NOAO >   Observing Info >   Approved Programs >   2014B-0129

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Proposal Information for 2014B-0129


PI: Ting-Hui Lee, Western Kentucky University, ting-hui.lee@wku.edu
Address: Physics Department, 1906 College Heights Blvd, Bowling Green, KY 42101, USA

CoI: Richard A. Shaw, National Optical Astronomy Observatory
CoI: Letizia Stanghellini, National Optical Astronomy Observatory

Title: Chemical Abundances of Compact Planetary Nebulae in the Galactic Disk

Abstract: We propose to obtain SOAR/Goodman spectra of 20 Galactic disk planetary nebulae (PNe) to derive their elemental abundances. This is an ongoing optical/IR spectral survey of 150 compact PNe to build a complete sample of their chemical abundances in the Galactic disk. Our SOAR/Goodman observations in the 2012B and 2013A semesters have yielded high quality spectra for 27 PNe; we plan to observe an additional 20 southern-sky objects in 2014B. The optical spectra will be combined with \textitSpitzer spectra of IR collisional lines to improve abundance constraints. Our main objectives are: (1) to constrain stellar evolution models, particularly the metallicity-dependent onset of hot-bottom burning; (2) to quantify the contribution of low- to intermediate-mass stars to chemical enrichment; and (3) to improve the ionization correction factors for Ne, O, S, and Ar that we have observed in the IR. We will also compare these findings to our optical+IR Magellanic Cloud PN abundances to better understand the influence of progenitor metallicity on stellar chemical yields.


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 >   2014B-0129

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