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- W2034322537 abstract "The Hipparcos data allow a major step forward in the research of `moving groups' in the Solar neighbourhood, as the common motion of group members causes converging proper motions. Previous knowledge on these coherent structures in velocity space has always been limited by the availability, reliability, and accuracy of ground-based proper motion measurements. A refurbishment of Jones' convergent point method is presented which takes full advantage of the quality of the Hipparcos data. The original implementation of this method determines the maximum likelihood convergent point on a grid on the sky and simultaneously selects group members from a given set of stars with positions and proper motions. The refurbished procedure takes into account the full covariance matrix of the Hipparcos measurements instead of standard errors only, allows for internal motions of the stars, and replaces the grid-based approach by a direct minimization. The method is tested on Monte Carlo simulations of moving groups, and applied to the Hyades. Despite the limited amount of data used by the convergent point method, the results for stars in and around the cluster- centre region agree very well with those of the recent comprehensive study by Perryman et al. (1998)." @default.
- W2034322537 created "2016-06-24" @default.
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- W2034322537 date "1999-06-21" @default.
- W2034322537 modified "2023-10-16" @default.
- W2034322537 title "A refurbished convergent-point method for finding moving groups in the<i>Hipparcos</i>Catalogue<sup>*</sup>" @default.
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- W2034322537 doi "https://doi.org/10.1046/j.1365-8711.1999.02643.x" @default.
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