2000A&A...358..886B -
Astronomy and Astrophysics, volume 358, 886-896 (2000/6-3)
The extremely young open cluster NGC 6611. Luminosity function and star formation history.
BELIKOV A.N., KHARCHENKO N.V., PISKUNOV A.E. and SCHILBACH E.
Abstract (from CDS):
The stellar content of the young open cluster NGC 6611 was studied on the basis of the data of the Compiled Catalogue published in Belikov et al. (
1999AN....320...27B). Using photometric and proper motion criteria as well as taking into account the cluster structure, we selected 376 probable members down to M
V≃3mag (a limit never reached before) from 2185 catalogue stars. The observed luminosity function was constructed and compared with the theoretical luminosity function computed with the log-normal and power-law IMFs and under the assumption of a non-coeval star formation. From this comparison, the following main conclusions can be drawn, also supported by the analysis of the cluster color-magnitude diagram: (1) the expected H-feature due to the Pre-Main-Sequence - Main-Sequence transition is marginally present in the observed luminosity function at M
V≃1mag (i.e., at the supposed turn-on point of the cluster's CMD); (2) in the mass range [2.1, 85] m
☉ the mass function of cluster stars could be better represented by a power-law IMF with a logarithmic slope Γ=-1.2 than by a log-normal IMF; (3) a cluster age of 6 Myr derived both from the LF and CMD analysis coincides well with present-day findings. A considerable (of the order of the cluster age) spread of individual ages of cluster stars was confirmed, but no evidence of a sequential star formation was found from the data.
Abstract Copyright:
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Journal keyword(s):
Galaxy: open clusters and associations: individual: NGC 6611 - stars: luminosity function, mass function - stars: pre-main sequence
Simbad objects:
2
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