NOAO >   Observing Info >   Approved Programs >   2017A-0168

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Program Information for 2017A-0168


PI: Todd Hillwig, Valparaiso U., Todd.Hillwig@valpo.edu
Address: Dept. of Physics & Astronomy, Valparaiso University, Valparaiso, IN, 46383 USA

CoI: David Jones, Instituto de Astrofisica de Canarias
CoI: Nicole Reindl, University of Leicester

Title: Exploring Possible post-RGB Central Stars of Planetary Nebulae

Abstract: It is unclear whether a binary system that enters a common envelope phase when one star enters the red giant branch can produce a visible planetary nebula. Most evolutionary models predict that the central star will heat up too slowly to ionize the ejected envelope before it disperses. However, some work suggest that it may be possible, and even likely. We have discovered two close binary systems in planetary nebulae for which binary modeling from photometry suggests the hot stars may be post-RGB objects. We request orbit-resolved spectroscopy to confirm whether this is the case.

Program Type: Standard/Galactic

Scheduled Nights:
Run 1 (2017A):  GEM-SQ/GMOSS -- 21.7hrs band 3 (GS-2017A-Q-78)


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NOAO >   Observing Info >   Approved Programs >   2017A-0168

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