NOAO >   Observing Info >   Approved Programs >   2008B-0418

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Proposal Information for 2008B-0418


PI: Todd Hillwig, Valparaiso University, todd.hillwig@valpo.edu
Address: Dept. of Physics & Astronomy, Neils Science Center, Valparaiso, IN 46383, United States

CoI: Orsola De Marco, American Museum of Natural History
CoI: David Frew, Perth Observatory

Title: Determining the System Parameters for Poorly Studied Binary Central Stars of Planetary Nebulae

Abstract: Current estimates of the impact of close binary stars on the shaping and ejection of planetary nebulae include a number of systems for which no published data exists other than discovery notations and orbital periods. Six of the currently catalogued sixteen binary systems are poorly studied. With the current emphasis in planetary nebula research on determining the role of binarity in the planetary nebula process, it is imperative that we understand as well as possible the small number of detected binary systems. We propose here to obtain photometry that will allow us to model the six poorly studied systems. The required photometric observations span two semesters, therefore we are requesting long-term status for this program. In addition to binary modeling, we will also use the results of the photometry to propose follow-up spectroscopic observations in a future semester. The spectroscopy combined with photometry requested here will allow accurate binary modeling of the systems.


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