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Date and Time of the Query: 2019-05-22 T11:54:58 PDT
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For refcode 1990A&A...232..323L:
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Copyright by European Southern Observatory (ESO). Reproduced by permission
1990A&A...232..323L Spectroscopic study of non-cluster early-type galaxies E. Laurikainen Department of Physical Sciences, University of Turku, Tuorla, SF-21500 Piikkio, Finland Received February 6, accepted October 18, 1989 Abstract. Spectroscopic data have been obtained for eight small groups containing early-type galaxies. Their metallicities and velocity dispersions are presented together with a statistical analysis of elliptical galaxies which do not belong to big clusters. The most important result from our analysis is the clear distinction found between isolated and closely interacting ellipticals. Isolated ellipticals have low surface brightness and strong metal lines, and are very red in comparison with interacting ones. We conclude that their origin is different from that of the majority of closely interacting ellipticals. Elliptical galaxies in general display a large dispersion in the L- Mg_2_ and L-{sigma} planes, but this is mainly due to the inclusion of interacting galaxies. This dispersion may be related to the appearance of a young star population in the interacting galaxies. The early-type galaxies of the eight groups studied have rather high metallicities and significant differences were found in their MgH and CN band strengths, strong "metals" being associated with high Fe I (+CN) strength due to increased CN-abundance. Key words: galaxies: ellipticals
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