Mathematics – Probability
Scientific paper
Aug 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997agab...13..249d&link_type=abstract
Astronomische Gesellschaft Abstract Series, 13, 249
Mathematics
Probability
Large Magellanic Cloud, Star Clusters, Sl 358, Ngc 2006
Scientific paper
The properties of gravitationally bound pairs of star clusters are important for the understanding of formation and evolution of star clusters. Since the probability of tidal capture of one cluster by another one is very small, we can assume that the components of a true binary star cluster have a common origin, thus having the same or at least similar ages and metallicities. In the Magellanic Clouds a large number of pairs was found, exceeding the statistically expected number of chance superpositions. We have started a project to study in detail binary cluster candidates. Here we present first results for the young clusters SL 538 and NGC 2006. This cluster pair is located near the large OB association LH 77 in the supergiant shell LMC 4 in the northwest part of the LMC. By comparing CMDs with isochrones we find similar ages for both clusters. Investigating the stellar density around the clusters we see indications for a stellar bridge between the two components, which may imply that the merger process has begun. We identify Be-star candidates and find the same ratio N(Be)/N(B) for both clusters. Also the slopes of the IMFs are similar and both consistent with a Salpeter IMF. All these results suggest that SL 538 and NGC 2006 constitute a true binary cluster that formed at the same time in the same giant molecular cloud.
Dieball Andrea
Grebel Eva Katharina
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