NOAO >   Observing Info >   Approved Programs >   2014B-0240

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Proposal Information for 2014B-0240


PI: Joanna Mikolajewska, Polish Academy of Sciences, mikolaj@camk.edu.pl
Address: N. Copernicus Astronomical Center, Bartycka 18, Warsaw PL-00-716, Poland

CoI: Kenneth Hinkle, NOAO
CoI: Cezary Galan, N. Copernicus Astronomical Center

Title: Abundances and stellar evolution in long period binary systems

Abstract: Extrinsic C or S stars result from mass transfer in a binary system as one member of the system undergoes the TP-AGB phase. CNO processed material is mixed to the surface of the AGB star and transferred to a main-sequence companion. As the main-sequence star evolves it will become a giant with abundances not appropriate to the evolutionary state. Extrinsic C/S stars are known among many classes of binary systems containing a white dwarf but none are known among the symbiotic systems. Symbiotic systems are cool giant -- white dwarf binaries with orbital periods of years. We are undertaking a detailed abundance analysis to measure the CNO and s-process abundance patterns in symbiotic binaries. We expect to understand the role of metalicity in the evolution of the symbiotics and to use abundances to study the history of their binary evolution. Our work to date has been largely focused on the bulge population. We are proposing an extension of our survey to the northern disk and halo.


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-0240

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