CCD Photometry of Galactic Globular Clusters. V. NGC 2808 | Zendy

A. R. Walker | Zendy

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CCD Photometry of Galactic Globular Clusters. V. NGC 2808

Author(s) -

A. R. Walker

Publication year - 1999

Publication title -

the astronomical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.61

H-Index - 271

eISSN - 1538-3881

pISSN - 0004-6256

DOI - 10.1086/300947

Subject(s) - globular cluster , photometry (optics) , physics , astrophysics , metallicity , horizontal branch , astronomy , star cluster , blue straggler , cluster (spacecraft) , galaxy , stars , computer science , programming language

We present a deep color magnitude diagram for the galactic globular clusterNGC 2808 (C0911-646), reaching 3 magnitudes below the main sequence turnoff. Aset of local photometric standards are provided, and the mean cluster reddeningand metallicity are constrained using several photometric techniques. Theunusual horizontal branch morphology discovered by Sosin et al. (1997, ApJ,480, L35) is confirmed. No significant radial population gradients areidentified to within the limits of the data. We investigate the redwards colorspread on the main sequemce found by Ferraro et al. (1997, A&A, 327, 598) in afield centered 6.3 arcmin from the cluster center, attributed to binaries. Weconclude that the spread is in the most part due to a non-Gaussian distributionof photometric errors about the main sequence ridgeline.Comment: 20 pages, 7 figures, A.J. accepte

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