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

  • Andrés E. Piatti (a1), Juan J. Clariá (a2) and Andrea V. Ahumada (a2) (a3)

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.

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Copyright

References

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Bustos Fierro, I. H. 2007, PhD Thesis, Universidad Nacional de Córdoba, Argentina (BF07)
Dean, F. J., Warren, P. R., & Cousins, A. W. J. 1978, MNRAS, 183, 569
Houk, N. & Cowley, A. P. 1975, University of Michigan Catalogue of Two-Dimensional Spectral Types for the HD stars
Lejeune, T. & Schaerer, D. 2001, A&A, 366, 538
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Piatti, A. E., Clariá, J. J., & Ahumada, A. V. 2006 MNRAS, 367, 599
Straizys, V. 1992 Multicolor Stellar Photometry, Pachart Publishing House: Tucson, Arizona
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Keywords

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

  • Andrés E. Piatti (a1), Juan J. Clariá (a2) and Andrea V. Ahumada (a2) (a3)

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