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In the previous papers of this series (Bettoni & Fasano 1993, 1995 and Fasano & Bettoni 1994) we presented data relative to early-type galaxies in several Hickson (1982) and Shakhbazyan (1973-1979) Compact Groups. In this paper we present, for the first time, data on early-type galaxies belonging to 9 Rose (1977) compact groups. The selection criteria of these groups make them more compact than the Hickson and Shakhbazyan groups and, for this reason, the Rose groups constitute a good sample for testing the properties of early-type galaxies in environments of extreme (at least apparent) density. Even if the present sample is not a sizeable one (18 objects), we find that morphological and photometric properties of E and S0 galaxies in the Rose groups are fairly consistent with those of galaxies in the Hickson and Shakhbazyan samples. In particular, there is a lack of very flat objects in the ellipticity distribution.

Morphology of early–type galaxies in compact groups. IV. Rose groups