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uvby-Hβ CCD photometry of NGC 1817 and NGC 1807
We have investigated the area of two NGC entries, NGC 1817 and NGC 1807,with deep CCD photometry in the uvby-Hβintermediate-band system. The photometric analysis of a selected sampleof stars of the open cluster NGC 1817 yields a reddening value of E(b-y)= 0.19±0.05, a distance modulus of V0-MV =10.9±0.6, a metallicity of [Fe/H] = -0.34±0.26 and an ageof log t = 9.05±0.05. Our measurements allow us to confirm thatNGC 1807 is not a physical cluster.Figure \ref{map} and Tables \ref{log} and \ref{chips} are only availablein electronic form at http://www.edpsciences.orgTables 4 and 5 are only available in electronic form at the CDS viaanonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or viahttp://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/426/827
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| Takýmyýldýz: | Boga |
| Sað Açýklýk: | 05h09m57.91s |
| Yükselim: | +16°16'31.5" |
| Görünürdeki Parlaklýk: | 9.814 |
| özdevim Sað Açýklýk: | -3.3 |
| özdevim Yükselim: | -12.8 |
| B-T magnitude: | 9.927 |
| V-T magnitude: | 9.824 |
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