NOAO >   Observing Info >   Approved Programs >   2011A-0114

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Proposal Information for 2011A-0114


PI: Juan J. Claria, Cordoba's Observatory (OAC), claria@oac.uncor.edu
Address: Stellar Astrophysics, Laprida 854, Cordoba, Cordoba 5000, Argentina

CoI: Andres Piatti, IAFE, Bs.As.
CoI: Andrea V. Ahumada, OAC, ESO-Chile
CoI: M. Celeste Parisi, OAC
CoI: Tali Palma, OAC

Title: Astrophysical parameters of unstudied or poorly studied galactic open clusters: towards a thorough understanding of the formation and evolution of the galactic disk

Abstract: Open clusters (OCs) have long been used as tracers of the formation and evolution of the Galactic disk (GD). Although the number of studied OCs has recently increased significantly, nearly 50% of the ~ 1800 Galactic OCs known to exist are still unstudied objects. We want to examine how the abundance gradient in the GD evolved in time and along different Galactic longitudes by comparing the abundance gradients corresponding to various groups of OCs of different ages and positions. The greater the number of OCs with well determined parameters, the more precise and detailed the analysis of the metal abundance gradient in the GD as well as its evolution over time. We then propose to observe with the UBVI filters some selected OCs, previously observed by us in the the Washington system, mainly to determine their basic parameters for the first time. Metallicities will be derived from our Washington photometric data as well as from spectra of selected red giants to be obtained with the 2.15 telescope at CASLEO (Argentina). Our main goals are: (1) to improve the statistics of well-studied OCs. (2) to show how the radial abundance gradient has evolved in course of time and along different Galactic longitudes by dividing the whole sample of known OCs into age-position groups.


National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360



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