A thorough analysis of the metal abundance gradient history in the Galactic disk by improving the statistics of well studied open clusters

Details A thorough analysis of the metal abundance gradient history in the Galactic disk by improving the statistics of well studied open clusters A thorough analysis of the metal abundance gradient history in the Galactic disk by improving the statistics of well studied open clusters

Feb 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008noao.prop....1c&link_type=abstract

NOAO Proposal ID #2008A-0001

Statistics

Scientific paper

Open clusters (OCs) have long been used as tracers of the evolution of the Galactic disk (GD). Although the number of studied OCs has recently increased significantly, nearly 60% of the ~ 1700 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 positions by comparing the abundance gradients corresponding to various groups of open clusters (OCs) of different ages and positions. The greater the number of OCs with well determined distances, ages and metallicities, 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 some selected OCs with the Washington system C and T_1 filters mainly to determine their basic parameters for the first time, with the aim of: (1) Improving the statistics of well-studied OCs. (2) Showing 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. We believe this is crucial in constraining the initial conditions and evolution of the gas and stars in the GD. (3) Shedding light on the controversial existence of an abundance gradient perpendicular to the Galactic plane and on the blurry age-metallicity relation (AMR).

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