Abstract
Infrared photometry is presented for 21 galaxies that are spectroscopically confirmed members of the Butcher–Oemler cluster C1 0024 + 1654 at z=0.39. These data are combined with optical CCD photometry and transformed to produce rest-frame UBVK colors. The distribution of colors in the (U–V)/(V–K) plane is analyzed. The 11 ‘red’ galaxies have colours that are broadly similar to those of nearby elliptical galaxies. All but one of the 10 ‘blue’ galaxies have the colorus of nearby spiral galaxies, including one Im-type galaxy, and other interpretations, e.g. a young age, may be discounted. The (V–K) colour of the remaining ‘blue’ galaxy, however, suggests the presence of a substantial intermediate age (~1 Gyr) stellar population and, since this is also the only galaxy with optical Balmer absorption but no [O II] 3727 emission, it is probably an example of an old starburst galaxy not thought hitherto to exist in this cluster. It is shown that there is a color-magnitude relation for the ‘red’ galaxies in (V–K)/K but that the colours are systematically redder than those found in Coma ellipticals and are more similar to those found in Virgo.
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