Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001a%26at...20...81n&link_type=abstract
Astronomical and Astrophysical Transactions, vol. 20, Issue 1, pp.81-84
Astronomy and Astrophysics
Astronomy
Open Clusters, Stellar Evolution, Stellar Dynamics
Scientific paper
Recent accurate wide-field photometry and radial-velocity studies of the open clusters NGC 3680 and IC 4651 show them to be of identical age ( 1.5 Gyr) and metallicity. Their present spatial structure and mass functions show that they have, nevertheless, undergone very different degrees of dynamical evolution: while IC 4651 shows a fully populated main sequence to at least six magnitudes below the turnoff and only weak signs of mass segregation, NGC 3680 is essentially just a surviving cold core of stars in a very narrow mass range, the initial cluster being perhaps a hundred times more massive than now. These twin clusters thus highlight the importance of environmental factors upon the evolution of the stellar population of open clusters.
Andersen Jeppe J.
Nordstrom Birgita
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