A uvbycaHΒ CCD Survey Of The Intermediate-age Open Cluster, NGC 7789

Details A uvbycaHΒ CCD Survey Of The Intermediate-age Open Cluster, NGC 7789 A uvbycaHΒ CCD Survey Of The Intermediate-age Open Cluster, NGC 7789

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21943809t&link_type=abstract

American Astronomical Society, AAS Meeting #219, #438.09

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The 1.4 Gyr-old open cluster, NGC 7789, has been surveyed and analyzed using CCD photometry on the extended Stromgren system. Using a preliminary calibration of the intermediate-band indices, 122 highly probable F-dwarf single-star members from the core of the cluster produce E(b-y) = 0.214 ± 0.010 (zero-point uncertainty included) or E(B-V) = 0.293 ± 0.014. The metallicity based upon hk and m1 as a function of Hβ is [Fe/H] = -0.03 ± 0.03, effectively solar. While the photometry will be used as a key component within a high-dispersion spectroscopic study of the turnoff and giant branch members, the precise photometry of the red giants reveals that within the very rich red clump, stars known to be single from radial-velocity surveys exhibit higher m1 and hk indices with increasing luminosity, indicating a potential change in the overall metallicity tied to elements other than Fe.

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