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NGC 2587: a sparse open cluster projected onto a populous star field

Published online by Cambridge University Press:  18 January 2010

Andrés E. Piatti
Affiliation:
Instituto de Astronomía y Física del Espacio, Casilla 67, Suc. 28, 1428 Buenos Aires, Argentina email: andres@iafe.uba.ar
Juan J. Clariá
Affiliation:
Observatorio Astronómico de Córdoba, Laprida 854, 5000 Córdoba, Argentina email: claria@oac.uncor.edu
Andrea V. Ahumada
Affiliation:
Observatorio Astronómico de Córdoba, Laprida 854, 5000 Córdoba, Argentina email: claria@oac.uncor.edu European Southern Observatory, Alonso de Córdova 3107, Santiago, Chile email: aahumada@eso.org
Corresponding
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Abstract

We present CCD BVIKC photometry in the field of the open cluster NGC 2587. We developed a new method to clean statistically the colour–magnitude diagrams. NGC 2587 is found to be slightly younger than the Hyades and probably of solar metallicity. From 18 probable members with measured proper motions, we derived the following mean cluster values: μα = −4.3 ± 3.6 mas yr−1 and μδ = −2.5 ± 3.4 mas yr−1. Colour excesses, E(BV) = 0.10 and E(VI) = 0.15 mag, and a heliocentric distance of 3.7 ± 0.7 kpc are obtained. The interstellar extinction in the cluster direction is found to follow the normal reddening law.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2010

References

Bustos Fierro, I. H. 2007, PhD Thesis, Universidad Nacional de Córdoba, Argentina (BF07)Google Scholar
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Houk, N. & Cowley, A. P. 1975, University of Michigan Catalogue of Two-Dimensional Spectral Types for the HD starsGoogle Scholar
Lejeune, T. & Schaerer, D. 2001, A&A, 366, 538Google Scholar
Palma, T., Ahumada, A. V., Clariá, J. J., & Bica, E. 2008 AN, 329, 392Google Scholar
Piatti, A. E., Clariá, J. J., & Ahumada, A. V. 2006 MNRAS, 367, 599CrossRefGoogle Scholar
Straizys, V. 1992 Multicolor Stellar Photometry, Pachart Publishing House: Tucson, ArizonaGoogle Scholar

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