Abstract
view Abstract Citations (21) References (21) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Berkeley 20: an Unusual Old Open Cluster MacMinn, Donn ; Phelps, Randy L. ; Janes, Kenneth A. ; Friel, Eileen D. Abstract We present Charge Couple Device (CCD) VIc photometry for Berkeley 20, a heretofore unstudied old open cluster found approximately 2.5 kpc below the galactic plane. The data was gathered with both the KPNO 2.1 m and the CTIO 0.9 m during 1992 as part of an ongoing survey of old open clusters. Based on the best fits of VandenBerg's 1985 isochrones to the V, V-I color-magnitude diagram (CMD), we estimate an age of 6 Gyr, metallicity of (Fe/H) approximately equals -0.23 dex, (m-M)V approximately equals 15.0 mag and E(V-I) approximately equals 0.16 mag. It is one of the most distant clusters known at 8.4 kpc, and the current galactocentric distance champion at Rgc approximately equals 15.8 kpc. Its great distance below the plane poses difficult questions for any picture of disk formation and structure. There are several good candidates for blue straggler stars. Publication: The Astronomical Journal Pub Date: May 1994 DOI: 10.1086/116989 Bibcode: 1994AJ....107.1806M Keywords: Astronomical Photometry; Brightness Distribution; Color-Magnitude Diagram; Density Distribution; Metallicity; Open Clusters; Calibrating; Charge Coupled Devices; Data Reduction; Images; Optical Filters; Telescopes; Astronomy; OPEN CLUSTERS AND ASSOCIATIONS: INDIVIDUAL: BERKELEY 20 full text sources ADS | data products SIMBAD (47)
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