NOAO >   Observing Info >   Approved Programs >   2010B-0399

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Proposal Information for 2010B-0399


PI: Eric Joseph Bubar, University of Rochester, ebubar@pas.rochester.edu
Address: Physics Department, 477 Bausch and Lomb Hall, 500 Wilson Boulevard, Rochester, NY 14620, USA

CoI: Mark Pecaut, University of Rochester
CoI: Eric Mamajek, University of Rochester

Title: Chemically Tagging Kinematic Structure in the Solar Neighborhood

Abstract: The concept of kinematic assemblages representing dissolved clusters has remained contentious since Eggen's formulation of moving groups [Eggen58]. The availability of precise astrometric data from Hipparcos has led to evidence that the large scale kinematic structure of the solar neighborhood is dominated by \emphdynamical streams composed of stars of various ages and metallicities[Famaey05], rather than the relic cluster/supercluster picture of Eggen. In order to address this dissolved cluster versus dynamic structure paradigm, we have flagged solar-type (F,G, and K) members of two kinematic groups. In order to unravel their origin, we propose to obtain high resolution stellar spectroscopy of the alleged group members. \textbfBy applying the novel approach of chemically tagging the members across multiple elemental abundances, we will ascertain whether the kinematic structures plausibly represent a dissolved cluster or are dynamically formed entities. The results of this work will build a foundation for further use of kine-chemical tagging in exploring both the dynamical and chemical evolution of the Galactic disk.


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NOAO >   Observing Info >   Approved Programs >   2010B-0399

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