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Components of the open cluster system of the Galaxy from kinematic analysis

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The possibility of using open clusters as reference objects in kinematic analysis including the estimation of the distance to the Galactic centre is investigated. This analysis has produced distinctly different results for three components of the Galactic open cluster system: clusters of young, intermediate and old ages. We revealed that kinematic analysis of only young clusters (lgt < 8.1), although based on new data, cannot provide even a statistically reliable estimation of R0. Old remote clusters (lgt > 8.8) can stabilize the solution but they seem to have a significantly underestimated distance scale (formal estimates of R0 ˜ 6 ± 0.7Âkpc ).

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Keywords: Distance scale; Galactic centre distance; Galaxy; Kinematics; Open clusters; Structure

Document Type: Research Article

Affiliations: Sobolev Astronomical Institute of St Petersburg State University, Universitetskij Prospekt 28, Staryj Peterhof, St Petersburg, 198504, Russia

Publication date: 2006-04-01

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