Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apjs...52..183b&link_type=abstract
Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 52, July 1983, p. 183-228.
Astronomy and Astrophysics
Astrophysics
90
Astronomical Photometry, Galactic Clusters, Red Shift, Color, Error Analysis, Galactic Evolution, Magnitude, Spatial Distribution, Tables (Data)
Scientific paper
Photographic and vidicon photometry of 17 rich galactic clusters with redshifts between 0.17 and 0.39 is presented. Red and blue plates were taken of all of the clusters at the prime focus of the KPNO or CTIO 4 m telescopes. The data reduction and calibration are discussed, and error estimates are made. From internal error indicators, the colors estimated to be accurate to, typically, 0.13 mag at red magnitude of 21. A comparison of object counts in the field regions shows very good agreement with the results of Kron (1980), while suggesting that a previous field galaxy density used by Butcher and Oemler (1978) is slightly too low. This small error is not sufficient to explain the excess of blue objects found by Butcher and Oemler in two distant clusters.
Butcher Harvey
Oemler Augustus Jr.
Wells Donald C.
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