Exploiting kinematics and UBVIc photometry to establish high fidelity membership of the open cluster Blanco 1

Cargile, P. A. ; James, D. J. ; Platais, I. ; Mermilliod, J.-C ; Deliyannis, C. ; Steinhauer, A.

In: Proceedings of the International Astronomical Union, 2007, vol. 3, no. S248, p. 490-491

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    Summary
    We present the results of a wide-field, high-precision UBVIc CCD photometric survey of the Galactic open cluster Blanco 1. Standardized photometry was acquired using the Y4Kcam on the SMARTS 1m telescope at CTIO. We have also determined new high-precision proper motions (σμ = 0.3 mas yr−1) over an eight square degree area down to V = 16.5. Combined with 1D kinematic data, our survey yields a complete list of cluster members down to ~ 0.5 M and new high-fidelity color-magnitude diagrams are presented for Blanco 1. Having established a bona fide membership catalog, astrophysical characteristics of solar-type cluster members such as X-ray activity and lithium abundance have been studied to gain more insights in the process of internal mixing and convection. Our new results should also help to better understand its peculiar location in the Milky Way and to unravel its dynamical history