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

Published online by Cambridge University Press:  01 October 2007

P. A. Cargile ,
D. J. James ,
I. Platais ,
J.-C. Mermilliod ,
C. Deliyannis  and
A. Steinhauer
P. A. Cargile
Affiliation:
Department of Physics and Astronomy, Vanderbilt UniversityNashville, TN 37235, USA email: p.cargile@vanderbilt.edu
D. J. James
Affiliation:
Department of Physics and Astronomy, Vanderbilt UniversityNashville, TN 37235, USA email: p.cargile@vanderbilt.edu
I. Platais
Affiliation:
Johns-Hopkins University, Baltimore, MD, USA
J.-C. Mermilliod
Affiliation:
EPFL Lausanne, Lausanne, Switzerland
C. Deliyannis
Affiliation:
Universtiy of Indiana, Bloomington, IN, USA
A. Steinhauer
Affiliation:
SUNY-Geneseo, Geneseo, NY, USA
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Abstract

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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.

Keywords

astrometrytechniques: photometricopen clusters and associations: individual (Blanco 1)
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S248: A Giant Step: from Milli- to Micro-arcsecond Astrometry , October 2007 , pp. 490 - 491
Copyright
Copyright © International Astronomical Union 2008

References

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Platais, I., et al. 2007, A&A, 461, 509Google Scholar
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