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2004•Astronomy and AstrophysicsOpen access

uvby–H$_{\beta}$ CCD photometry of NGC 1817 and NGC 1807

L. Balaguer-Núñez, C. Jordi, D. Galadí-Enríquez, E. Masana

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Abstract

We have investigated the area of two NGC entries, NGC 1817 and NGC 1807, with deep CCD photometry in the uvby– intermediate-band system. The photometric analysis of a selected sample of stars of the open cluster NGC 1817 yields a reddening value of = , a distance modulus of = , a metallicity of [Fe/H] = and an age of = . Our measurements allow us to confirm that NGC 1807 is not a physical cluster.

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We have investigated the area of two NGC entries, NGC 1817 and NGC 1807, with deep CCD photometry in the uvby– intermediate-band system. The photometric analysis of a selected sample of stars of the open cluster NGC 1817 yields a reddening value of = , a distance modulus of = , a metallicity of [Fe/H] = and an age of = . Our measurements allow us to confirm that NGC 1807 is not a physical cluster.

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Available abstract

We have investigated the area of two NGC entries, NGC 1817 and NGC 1807, with deep CCD photometry in the uvby– intermediate-band system. The photometric analysis of a selected sample of stars of the open cluster NGC 1817 yields a reddening value of = , a distance modulus of = , a metallicity of [Fe/H] = and an age of = . Our measurements allow us to confirm that NGC 1807 is not a physical cluster.

Key concepts: Physics, Distance modulus, Photometry (optics), Astrophysics, Metallicity, Open cluster, Stars, Astronomy

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