NOAO >   Observing Info >   Approved Programs >   2017A-0285

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Program Information for 2017A-0285


PI: Kenneth H Hinkle, NOAO, hinkle@noao.edu
Address: PO Box 26732, 950 NORTH CHERRY AVENUE, TUCSON, AZ 85726-6732 USA

CoI: Cezary Galan, N. Copernicus Astronomical Center
CoI: Joanna Mikolajewska, N. Copernicus Astronomical Center
CoI: Thomas Lebzelter, Universitat Wien (University of Vienna)
CoI: Francis C Fekel, Tennessee State U.
CoI: Dick Joyce, NOAO

Title: Isotopic abundances and binary star evolution

Abstract: Symbiotic binary systems are one member of a class of long-period binary systems with a red giant primary and a stellar remnant, typically white dwarf, secondary. In other classes of these binaries the late-type giant star has 'extrinsic' abundances as a result of mass transfer that occurred when the white dwarf was an AGB star. While astrophysics can now account for details of individual star evolution much less is known about binary star evolution. We have been working for some time to understand the origin of the 'normal' abundances of S-type symbiotic giants. We propose here to measure carbon and oxygen isotopic ratios. These will allow us to measure the interior mixing, the initial mass, and the initial oxygen abundance. Combined with known orbital elements, CNO abundances, and Fe-group abundances we will establish bounds on the mass transferred to the current red giant from the AGB precursor to the current white dwarf.

Program Type: Standard/Galactic

Scheduled Nights:
Run 1 (2017A):  GEM-S-SVC/PHNX -- 10hrs band 3 (GS-2017A-Q-77)


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 >   2017A-0285

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