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Title:
The evolution of galaxies in clusters. III - Photometry of 17 intermediate redshift clusters
Authors:
Butcher, H.; Wells, D. C.; Oemler, A., Jr.
Affiliation:
AA(Kitt Peak National Observatory, Tucson, AZ), AB(Kitt Peak National Observatory, Tucson, AZ)
Publication:
Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 52, July 1983, p. 183-228. (ApJS Homepage)
Publication Date:
07/1983
Category:
Astronomy
Origin:
STI
NASA/STI Keywords:
ASTRONOMICAL PHOTOMETRY, GALACTIC CLUSTERS, RED SHIFT, COLOR, ERROR ANALYSIS, GALACTIC EVOLUTION, MAGNITUDE, SPATIAL DISTRIBUTION, TABLES (DATA)
DOI:
10.1086/190865
Bibliographic Code:
1983ApJS...52..183B

Abstract

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.

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