Address: NSSC, P.O. Box 26732, Tucson, AZ 85726, USA

CoI: Richard Joyce, NOAO
CoI: Thomas Lebzelter, Univ. of Vienna

Title: Imaging the debris cloud around the final flash star IRAS15154-5258

Abstract: A brief yet common evolutionary process is a post-AGB final episode of helium shell burning. This occurs after a low mass star has ejected a planetary nebula and has started on the white dwarf track. Seven stars are now classified with varying degrees of certainty as one of these ``final flash'' objects. Two of these have actually been observed to eject a shell of gas first as a pseudo-photosphere and then as a thick, expanding dust envelope. In 2010B we obtained Gemini NIRI/Altair time to take high spatial resolution images in the K band of the ejecta around five final flash objects. These AO images of the circumstellar shell will be used to measure changes from images recorded a decade or more ago. From these changes we will determine geometric parallaxes and hence luminosities. The luminosity will be compared to stellar evolution models. To complete this project we request time to take a first infrared image of the


National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360



NOAO >   Observing Info >   Approved Programs >   2011A-0288

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