NOAO >   Observing Info >   Approved Programs >   2016A-0272

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Program Information for 2016A-0272


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

CoI: Richard A Shaw, NOAO
CoI: Letizia Stanghellini, NOAO

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

Abstract: We propose to obtain SOAR/Goodman spectra of 22 Galactic disk planetary nebulae (PNe) to derive their chemical abundances. This is an ongoing optical/IR spectral survey of 150 Galactic disk PNe to build a complete sample of their chemical abundances. The optical spectra will be combined with extit{Spitzer} spectra of IR fine-structure 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 of the ISM; and (3) to determine the Galactic radial metallicity gradient. 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. Our SOAR/Goodman observations in 2012-2015 semesters have yielded high quality spectra for 42 PNe and we will be able to complete observing the remaining bright southern objects with SOAR with this run.

Program Type: Standard/Galactic

Scheduled Nights:
Run 1 (2016A):  SOAR/Goodman -- 3n on Jun 10 - Jun 12 2016


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 >   2016A-0272

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